WSR 22-02-040
PROPOSED RULES
BUILDING CODE COUNCIL
[Filed December 30, 2021, 10:05 a.m.]
Original Notice.
Preproposal statement of inquiry was filed as WSR 21-07-134.
Title of Rule and Other Identifying Information: Chapter 51-50 WAC, Adoption and amendment of the 2021 International Building Code (IBC).
Hearing Location(s): On February 11, 2022, at 10:00 [a.m.], and March 11, 2022, at 10:00 [a.m.] virtual meeting - Zoom. In response to the governor's emergency proclamation there will not be a physical location. Please access the meeting via Zoom or conference phone provided in the agenda.
Date of Intended Adoption: April 15, 2022.
Submit Written Comments to: State Building Code Council (SBCC), 1500 Jefferson Street S.E., Olympia, WA 98504, email sbcc@des.wa.gov, by March 4, 2022.
Assistance for Persons with Disabilities: Contact Annette Haworth, phone 360-407-3255, email sbcc@des.wa.gov, by February 4, 2022.
Purpose of the Proposal and Its Anticipated Effects, Including Any Changes in Existing Rules: The proposed rule adopts the 2021 edition of IBC, published by the International Code Council (ICC), with state amendments to incorporate proposed changes as adopted by SBCC. The rules will provide increased clarity and life safety measures for building construction in Washington state.
ATTACHMENT A: SUMMARY OF PROPOSED CHANGES
2021 IBC Amendments to Chapter 51-50 WAC
WAC
Section
Changes in 2021
Rationale/Discussion
WAC 51-50-003
003
Change 2018 to 2021.
Editorial change
WAC 51-50-005
005
Change reference from 2009 A117.1 to 2017.
ICC A117.1-2017 is the most current version.
WAC 51-50-007
007
Change 2015 to 2021.
2021 IEBC is the most current code.
WAC 51-50-008
008
Replaces February 1, 2021, with July 1, 2023.
July 1, 2023, is the effective date for all 2021 codes.
WAC 51-50-009
009
Remove existing language and reserve
WAC 51-50-009.
The existing language is relocated in Chapters 2 and 4 (Section 430); there is no change in regulatory effect.
WAC 51-50-0110
110.3.5 through
110.3.12.1
Remove the state amendment and reserve
WAC 51-50-0110.
The existing amendment is no longer needed; it is addressed in the model code.
WAC 51-50-0202
Definitions
AUTOMATIC LOAD MANAGEMENT SYSTEM (ALMS). New definition.
The term is used in the new proposal in Section 429.
COMPOST.
Relocated from WAC 51-50-009.
The existing language is relocated in Chapters 2 and 4 (Section 430); there is no change in regulatory effect.
ELECTRIC VEHICLE (EV) CAPABLE PARKING SPACE. New definition.
The term is used in the new proposal in Section 429.
ELECTRIC VEHICLE (EV) CHARGER.
The term is used in the new proposal in Section 429.
ELECTRIC VEHICLE (EV) READY PARKING SPACE. New definition.
The term is used in the new proposal in Section 429.
ELECTRIC VEHICLE SUPPLY EQUIPMENT (EVSE). New definition.
The term is used in the new proposal in Section 429.
HIGH-RISE BUILDING.
New definition.
Corrects a previous ambiguity by adding an occupied roof with an occupant load of 50 or more.
LOFT.
New definition.
The term is used in the new proposal in
Sections 420.14, 505.1, 907.2.11.1, 907.2.11.2, 1011.15, 1011.16, 1015.2, 1015.3.
MASS TIMBER. Remove existing definition.
Addressed in the model code.
NIGHTCLUB. Modifying the existing definition. The reference to 2006 IBC regarding Group A-2 is proposed for remove [removal].
The A-2 occupancy is addressed in the 2021 IBC (as well as in all other codes after 2006); there is no need for a reference to an old code to be maintained.
NONCOMBUSTABLE PROTECTION (For MASS TIMBER). Remove existing definition.
The existing definition is no longer needed; it is addressed in the model code.
RECYCLED MATERIALS.
Relocated from WAC 51-50-009.
The existing language is relocated in Chapters 2 and 4 (Section 430); there is no change in regulatory effect.
WALL, LOAD BEARING.
Remove existing definition.
The existing definition is no longer needed; it is addressed in the model code.
WAC 51-50-0306
306.2
Add: Energy storage systems (ESS) in dedicated use buildings.
Add: Water/sewer treatment facilities.
Incorporates changes in the model code.
WAC 51-50-0308
308.1.1
Remove defined terms.
Intended to match the model code format.
308.2
Modify existing amendment.
Incorporates changes in the model code.
WAC 51-50-0309
309.1
Modify existing amendment.
Incorporates changes in the model code.
WAC 51-50-0310
310.3
Reformat existing language.
Intended to match the format in the model code. There is no intended change in regulatory effect.
WAC 51-50-0403
403.3.2
Remove existing amendment.
Addressed in the model code.
403.5.4
Referenced sections renumbering.
Incorporates renumbering in the model code.
WAC 51-50-0405
405.7.2
• New WAC number for existing amendment.
• Referenced section renumbering.
WAC number and section title were previously omitted. The proposal also incorporates renumbering in the model code.
WAC 51-50-0407 
407.4.4.3
Remove the state amendment and save
WAC 51-50-0407 as reserved.
The existing amendment (deletes the exception allowing 125 feet travel distance) was intended to avoid conflicts with the federal requirements. The model code is modified to reflect recent changes in the federal rules; there is no longer need for the existing amendment.
WAC 51-50-0412 
412.7.3
Modify existing amendment.
Incorporates changes in the model code.
WAC 51-50-0420  
420
• Sections 420.11, 420.11.1, 420.11.2, 420.11.3, 420.11.4, 420.11.5, 420.11.6, and 420.12 are renumbered.
• Section references in Section 420.14 (as renumbered), Item 9, are renumbered.
Modifications are intended to incorporate section renumbering in the model code.
420.14
Add new Section 420.14 (Lofts) with subsequent subsections (420.14.1, 420.14.2, 420.14.3, 420.14.4, 420.14.4.1, 420.14.5).
Introduces "lofts" into the IBC as WA amendment. The concept is taken from Section R327 of the IRC, as amended. Lofts have been used in jurisdictions for years to put "extra" space to use. However, there is nothing in the code that regulates them. This proposal is intended to provide a reasonable balance between flexibility and safety for lofts.
WAC 51-50-0429
429
Replace the existing requirements for EV infrastructure with a new proposal.
Statutory mandate pursuant to HB 1287.
New
WAC 51-50-0430
430
Relocation.
The existing language in WAC 51-50-009 is relocated in Chapters 2 and 4; no change in regulatory effect.
WAC 51-50-0503 
503.1.4
Remove existing amendment.
Addressed in the model code.
503.1.4.1
New section addressing enclosures of occupied roof areas. The new amendment adds Exception 2 - addressing the high-rise buildings.
The current limit on the guard height was based on fire department access to the roof. Once the roof deck is higher than fire ladder access, there is no longer justification for this limitation. There have been concerns that higher guards are needed on higher roofs to prevent people from jumping off the roof and/or to allow for wind breaks to limit items blowing off the roof deck and falling on people below. This proposal addresses both concerns.
503.1.4.2
New section.
See Section 1015.2.
WAC 51-50-0504
504.4.1
Referenced section renumbering.
Incorporates changes in the model code (renumbering).
WAC 51-50-0505
505.1
New section.
Adds "lofts" as an exception reference section for correlation. See rationale for Section 420.14.
WAC 51-50-0506
Table 506.2
Remove existing amendment and reserve 
WAC 51-50-0506.
The existing amendment is no longer needed; it is addressed in the model code.
WAC 51-50-0508
508.4.4.1
Remove existing amendment.
Addressed in the model code.
508.5.1
New section. Delete Item 4 from the model code language.
Removes an unenforceable limitation. Once the building permit is issued, the code official does not have the ability to restrict the number of people in a private residential dwelling unit.
WAC 51-50-0509
509.4.1.1
Remove existing amendment.
Addressed in the model code.
WAC 51-50-0510
510.2
• Incorporates changes in the model code.
• Corrects errors in the existing amendment (Exception 4 is Item 4 in the model code).
• Amends Items 5 and 7.
Eliminates the Group A 299 occupant load limitation in its entirety and let the overall provisions found in the IBC dictate the design of Group A buildings or buildings with Group A occupancy constructed over horizontal assembly.
510.5
Remove existing amendment.
Addressed in the model code.
WAC 51-50-0601
Table 601
Remove existing amendment and reserve 
WAC 51-50-0601.
The existing amendment is no longer needed; it is addressed in the model code.
WAC 51-50-0602
Table 602
602.4
Remove existing amendments in Table 602 and Sections 602.4, 602.4.1, 602.4.1.1, 602.4.1.2, 602.4.1.2.1, 602.4.1.3, 602.4.1.4, 602.4.1.5, 602.4.1.6, 602.4.2, 602.4.2.1, 602.4.2.2, 602.4.2.2.1, 602.4.2.2.3, 602.4.2.2.4, 602.4.2.5, 602.4.2.6, 602.4.3, 602.4.3.1, 602.4.3.2, 602.4.3.3, 602.4.3.4, 602.4.3.5, 602.4.3.6, 602.4.4, 602.4.4.1, and 602.4.4.2.
The existing amendments are no longer needed; all are addressed in the model code.
602.4.2.2.2
Modify existing amendments. The proposed increase of allowable unprotected area on the ceiling from 20 percent to 100 percent is consistent with the recently completed research conducted at the Research Institute of Sweden (RISE).
The RISE fire tests demonstrate that the proposed
amounts of unprotected areas on the ceiling and walls, as a function of floor area, can be safely implemented while still achieving the performance objectives specified by the ICC Tall Wood Building Ad-Hoc Committee in the development of the tall building mass timber provisions in the 2021 I-codes. (See proposal # 21-GP1-87 for detailed rationale.)
602.4.2.2.4
602.4.2.3
Modify existing amendment.
Intended to address a conflict. For Type IV-B construction, the current code requires the underside of mass timber floor assemblies to be protected in accordance with the provisions for Type IV-A construction (the last sentence in Section 602.4.2.3 points to Section 602.4.1.2). However, Section 602.4.1.2 does not permit exposed mass timber. This conflicts with Section 602.4.2.2.2, which allows some limited exposed mass timber. This proposal eliminates the conflict by clarifying the reference to Type IV-A construction does not apply to the unprotected portions of mass timber permitted for Type IV-B construction.
602.4.4.3
New section; the amendment is in Item 3.
Adequately conveys the intent of the third protection alternative. Only combustible surfaces in concealed spaces need to be protected. If a concealed space is created by furring out with steel studs, for instance, only the heavy timber surfaces would need to be sheathed with 5/8-inch Type X gypsum board, not the steel studs.
WAC 51-50-0603
603.1
Remove existing amendment and reserve 
WAC 51-50-0603.
Technical advisory group (TAG) recommended remove [removal] of the existing amendment; the reference to Section 2304.10.5 is unnecessary.
WAC 51-50-0703
703.8
703.9
Remove existing amendments and reserve 
WAC 51-50-0703.
The existing amendment is not needed; it is addressed in the model code.
WAC 51-50-0704
704.6.1
Replace the existing amendment with a new amendment. The proposed amendment modifies the new model code language in Section 704.6.1.  
Intended to clarify the application of the new code section that was approved for 2021 IBC. As currently written, secondary steel attachment is not a defined term in the code and may be confused with the definition of secondary structural members in IBC Chapter 2. The proposed language is consistent with FS11-21 (attached to the proposal), which was approved by the ICC Fire Safety Committee for inclusion in the 2024 IBC.
WAC 51-50-0705
705
Modify the title by deleting "and projections."
Title is corrected to align with the model code.
705.1
Remove existing amendment.
Addressed in the model code.
705.2.4
Renumbered to 705.2.5.
Incorporates renumbering in the model code.
705.2.5
Remove existing amendment.
Addressed in the model code.
WAC 51-50-0706
706.3
New section.
Type III and IV buildings are required to have fire walls made of approved non-combustible materials. Limiting the make-up of fire walls to non-combustible materials can result in problems for taller III and IV buildings. Material shrinkage and differential vertical shrinkage between dissimilar non-combustible fire wall materials and the combustible building bearing wall, may cause long term damage to the fire wall. Testing supporting the mass timber provisions recently approved for IBC suggest a different approach to these fire walls.
706.4
New section.
Table 706.4
New table.
706.6.1
Remove existing amendment.
Addressed in the model code.
WAC 51-50-0707
707.4
707.5
Remove existing amendments and reserve 
WAC 51-50-0707.
The model code addresses all existing amendments.
WAC 51-50-0713
713.13.4
Remove existing amendment.
Addressed in the model code.
WAC 51-50-0717
717
717.5.2 717.5.4
Remove existing amendments and reserve 
WAC 51-50-0717.
The model code addresses all existing amendments.
WAC 51-50-0718
718.2.1
Remove existing amendment and reserve 
WAC 51-50-0718.
The existing amendment is not needed; it is addressed in the model code.
WAC 51-50-0722
722.7 722.7.1
Remove existing amendments.
The model code addresses all existing amendments.
Tables 722.7.1(1)
722.7.1(2)
722.7.2
722.7.2.1
 
 
WAC 51-50-0803
803.3
Remove existing amendment and reserve 
WAC 51-50-0803.
The existing amendment is not needed; it is addressed in the model code.
WAC 51-50-0902
 
Delete Section 902.
Editorial modification to match WAC format.
WAC 51-50-0903
903.2.1.3
New section. Adds an exception to the model code pertaining to fixed guideway transit and passenger rail system stations.
Intended to correlate the IBC/International fire code (IFC) requirements for fire protection to NFPA 130 requirements. The primary purpose is to clarify the requirements for fire protection at open stations. (See proposal 21-GP1-67 for detailed rationale.)
903.2.1.6
New section.
This is an existing amendment, currently in IFC. The amendment is proposed for inclusion into IBC for consistency with IFC.
903.2.3
Renumbering of referenced section.
Incorporates renumbering in the model code.
903.2.6.1
Renumbering of referenced section.
Incorporates renumbering in the model code.
903.2.7
Remove existing amendment.
Addressed in the model code.
903.2.9.3
Remove existing amendment.
Addressed in the model code.
903.2.11.1.3
New section.
This is an existing amendment, currently in the IFC. The amendment is proposed for inclusion into the IBC for consistency with the IFC.
903.3.1.2
New section.
Undoes a change that was made to the 2021 IFC and IBC (FS117-18), returning the language in the section to the 2018 text, and aligns the code with the scoping provisions of NFPA 13R. The 2021 change limits the applicability of NFPA 13R systems for podium buildings, triggering a requirement for a full NFPA 13 system in more buildings. If adopted by SBCC, the 2021 IFC/IBC requirement would decrease affordability for residential construction, since a full NFPA 13 system would be required in shorter buildings.
WAC 51-50-0907
907.2.3
Modify existing amendment.
Incorporates changes in the model code.
907.2.11.1
907.2.11.2
New sections. Modify the model code by adding a reference to Section 420.14.
See Rationale for Section 420.14.
907.5.2.1.2
Modify existing amendment.
Incorporates changes in the model code.
WAC 51-50-0908
 
Delete Section 908.
Editorial modification to match WAC format.
WAC 51-50-0911
911.1.2
New section. Incorporates more restrictive requirement for the fire command center separation (two-hour instead of one-hour separation).
This is an existing amendment in the IFC, which is proposed as an amendment in the IBC. The proposal provides consistency between IFC and IBC.
WAC 51-50-0913
913.2.1
Renumbering of referenced section.
Incorporates renumbering in NFPA 20.
WAC 51-50-0915
915.1
915.2
Remove existing amendments in Sections 915.1, 915.1.2, 915.1.3, 915.1.4, 915.1.5, 915.1.6, 915.2, 915.2.1, 915.2.2.
The model code addresses all existing amendments.
WAC 51-50-0918
918.1
New WAC section. The modification to the model code revises the terms used in this section.
Intended to align the terminology being used by industry. This is also proposed code change F32-21 in Group A proposed changes to the 2024 IFC and 2024 IBC. It was approved as submitted by the committee.
WAC 51-50-1003
1003.7
New WAC section. Adds Exception 2 to the model code and refers to Section 3116 for escalators used as a means of egress for fixed transit and passenger rail systems.
See rationale for Section 3116.
 
Table 1004.5
Add fixed guideway transit and passenger rail systems; platform, and concourse/lobby.
See rationale for Section 3116.
WAC 51-50-1005
1005.1
New section adds Exception 2 to the model code; refers to Section 3116 for escalators used as means of egress for fixed transit/passenger rail systems.
See rationale for Section 3116.
WAC 51-50-1006
1006.2.1
Modify existing amendment. Adds Exception 4 to the model code and refers to Section 3116 for common path of travel for fixed transit and passenger rail system stations.
See rationale for Section 3116.
1006.2.1.1
New section. Adds an exception to the model code addressing the number of required exits for fixed transit and passenger rail systems.
See rationale for Section 3116.
1006.2.2.4
Remove existing amendment.
This section is no longer in the model code; there is no need for this amendment.
1006.2.2.7
Remove existing amendment.
The existing amendment and the new model code section 1006.2.2.4 have the same regulatory effect. New Section 1006.2.2.4 refers to NFPA 70, Articles 110.26 and 110.33 for electrical equipment rated 1,000 volts or less, and more than 1,000 volts. The existing amendment in 1006.2.2.7 provides the same requirements, but it is more specific, using language from NFPA 70, Articles 110.26 and 110.33.
1006.3.3
Renumbered to 1006.3.4; renumbering of referenced sections.
Incorporates renumbering in the model code.
Tables 1006.3.3(1)
1006.3.3(2)
Remove existing amendment.
Addressed in the model code.
WAC 51-50-1009
1009.1
Renumber referenced section.
Incorporates renumbering in the model code.
1009.2.1
Remove existing amendment.
Addressed in the model code.
1009.8.1
Modify existing amendment.
Modified to incorporate the model code new language.
WAC 51-50-10100
1010.1.9.4
Delete existing amendment.
Relocated to Section 1010.2.4 to align with the model code renumbering. (See rationale for Section 1010.2.4.)
1010.1.9.7
Delete existing amendment.
Relocated to Section 1010.2.14 to align with the model code renumbering. (See rationale for 1010.2.14.)
1010.1.10
Remove existing amendment.
Addressed in the model code Section 1010.2.9.
1010.1.10.3
Remove existing amendment.
Addressed in the new model code section 1010.2.9.2.
1010.2.4
Relocate existing amendment, as modified.
The existing amendment is currently in
Section 1010.1.9.4.
The existing amendment is formally removed. The model code is adopted without Item 2; Item 2 is replaced with the existing amendment currently in Section 1010.1.9.4, Item 7. The existing amendment in Section 1010.1.9.4, Item 8, is not needed because it is addressed by the model code. 
1010.2.14
Relocate existing amendment, as modified.
The existing amendment is currently in
Section 1010.1.9.7.
The existing amendment is formally removed. The model code is adopted as amended, with the existing amendments in Item 6 and Exception 1. The existing amendments in the first paragraph and Items 1, 2, and 4 are no longer needed; addressed by the model code.
1010.3.4.1
Adds a new section to the model code addressing fixed transit and passenger rail systems.
See rationale for Section 3116.
WAC 51-50-1011
1011.7
Remove existing amendment.
Addressed in the model code.
1011.1
New section. The amendment adds an exception to the model code addressing lofts.
See rationale for Section 420.14.
1011.17
Remove existing amendment.
Existing amendment is replaced with Section 1011.1. (See Rationale for Section 420.14.)
WAC 51-50-1012
1012.1
Modify existing amendment.
Incorporates model code changes.
WAC 51-50-1014
1014.2
New section in WAC; new section in the model code.
The code does not currently regulate the lateral distance that a handrail can be located away from the edge of the walking surface of a stair, ramp or aisle. If a designer wanted to locate a handrail 24 inches away from the walking surface, there is currently no code provision to prevent that. Most building officials would not permit that design, but there is no code to support them. The data provided as part of this proposal helps justifications for limiting the lateral distance of the handrail to be not more than six inches from the edge of the walking surface. This code change is needed to ensure handrails will be located close enough to the edge of the walking surface to provide adequate support for pedestrians with limited reach capabilities.
1014.2.1
New section in WAC; renumbers Section 1014.2 to 1014.2.1.
1014.2.2
New section in WAC; new section in the model code.
1014.8
New section in WAC; modifies the model code.
1014.3
New section in WAC; new section in model code.
The same as 1014.2.2; research.
WAC 51-50-1015
1015.2
New section. The new amendment requires guards to be provided at the perimeter of the occupied portions of an occupied roof, and provides two Exceptions (Exception 9 and exception 10). In addition, the new amendment provides a reference to Section 420.14 pertaining to lofts.
There are many cases where the design of an occupied roof includes only a portion of the entire roof area. Occupied portions of roofs are typically elevated 18 inches or less above the adjacent unoccupied areas of the roof; therefore, no guard is currently required for these areas. This issue is regularly debated due to the lack of regulatory authority to require the guard in this design scenario. This proposal will eliminate or drastically reduce the potential for kids or adults who may be inebriated, from falling over the edge of a roof even if the occupied portion of the roof is some distance away from the roof edge. (See also Rationale for Section 420.14.)
1015.3
New section. Adds Exception 4 to the model code pertaining to lofts.
See Rationale for Section 420.1.4.
WAC 51-50-10170
Table 1017.2
New amendment adds Section 3116 to footnote (a).
See rationale for Section 3116.
WAC 51-50-1019
1019.3
Modify existing amendment.
Incorporates new model code language.
WAC 51-50-1020
1020.4
Remove existing amendment.
Addressed in the model code.
1020.5
Modify existing amendment.
Incorporates new model code language.
WAC 51-50-1023
1023.2
1023.5
Remove existing amendment.
The existing amendment is not needed; it is addressed in the model code.
1023.12
Section 21023.11 is renumbered to 1023.12.
Incorporates changes in the model code.
WAC 51-50-1024
1024.9
Remove existing amendment and reserve 
WAC 51-50-1024.
The existing amendment is not needed; it is addressed in the model code.
WAC 51-50-1030
1030.6
Remove existing amendment and reserve 
WAC 51-50-1030.
The existing amendment is not needed; it is addressed in the model code.
WAC 51-50-1101
1101.2.1
Remove existing amendment.
The requirement for clear width of accessible routes in 2009 American National Standards Institute (ANSI) A117.1 and 2010 ADA Standards is 36 inches. The existing WA amendment requires 44 inches, and it is [a] more stringent requirement for exterior routes of travel. In 2017 ANSI, the language in Section 403.5 is modified; the requirements are 36 inches for interior accessible routes and 48 inches for exterior accessible route. IBC TAG recommended remove [removal] of the existing amendment.
1101.2.2
Modify existing amendment.
The modifications incorporate changes in 2017 ANSI. In addition, the existing exception is proposed for remove [removal]. ANSI Section 404.2 is titled "Manual doors, doorways and manual gates" and does not address automatic doors. There is no need for the existing exception because Section 404.3 is specific to automatic doors.
1101.2.3
Remove existing amendment.
Addressed in 2017 ANSI.
1101.2.4
Modify referenced section from 606.7 to 603.6.
Keep the existing amendment as modified to provide the correct reference.
WAC 51-50-1105
1105.1.8
Table 1105.1.8
Remove existing amendment and reserve 
WAC 51-50-1105.
The existing amendment is not needed; it is addressed in the model code.
WAC 51-50-1106
1106.7
Renumber Section 1106.6 to 1106.7.
Incorporates renumbering in the model code.
WAC 51-50-1107
1107
Add new Section 1107 Motor-vehicle related facilities. The existing Section 1107 Dwelling units and sleeping units is renumbered to 1108; Sections 1107.5, 1107.5.1, 1107.5.1.1, 1107.5.1.2, 1107.5.1.3, 1107.5.2, 1107.5.2.1, 1107.5.4, 1107.6.2.2.1, 1107.6.2.3 are removed.
Incorporates new model code section.
1107.2
New section. Modifies the model code exception by deleting R-2 and R-4 occupancy groups.
The exception conflicts with an existing amendment in IBC Section 429.5, which requires at least one accessible parking space to be served by EV charging infrastructure if the infrastructure is required (including for R-2 occupancies). R-4 occupancy group is deleted because it is not adopted in Washington.
1107.2.1
Add a reference to IBC Section 429.4.
Provisions for EV charging are located in Section 429; Section 429.4 addresses accessible EV charging spaces.
1107.5
Remove existing amendments in Sections 1107.5, 1107.5.1, 1107.5.1.1, 1107.5.1.2, 1107.5.1.3, 1107.5.2, 1107.5.2.1, 1107.5.4.
The existing amendments are not needed; they are addressed in the model code.
1107.6.2.2.1
Relocated/renumbered to 1108.6.2.2.1.
 
1107.6.2.3
Remove existing amendment.
Addressed in the model code.
WAC 51-50-1108
1108
New WAC section with existing title. Dwelling units and sleeping units are currently in Section 1107.
WAC renumbering to align with renumbering in the model code.
1108.6.2.2.1
Renumber existing amendment currently in Section 1107.6.2.2.1; renumber a section reference in the text.
The renumbering is necessary due to renumbering in the model code.
WAC 51-50-1109
1109.2
Remove existing amendments and reserve 
WAC 51-50-1109
(1109.2.4, 1109.2.4.1, 1109.2.4.2, 1109.4.2.2.1 [1109.2.4.2.1], 1109.2.4.2.2, 1109.2.4.2.3, 1109.2.4.3, 1109.2.4.4, 1109.2.4.5, 1109.2.4.6, 1109.2.5, 1109.2.5.1, 1109.2.5.2, 1109.2.5.3, 1109.2.5.3.1, 1109.2.5.3.2, 1109.2.5.4, 1109.2.5.5, 1109.2.5.6, 1109.2.5.7, 1109.2.5.8, 1109.2.5.9).
Section 1109.2 is renumbered to 1110.2 to align with model code renumbering.
1109.5.1
 
Section 1109.5.1 is renumbered to 1110.5.1 to align with model code renumbering.
WAC 51-50-1110
1110.2 1110.5.1
New WAC section with existing title. "Other features and facilities" is currently in WAC 51-50-1109. Sections 1110.2 and 1110.5.1 are renumbered (currently 1109.2 and 1109.5.1).
Modify the existing amendment in Item 3.
The renumbering is necessary due to renumbering in the model code.
The current amendment and the proposed modification will ensure that the number of accessible toilet or bathing fixtures is not reduced when the required toilet and bathing facilities are
designed and constructed as gender-neutral.
WAC 51-50-1202
1202.2
1202.2.1
Section 1202.2 Attic spaces is renumbered to 1202.2.1 and retitled to Ventilated attics and rafter spaces.
Incorporates changes in the model code.
1202.7.1
Renumber section references.
Editorial corrections due to errors.
1202.7.1.1
1202.7.1.2
1202.7.2.2
1202.7.2.3
1202.7.3.1
WAC 51-50-1204
1204.1
Remove existing amendments and reserve 
WAC 51-50-1204.
The existing amendments are not needed; duplicate existing amendments in Section 1203.
1204.2.1
1204.2.2
1204.2.3
WAC 51-50-1206
1206.1
Remove existing amendment and reserve 
WAC 51-50-1206.
The existing amendment is not needed; it is addressed in the model code.
WAC 51-50-1207
1207.4
Remove existing amendment and reserve 
WAC 51-50-1207.
The existing amendment is not needed; it is addressed in the model code.
WAC 51-50-1208
1208.3
New section; adds requirements for dwelling unit size.
The code, as currently written, can be interpreted to allow a one-bedroom unit to be smaller than an efficiency dwelling unit. This change makes it clear that a dwelling unit and efficiency dwelling unit are subject to the same size limitations. It also clarifies that sleeping units are subject to the same minimum size requirements as habitable rooms in dwelling units.
1208.4
New section; modifies the requirements for room area.
1208.5
New section; modifies the requirements for efficiency dwelling units.
WAC 51-50-1209
1209.3.1
Remove existing amendments and reserve 
WAC 51-50-1209.
The existing amendments are relocated to
WAC 51-50-1210.
1209.3.2
1210.3.1
Relocated from WAC 51-50-1209.
 
1210.3.2
WAC 51-50-1402
1402.2
New WAC with new section.
Relocated from WAC 51-50-1403.
WAC 51-50-1403
1403.2
Remove existing amendments and reserve 
WAC 51-50-1403.
Relocated to WAC 51-50-1402.
WAC 51-50-1405
 
Delete Section 1405.
Editorial to match the WAC format.
WAC 51-50-2900
 
Delete "Chapter 29 Plumbing systems" and reserve WAC 51-50-2900.
Editorial; assign WAC numbers to all sections instead of one WAC number for Chapter 29.
WAC 51-50-2901
 
New WAC number.
 
2901.1
Modify the existing amendment.
The existing amendment was adopted in 2012 and it was consistent with the model code at that time. The model code was modified in 2015 and 2018, but the state amendment was never modified. This modification is for consistency with the new model code.
2901.3
Renumber section reference.
Incorporates renumbering in the model code Chapter 31.
WAC 51-50-2902
 
New WAC number.
 
2902.1.4
Remove existing amendment.
No longer needed; the model code addresses (and expands) the state language in Section 2902.1.2.
2902.2
Modify existing amendment.
The existing amendment is modified to align with the model code language. Exception 4 was added in 2018 IBC but was never added to the existing state amendment. This modification corrects this oversight. Exception 7, as shown, is new in 2021 IBC and is added to the existing amendment.
2902.2.1
Remove existing amendment.
Addressed in the model code.
2902.3
Modify existing amendment.
The first paragraph is language from 2015 IBC; it was never updated to align with the 2018 IBC. The modification corrects this oversight. Exception 1 is also modified for consistency with the model code.
2902.3.3
Modify existing amendment.
Exception 1 is an existing amendment that matches the new Exception 2. The modification incorporates the model code language.
2902.6
New section; the text clarifies Section 2902.6 addressing small appliances is not adopted.
To eliminate confusion between Washington State Amendment 2902.5.1 and IBC Section 2902.6. IBC Section 2902.6 requires drinking fountains for occupant loads greater than 15. It relies on IBC Table 2902.1 for the scoping of the number of required drinking fountains.
2902.7
Renumber to 2902.8.
Incorporates section renumbering in the model code.
2902.8
Renumber to 2902.9.
WAC 51-50-3004 
 
Delete Section 3004.
Editorial to match the WAC format.
WAC 51-50-3101 
3101.1
Modify existing amendment.
Align with the model code formatting.
WAC 51-50-3102 
3102.3
3102.6.1.1
Remove existing amendments and reserve 
WAC 51-50-3102.
Existing amendments are addressed in the model code.
WAC 51-50-3103 
3103.1
Modify existing amendment.
Incorporates language from the model code (adds the phrase "special event and umbrella structures"). For clarity, the existing amendment is shown with strikeout and the modified version is underlined.
WAC 51-50-3114 
3114
3114.1
Remove existing amendments and reserve 
WAC 51-50-3114.
Section 3114 is relocated to WAC 51-50-3116 (new WAC number); Section 3114.1 is proposed for remove [removal].
WAC 51-50-3116 
3116
3116.1
3116.2
Section 3116 is relocated from WAC 51-50-3114; the code language currently in 3114 is given a section number (3116.1) and a title (Construction). New Section 3116.2 is proposed to summarize modifications to NFPA 130. The existing Section 3114.1 is removed.
Renumbering is necessary because new sections were added to the model code. NFPA 130 is modified to align with the most current version. The new proposal in Section 3116.2 is drawn from NFPA 130 amendments by the City of Bellevue and the City of Seattle for means of egress for light rail stations. The intent is to provide clarity for more consistent application of the IBC and NFPA 130 in the future as light rail service expands and extends into new jurisdictions. Confusion on how the codes correlate can result in schedule delay and additional work for the agency and the authority having jurisdiction. (See proposal # 21-GP1-66 for rationale.)
WAC 51-50-3304
3304.2
Remove existing amendments and reserve 
WAC 51-50-3304.
Relocated to WAC 51-50-3314. (New WAC number.)
WAC 51-50-3314
3314
3314.1
New WAC number; Section 3304 Site work is renumbered to 3314 and retitled to "Fire watch during construction."
Reorganization and retitling is necessary due to the model code changes.
WAC 51-50-3401
 
Delete Section 3401.
Editorial to match WAC format.
WAC 51-50-3404
 
Delete Section 3404.
Editorial to match WAC format.
WAC 51-50-3410 
 
Delete Section 3410.
Editorial to match WAC format.
WAC 51-50-3411 
 
Delete Section 3411.
Editorial to match WAC format.
WAC 51-50-3500 
Chapter 35
Delete ANSI/APA PRG-320-18.
Change NFPA 130-17 to NFPA 130-20.
No longer needed; addressed in the model code.
Updated to the most current standard.
WAC 51-50-4700
Appendix D
Remove existing amendments, use
WAC 51-50-4700 for proposed Appendix P.
The existing amendment is no longer needed; it is addressed in the model code.
WAC 51-50-4700
Appendix P
New appendix addressing construction and demolition material management. The appendix will be effective only if adopted by a local ordinance.
The optional appendix is intended to reduce the amount of construction and demolition waste that goes to a landfill after leaving a construction site. For jurisdictions where material management is a priority, this language helps to increase the amount of material that is salvaged for reuse or recycled [recycling]. In partnership with this proposed appendix are two forms, a Salvage Assessment and Waste Diversion Report. (See proposal # 21-GP1-116 for detailed rationale.)
Note:
Those not listed on the table above remain as adopted in 2018 IBC.
Reasons Supporting Proposal: RCW 19.27.031, 19.27.074, and 19.27.540.
Statutory Authority for Adoption: RCW 19.27.031, 19.27.074, and 19.27.540.
Statute Being Implemented: RCW 19.27.031, 19.27.074, and 19.27.540.
Rule is not necessitated by federal law, federal or state court decision.
Name of Proponent: SBCC, governmental.
Name of Agency Personnel Responsible for Drafting and Implementation: Stoyan Bumbalov, 1500 Jefferson Street S.E., Olympia, WA 98504, 360-407-9277; and Enforcement: Local jurisdictions having authority.
A school district fiscal impact statement is not required under RCW 28A.305.135.
A cost-benefit analysis is required under RCW 34.05.328. A preliminary cost-benefit analysis may be obtained by contacting Stoyan Bumbalov, 1500 Jefferson Street S.E., Olympia, WA 98504, phone 360-407-9277, email sbcc@des.wa.gov.
This rule proposal, or portions of the proposal, is exempt from requirements of the Regulatory Fairness Act because the proposal:
Is exempt under RCW 19.85.025(3) as the rules are adopting or incorporating by reference without material change federal statutes or regulations, Washington state statutes, rules of other Washington state agencies, shoreline master programs other than those programs governing shorelines of statewide significance, or, as referenced by Washington state law, national consensus codes that generally establish industry standards, if the material adopted or incorporated regulates the same subject matter and conduct as the adopting or incorporating rule; and rule content is explicitly and specifically dictated by statute.
The proposed rule does impose more-than-minor costs on businesses. There are costs imposed by the proposed rule, but the costs do not fall disproportionately on small businesses. The rule will not affect the distribution of impacted work, whether by small businesses or not, doing the work. The rule does not affect employment, reporting or record keeping.
Small Business Economic Impact Statement
Description: SBCC is filing a proposed rule to adopt the 2021 edition of the International Building Code (IBC), nonstructural provisions (chapter 51-50 WAC). Since 1985, SBCC has been responsible to update to new editions of the building code per RCW 19.27.074. IBC is updated every three years by the ICC. The code development process conducted by the model code organization is open to all interest groups within the design and construction industry and from governmental organizations. See www.iccsafe.org for more information about the model code development process.
The administrative compliance requirements are under the authority of the local governments (RCW 19.27.050). Enforcement activities, including permit issuance, plan review/approval, and inspections occur at the local level. Requirements for construction documents submittal and other reporting mandates are determined by the local jurisdiction and are consistent with previously established policies. The proposed amendments to chapter 51-50 WAC include specific technical requirements for building construction to be consistent with national standards.
Professional Services: Washington has had a statewide building code in effect since 1974. The local enforcement authority having jurisdiction administers the codes through the building and/or fire departments. Administrative procedures for state building code compliance are established and will not be changed by the adoption of the 2021 building codes. Small businesses will employ the same types of professional services for the design and construction of buildings and systems to comply with the state building code. The proposed rule updates the state building code and does not require additional equipment, supplies, labor, or other services. Services needed to comply with the building code are existing within the construction industry as required by the local authority having jurisdiction.
Exemptions: There are 26 significant changes to the model code with economic impact. However, the model code changes are exempt under RCW 19.85.025(3) and 34.05.310 (4)(c), and are not part of this report.
Section 429 related to electric vehicle charging infrastructure is a statutory mandate pursuant to HB 1287 (2021). This section is exempt under RCW 19.85.025(3) and 34.05.310 (4)(e), and is not part of this report.
Costs of Compliance for Businesses: SBCC is required to adopt and maintain the state building code, as provided in chapters 19.27, 19.27A, and 70.92 RCW, and the state legislature. The primary objective of SBCC is to encourage consistency in the building code throughout the state of Washington and to maintain the building code consistent with the state's interest as provided in RCW 19.27.020. An objective of statewide adoption is to minimize state amendments to the model codes. SBCC accepts statewide code amendment proposal from stakeholders to amend IBC to meet the legislative goals. The statewide code adoption process is defined in chapter 51-04 WAC and SBCC bylaws. All proposals must be submitted in writing on the appropriate form with the indicated supporting documentation. Each proponent must identify where a proposed amendment has an economic impact, and estimate the costs and savings of the proposal on construction practices, users and/or the public, the enforcement community, and operation and maintenance.
The cost of compliance incurred by Washington businesses includes training and educational materials. The new 2021 IBC, 2021 IBC Significant changes and 2021 IBC Study pack cost $215 + tax, shipping, and handling. 2021 IBC is also available online at https://shop.iccsafe.org.
For the 2021 code adoption cycle, SBCC received 33 proposals. IBC TAG recommended approval of 28 proposals as submitted or as modified. Nine proposals were identified by TAG as having a cost (increase or decrease) for compliance on businesses. SBCC recommended filing the proposed rule to allow input through the public hearing process.
1. Section 903.3.1.2 (21-GP1-021): Undoes a change that was made to the 2021 IFC and IBC (FS117-18), returning the language in the section to the 2018 text, and aligns the code with the scoping provisions of NFPA 13R. The 2021 change unnecessarily limits the applicability of NFPA 13R systems, particularly for podium buildings, triggering a requirement for a full NFPA 13 system in more buildings. If adopted by SBCC, the 2021 IFC/IBC requirement would decrease affordability for residential construction, since a full NFPA 13 system would be required in shorter buildings. The new proposal will decrease construction cost.
According to a November 2020 article on the National Fire Sprinkler Association website:
• The National Multifamily Housing Council members estimate a NFPA 13 system costs "an average of $1 to $2 more per square foot than NFPA 13R."
• "NFPA Journal notes that installing an NFPA 13 system can cost four to six times more than an NFPA 13R system and include a four to six times greater construction turnaround time."
2. Section 202, new definition for high-rise building (21-GP1-036): This change will address a lack of clarity in the code where it is difficult to determine if an occupied roof is considered a floor. Adding an occupied roof with an occupant load of 50 or more to the definition removes ambiguity. This definition will place some buildings into the high-rise category, which will require additional life-safety systems to be installed that otherwise would not have been required. The proponent establishes that additional costs for these systems could be anywhere between $100,000 to $1,000,000 per project, depending on the size of the project.
Nevertheless, SBCC staff research determined that this cost will not be applicable to all projects. Determining what qualifies as a high-rise building is a fairly unique measurement of height that is not based on the definition of "building height." The critical measurement is from the lowest ground location where a fire department will be able to set its firefighting equipment to a floor level of occupied floors. The term "occupied floor" is not defined in IBC, and as it is stated in this proposal, the requirements for high-rise buildings are enforced differently throughout the state. Some jurisdictions are considering an occupied roof equivalent to an occupied floor; others do not include it into the height measurement. Therefore, SBCC staff considers this proposal clarifies the application of the code, and is needed for consistency with enforcement. There is no statewide direct cost associated with its adoption.
3. Sections IBC 903.2.1.3, Chapter 10 (various sections) and 3116 (21-GP1-66; 21-GP1-67): The code proposals are addressing fixed guideway and passenger rail systems. Proposal #21-GP1-67 is intended to correlate IBC/IFC requirements for fire protection to NFPA 130 requirements. The primary purpose is to clarify the requirements for fire protection at open stations. IBC Chapter 9 requires fire protection in Group A3 occupancies and levels from the Group A3 occupancy to the level of exit discharge. However, for open stations, NFPA 130 only requires fire protection in areas with combustible loading. The code and standard are in conflict, but pursuant to Chapter 1 of IBC, the code language prevails. Some jurisdictions have required fire protection at the platform level and at the plaza level while others have not. This code clarification would bring consistency across all jurisdictions and will result in significant decrease in building cost. For justification, the proponent uses an estimate for elevated station in design in North Seattle, which shows a significant decrease in building costs of $225,348. Proposal # 21-GP1-66 is drawn from NFPA 130 amendments by the City of Bellevue and the City of Seattle for means of egress for light rail stations. The intent is to provide clarity for more consistent application of IBC and NFPA 130 in the future as light rail service expands and extends into new jurisdictions. The proposal clarifies conflicts between IBC and NFPA 130; there is no associated cost with the adoption.
4. Sections 420.14 (new), 202, 505.1, 907.2.11.1, 907.2.11.2, 1011.14, 1015.2, 1015.3 (21-GP1-74): Introduces "lofts" into IBC as WA amendment. The concept is taken from Section R327 of IRC, as amended. Lofts have been proposed and used in several jurisdictions for many years in order to put "extra" space to use. However, there is nothing in the code that regulates them. This proposal is intended to provide a reasonable balance between flexibility and safety for these types of spaces. The proponent determined that there will be an increase in construction costs including the cost for one extra smoke alarm and guards for each loft. The additional costs will depend on the size and number of lofts in the dwelling unit. Smoke alarms cost less than $20 each. Based on the price of deck guard systems, the materials for a premanufactured loft guard system will cost between $15 and $40 a linear foot. Installation costs will be in addition to the material costs. Nevertheless, SBCC staff research determined that there will be no additional cost for businesses if this proposal is adopted. Provisions for lofts are already adopted in IRC (Section R327) and used, on occasions, for projects constructed under IBC. Adopting the same or similar requirements in IBC will provide clarity and consistency for enforcement. The provisions originate from the IRC Appendix Q (Tiny Houses), which contains some provisions for "recreational park vehicles" governed by ANSI A119.5. The adoption of Appendix Q was intended to reduce the cost and allow construction of tiny homes, not to create more restrictive (and expensive) requirements. This includes the provisions for lofts, which lessens the incentive to misrepresent an intended use and enables building departments to regulate the health and safety of loft spaces based on their actual intended use, ensuring health and safety with minimum loft dimensions, requirements for access and egress, and proper emergency escape and rescue openings. SBCC staff considers this proposal is needed to provide more affordable housing, to clarify the application of the code, and for consistency with enforcement. There is no direct cost associated with its adoption if applied to the cost of construction as a whole, and not to the lofts only.
5. Section 706.3 and 703.4 (21-GP1-80): Type III and IV buildings are required to have fire walls made of approved noncombustible materials. Limiting the makeup of fire walls to noncombustible materials can result in problems for taller III and IV buildings. According to the proponent, this change would do away with differential settlement issues making damage to the noncombustible fire wall due to shrinkage of the wood bearing walls less of a factor. The costs associated with this change, as presented by the proponent, would decrease building costs depending on material prices.
6. Section 510.2 (21-GP1-82): This proposal eliminates the Group A 299 occupant load limitation to allow overall provisions found in IBC to dictate the design of the Group A building or building with a Group A occupancy constructed over the horizontal assembly. If accepted, this code change will reduce the cost of construction as buildings above a podium building will have a broader choice of types of construction. The cost will depend on the size/type of projects.
7. Sections 1208.3 (new), 1208.4, 1208.5 (21-GP1-84): Standardizes the minimum size requirements for all dwelling units. The code, as currently written, can be interpreted to allow a one-bedroom unit to be smaller than an efficiency dwelling unit (EDU). The proposal makes it clear that a dwelling unit and efficiency dwelling unit are subject to the same size limitations. It also clarifies that sleeping units are subject to the same minimum size requirements as habitable rooms in dwelling units. This proposal, if adopted, would decrease the cost of developing a one-bedroom unit because it will not be treated differently from an EDU with respect to size. Since the cost depends on the type, size, and location of the project, no cost values are provided by the proponent.
8. Sections 602.4.2.2.2, 602.4.2.2.4 (21-GP1-87): The proposed increase of allowable unprotected area on the ceiling from 20 percent to 100 percent is consistent with the recently completed research conducted at RISE. These fire tests demonstrated that the proposed amounts of unprotected areas on the ceiling and walls, as a function of floor area, can be safely implemented while still achieving the performance objectives specified by ICC Tall Wood Building Ad-Hoc Committee in the development of the tall building mass timber provisions in the 2021 I-codes. The proposal, if adopted, would decrease the cost of construction because it reduces the required amount of noncombustible protection on walls and ceilings in Type IV-B Construction. Since the cost depends on the type, size, and location of the project, no cost values are provided by the proponent.
9. Sections 503.1.4.2, 1015.2 (21-GP1-145): The new amendment requires guards to be provided at the perimeter of the occupied portions of an occupied roof and provides two exceptions (Exception 9 and Exception 10). In addition, the new amendment provides a reference to Section 420.14 pertaining to lofts. Pursuant to the proponent, there are many cases where the design of an occupied roof includes only a portion of the entire roof area. The occupied portions of the roof are typically elevated 18 inches or less above the adjacent unoccupied areas of the roof; therefore, no guard is currently required for these areas. This issue is regularly debated due to the lack of regulatory authority to require the guard in this design scenario. The proposed code change eliminates or drastically reduces the potential for kids and adults who may be inebriated, from falling over the edge of a roof. There will be an increase in cost because more guards will need to be installed for occupied roofs where only a portion of the roof area is occupied. The proponent estimates the cost to be approximately $1/SF of the occupied area of the roof.
Loss of Sales or Revenue: The proposed rules make the state code for building construction consistent with national standards. Businesses with new products or updated test or design standards are recognized in the updated building code. The update will result in some cost outlay for some small businesses for specific building projects, for a transition period. Other small businesses would see an increase in revenue. The amendments to the building codes affect over 25,000 small businesses in the state, where construction activity occurs. The primary intent of the amendments is to improve the safety features in buildings and provide consistency and fairness across the state, for a predictable business environment. The amendments should result in enhanced safety and value in buildings.
Cost of Compliance for Small Businesses: (Determine whether the proposed rule will have a disproportionate cost impact on small businesses, compare the cost of compliance for small business with the cost of compliance for the 10 percent of businesses that are the largest businesses.) Most businesses affected by the updates to the building codes are small businesses; over 95 percent of those listed in the construction and related industries have under 50 employees. The costs per employee are comparable between the largest businesses and the majority of small businesses. The cost to comply with the updated codes is not a disproportionate impact on small businesses. Where SBCC found the cost of compliance for small businesses to be disproportionate, the proposed rule mitigates the cost. The proposed rules include a definition of small business and provide exceptions for compliance with the updated rule.
Small Businesses Involved in the Development of the Rule: For IBC, SBCC conducted 23 open public meetings of the building code technical advisory group, available via telephone conference bridge and over the internet, and allowed comment on every item on every agenda. SBCC appointed over 100 representatives of all segments of the business and construction community to serve on the technical advisory groups.
List of Industries: Below is a list of industries required to comply with the building code:
2017 Industry NAICS Code
NAICS Code Title
Minor
Cost Estimate
1% of Avg Annual Payroll
0.3% of Avg Annual
Gross Business Income
236115
New Single-Family Housing Construction (except For-Sale Builders)
$2,508.04
 $1,919.03
2020 Dataset pulled from USBLS
 $2,508.04
 2020 Dataset pulled from DOR
236116
New Multifamily Housing Construction (except For-Sale Builders)
$32,067.43
 $17,160.94
2020 Dataset pulled from USBLS
 $32,067.43
 2020 Dataset pulled from DOR
236118
Residential Remodelers
$1,457.74
 $1,457.74
2020 Dataset pulled from USBLS
 $901.20
 2020 Dataset pulled from DOR
236210
Industrial Building Construction
$59,169.45
 $59,169.45
2020 Dataset pulled from ESD
 $53,925.71
 2020 Dataset pulled from DOR
236220
Commercial and Institutional Building Construction
$41,552.81
 $18,126.81
2020 Dataset pulled from ESD
 $41,552.81
 2020 Dataset pulled from DOR
238110
Poured Concrete Foundation and Structure Contractors
$3,442.28
 $5,027.07
2019 Dataset pulled from CBP
 $3,442.28
 2020 Dataset pulled from DOR
238120
Structural Steel and Precast Concrete Contractors
$15,401.97
 $20,212.19
2019 Dataset pulled from CBP
 $15,401.97
 2020 Dataset pulled from DOR
238130
Framing Contractors
$2,234.30
 $3,139.71
2019 Dataset pulled from CBP
 $2,234.30
 2020 Dataset pulled from DOR
238140
Masonry Contractors
$1,900.60
 $3,582.13
2019 Dataset pulled from CBP
 $1,900.60
 2020 Dataset pulled from DOR
238150
Glass and Glazing Contractors
$5,255.36
 $9,574.95
2019 Dataset pulled from CBP
 $5,255.36
 2020 Dataset pulled from DOR
238160
Roofing Contractors
$3,589.99
 $5,007.86
2019 Dataset pulled from CBP
 $3,589.99
 2020 Dataset pulled from DOR
238170
Siding Contractors
$1,905.61
 $2,485.86
2019 Dataset pulled from CBP
 $1,905.61
 2020 Dataset pulled from DOR
238190
Other Foundation; Structure; and Building Exterior Contractors
$4,622.07
 $4,141.38
2019 Dataset pulled from CBP
 $4,622.07
 2020 Dataset pulled from DOR
238210
Electrical Contractors and Other Wiring Installation Contractors
$5,941.60
 $9,599.33
2019 Dataset pulled from CBP
 $5,941.60
 2020 Dataset pulled from DOR
238220
Plumbing; Heating; and Air-Conditioning Contractors
$5,353.76
 $11,047.00
2019 Dataset pulled from CBP
 $5,353.76
 2020 Dataset pulled from DOR
238290
Other Building Equipment Contractors
$4,335.21
 $16,142.07
2019 Dataset pulled from CBP
 $4,335.21
 2020 Dataset pulled from DOR
238310
Drywall and Insulation Contractors
$3,725.66
 $9,461.67
2019 Dataset pulled from CBP
 $3,725.66
 2020 Dataset pulled from DOR
238990
All Other Specialty Trade Contractors
$3,585.74
 $3,677.28
2019 Dataset pulled from CBP
 $3,585.74
 2020 Dataset pulled from DOR
321213
Engineered Wood Member (except Truss) Manufacturing
$44,480.76
 $44,480.76
2020 Dataset pulled from ESD
 $41,772.84
 2020 Dataset pulled from DOR
321214
Truss Manufacturing
$28,620.35
 $23,341.04
2020 Dataset pulled from ESD
 $28,620.35
 2020 Dataset pulled from DOR
321219
Reconstituted Wood Product Manufacturing
$30,305.17
 $10,139.90
2020 Dataset pulled from USBLS
 $30,305.17
 2020 Dataset pulled from DOR
321911
Wood Window and Door Manufacturing
$45,151.12
 $18,811.08
2020 Dataset pulled from ESD
 $45,151.12
 2020 Dataset pulled from DOR
321992
Prefabricated Wood Building Manufacturing
$5,391.09
 $5,391.09
2020 Dataset pulled from ESD
 $4,888.53
 2020 Dataset pulled from DOR
327310
Cement Manufacturing
$50,878.29
 $44,741.20
2020 Dataset pulled from ESD
 $50,878.29
 2020 Dataset pulled from DOR
327320
Ready-Mix Concrete Manufacturing
$64,317.30
 $46,126.21
2020 Dataset pulled from ESD
 $64,317.30
 2020 Dataset pulled from DOR
327331
Concrete Block and Brick Manufacturing
$15,030.60
 $15,030.60
2020 Dataset pulled from ESD
 $10,431.02
 2020 Dataset pulled from DOR
332312
Fabricated Structural Metal Manufacturing
$22,220.31
 $16,337.10
2020 Dataset pulled from USBLS
 $22,220.31
 2020 Dataset pulled from DOR
332321
Metal Window and Door Manufacturing
$26,369.28
 $14,505.40
2020 Dataset pulled from ESD
 $26,369.28
 2020 Dataset pulled from DOR
332322
Sheet Metal Work Manufacturing
$23,337.23
 $23,337.23
2020 Dataset pulled from ESD
 $16,556.52
 2020 Dataset pulled from DOR
335121
Residential Electric Lighting Fixture Manufacturing
$2,011.37
 $2,011.37
2020 Dataset pulled from USBLS
 $1,502.01
 2020 Dataset pulled from DOR
335122
Commercial; Industrial; and Institutional Electric Lighting Fixture Manufacturing
$6,357.34
 Redacted
2020 Dataset pulled from USBLS
 $6,357.34
 2020 Dataset pulled from DOR
335129
Other Lighting Equipment Manufacturing
$6,281.32
 $6,281.32
2020 Dataset pulled from ESD
 $2,494.40
 2020 Dataset pulled from DOR
423720
Plumbing and Heating Equipment and Supplies (Hydronics) Merchant Wholesalers
$24,486.53
 $16,589.10
2020 Dataset pulled from ESD
 $24,486.53
 2020 Dataset pulled from DOR
541310
Architectural Services
$9,221.65
 $9,221.65
2020 Dataset pulled from ESD
 $3,738.99
 2020 Dataset pulled from DOR
541330
Engineering Services
$14,801.92
 $14,801.92
2020 Dataset pulled from USBLS
 $7,177.43
 2020 Dataset pulled from DOR
541350
Building Inspection Services
$1,868.52
 $1,868.52
2020 Dataset pulled from ESD
 $475.93
 2020 Dataset pulled from DOR
561621
Security Systems Services (except Locksmiths)
 $9,759.28
 $9,759.28
2020 Dataset pulled from ESD
 $6,117.04
 2020 Dataset pulled from DOR
Estimate of the Number of Jobs That Will Be Created or Lost: The adoption of the latest code edition is not expected to significantly impact the number of jobs in the construction industry. These rules are likely to be job neutral overall; i.e., they will not result in any job gains or losses. The scheduled effective date of the new edition is July 1, 2021. Building permits issued prior to that date will be vested under the 2018 building code. Permits issued for projects under the 2021 code edition will generally start with the 2024 construction season.
A copy of the statement may be obtained by contacting Stoyan Bumbalov, 1500 Jefferson Street S.E., Olympia, WA 98504, phone 360-407-9277, email stoyan.bumbalov@des.wa.gov.
December 30, 2021
Andrew S. Klein
Council Chair
OTS-3404.3
AMENDATORY SECTION(Amending WSR 20-01-090, filed 12/12/19, effective 7/1/20)
WAC 51-50-003International Building Code.
The ((2018))2021 edition of the International Building Code, including Appendix E, published by the International Code Council is hereby adopted by reference with the exceptions noted in this chapter of the Washington Administrative Code.
AMENDATORY SECTION(Amending WSR 13-04-067, filed 2/1/13, effective 7/1/13)
WAC 51-50-005International Building Code requirements for barrier-free accessibility.
Chapter 11 and other International Building Code requirements for barrier-free access, including ICC ((A117.1-2009))A117.1-2017 and Appendix E, are adopted pursuant to chapters 70.92 and 19.27 RCW.
Pursuant to RCW 19.27.040, Chapter 11 and requirements affecting barrier-free access shall not be amended by local governments.
AMENDATORY SECTION(Amending WSR 16-03-064, filed 1/19/16, effective 7/1/16)
WAC 51-50-007Exceptions.
The exceptions and amendments to the International Building Code contained in the provisions of chapter 19.27 RCW shall apply in case of conflict with any of the provisions of these rules.
The provisions of this code do not apply to temporary growing structures used solely for the commercial production of horticultural plants including ornamental plants, flowers, vegetables, and fruits. "Temporary growing structure" means a structure that has the sides and roof covered with polyethylene, polyvinyl, or similar flexible synthetic material and is used to provide plants with either frost protection or increased heat retention. A temporary growing structure is not considered a building for purposes of this code.
The provisions of this code do not apply to the construction, alteration, or repair of temporary worker housing except as provided by rule adopted under chapter 70.114A RCW or chapter 37, Laws of 1998 (SB 6168). "Temporary worker housing" means a place, area, or piece of land where sleeping places or housing sites are provided by an employer for his or her employees or by another person, including a temporary worker housing operator, who is providing such accommodations for employees, for temporary, seasonal occupancy, and includes "labor camps" under RCW 70.54.110.
Codes referenced which are not adopted through RCW 19.27.031 or chapter 19.27A RCW shall not apply unless specifically adopted by the authority having jurisdiction. The ((2015))2021 International Existing Building Code is included in the adoption of this code in Section 101.4.7 and amended in WAC 51-50-480000.
AMENDATORY SECTION(Amending WSR 21-11-066, filed 5/14/21, effective 6/14/21)
WAC 51-50-008Implementation.
The International Building Code adopted under chapter 51-50 WAC shall become effective in all counties and cities of this state on ((February 1, 2021))July 1, 2023.
AMENDATORY SECTION(Amending WSR 16-03-064, filed 1/19/16, effective 7/1/16)
WAC 51-50-009((Recyclable materials, compost, and solid waste storage.))Reserved.
((For the purposes of this section, the following definitions shall apply:
COMPOST means biodegradable solid wastes that are separated for composting such as food waste, food soiled paper and yard waste.
RECYCLED MATERIALS means those solid wastes that are separated for recycling or reuse, such as papers, metals and glass.
All local jurisdictions shall require that space be provided for the storage of recycled materials, compost, and solid waste for all new buildings.
EXCEPTION:
Group R-3 and Group U Occupancies.
The storage area shall be designed to meet the needs of the occupancy, efficiency of pickup, and shall be available to occupants and haulers.))
AMENDATORY SECTION(Amending WSR 20-21-021, filed 10/9/20, effective 11/9/20)
WAC 51-50-0110((Section inspections.))Reserved.
((110.3.5 Type IV-A, IV-B, and IV-C connection protection inspection. In buildings of Type IV-A, IV-B, and IV-C construction, where connection fire-resistance ratings are provided by wood cover calculated to meet the requirements of Section 2304.10.1, inspection of the wood cover shall be made after the cover is installed, but before any other coverings or finishes are installed.
110.3.6 Lath, gypsum board and gypsum panel product inspection. Lath, gypsum board and gypsum panel product inspections shall be made after lathing, gypsum board and gypsum panel products, interior and exterior, are in place, but before any plastering is applied or gypsum board and gypsum panel product joints and fasteners are taped and finished.
EXCEPTION:
Gypsum board and gypsum panel products that are not part of a fire-resistance-rated assembly or a shear assembly.
110.3.7 Weather-exposed balcony and walking surface waterproofing. Where balconies or other elevated walking surfaces are exposed to water from direct or blowing rain, snow or irrigation, and the structural framing is protected by an impervious moisture barrier, all elements of the impervious moisture barrier system shall not be concealed until inspected and approved.
EXCEPTION:
Where special inspections are provided in accordance with Section 1705.1.1, Item 3.
110.3.8 Fire- and smoke-resistant penetrations. Protection of joints and penetrations in fire-resistance-rated assemblies, smoke barriers and smoke partitions shall not be concealed from view until inspected and approved.
110.3.9 Energy efficiency inspections. Inspections shall be made to determine compliance with Chapter 13 and shall include, but not be limited to, inspections for: Envelope insulation R- and U-values, fenestration U-value, duct system R-value, and HVAC and water-heating equipment efficiency.
110.3.10 Other inspections. In addition to the inspections specified in Sections 110.3.1 through 110.3.8, the building official is authorized to make or require other inspections of any construction work to ascertain compliance with the provisions of this code and other laws that are enforced by the department of building safety.
110.3.11 Special inspections. For special inspections, see Chapter 17.
110.3.12 Final inspection. The final inspection shall be made after all work required by the building permit is completed.
110.3.12.1 Flood hazard documentation. If located in a flood hazard area, documentation of the elevation of the lowest floor as required in Section 1612.4 shall be submitted to the building official prior to the final inspection.))
AMENDATORY SECTION(Amending WSR 21-12-103, filed 6/2/21, effective 7/3/21)
WAC 51-50-0200Chapter 2Definitions.
SECTION 202—DEFINITIONS.
ADULT FAMILY HOME. A dwelling, licensed by the state of Washington department of social and health services, in which a person or persons provide personal care, special care, room and board to more than one but not more than six adults who are not related by blood or marriage to the person or persons providing the services. An existing adult family home may provide services to up to eight adults upon approval from the department of social and health services in accordance with RCW 70.128.066.
ASSISTED LIVING FACILITY. A home or other institution, licensed by the state of Washington, providing housing, basic services and assuming general responsibility for the safety and well-being of residents under chapters 18.20 RCW and 388-78A WAC. These facilities may provide care to residents with symptoms consistent with dementia requiring additional security measures.
AUTOMATIC LOAD MANAGEMENT SYSTEM (ALMS). A system designed to manage electrical load across one or more EV Ready parking spaces.
BOTTLE FILLING STATION. A plumbing fixture connected to the potable water distribution system and sanitary drainage system that is designed and intended for filling personal use drinking water bottles or containers not less than 10 inches (254 mm) in height. Such fixtures can be separate from or integral to a drinking fountain and can incorporate a water filter and a cooling system for chilling the drinking water.
CHILD CARE. The care of children during any period of a 24-hour day.
CHILD CARE, FAMILY HOME. A child care facility, licensed by Washington state, located in the dwelling of the person or persons under whose direct care and supervision the child is placed, for the care of twelve or fewer children, including children who reside at the home.
CLIMATE ZONE. A geographical region that has been assigned climatic criteria as specified in the Washington State Energy Code.
CLUSTER. Clusters are multiple portable school classrooms separated by less than the requirements of the building code for separate buildings.
COMPOST. Biodegradable solid wastes that are separated for composting such as food waste, food soiled paper, and yard waste.
EFFICIENCY DWELLING UNIT. A dwelling unit where all permanent provisions for living, sleeping, eating and cooking are contained in a single room.
ELECTRIC VEHICLE (EV) CAPABLE PARKING SPACE. A parking space provided with a conduit, electrical panel and load capacity to support future installation of EV charging equipment.
ELECTRIC VEHICLE (EV) CHARGER. Off-board charging equipment used to charge electric vehicles.
ELECTRIC VEHICLE (EV) CHARGING STATION. EV Ready parking space with installed EV charger.
ELECTRIC VEHICLE (EV) READY PARKING SPACE. A parking space provided with a receptacle outlet allowing charging of electric vehicles.
ELECTRIC VEHICLE SUPPLY EQUIPMENT (EVSE). The conductors, including the ungrounded, grounded, and equipment grounding conductors, and the electric vehicle connectors, attachment plugs, personnel protection system, and all other fittings, devices, power outlets, or apparatus installed specifically for the purpose of transferring energy between the premises wiring and the electric vehicle.
HIGH-RISE BUILDING. A building with an occupied floor, located more than 75 feet (22,860 mm) above the lowest level of fire department vehicle access. For the purposes of this definition, an occupied roof with an occupant load of 50 or more is considered to be an occupied floor.
HOSPICE CARE CENTER. A building or portion thereof used on a 24-hour basis for the provision of hospice services to terminally ill inpatients.
((MASS TIMBER. Structural elements of Type IV construction primarily of solid, built-up, panelized or engineered wood products that meet minimum cross section dimensions of Type IV construction.))
LOFT. A space on an intermediate level or levels between the floor and ceiling of a Group R occupancy dwelling or sleeping unit, open on one or more sides to the room in which the loft is located, and in accordance with Section 420.13.
NIGHTCLUB. An A-2 Occupancy ((use under the 2006 International Building Code)) in which the aggregate area of concentrated use of unfixed chairs and standing space that is specifically designated and primarily used for dancing or viewing performers exceeds three hundred fifty square feet, excluding adjacent lobby areas. "Nightclub" does not include theaters with fixed seating, banquet halls, or lodge halls.
((NONCOMBUSTIBLE PROTECTION (For MASS TIMBER). Noncombustible material, in accordance with Section 703.5, designed to increase the fire-resistance rating and delay the combustion of mass timber.))
PORTABLE SCHOOL CLASSROOM. A prefabricated structure consisting of one or more rooms with direct exterior egress from the classroom(s). The structure is transportable in one or more sections and is designed to be used as an educational space with or without a permanent foundation. The structure shall be capable of being demounted and relocated to other locations as needs arise.
RECYCLED MATERIALS. Those solid wastes that are separated for recycling or reuse, such as papers, metals, and glass.
RESIDENTIAL SLEEPING SUITES. A unit that provides multiple rooms or spaces for up to five residents, includes provisions for sleeping and can include provisions for living, eating, sanitation, and kitchen facilities.
SMALL BUSINESS. Any business entity (including a sole proprietorship, corporation, partnership or other legal entity) which is owned and operated independently from all other businesses, which has the purpose of making a profit, and which has fifty or fewer employees.
STAGED EVACUATION. A method of emergency response, that engages building components and trained staff to provide occupant safety during an emergency. Emergency response involves moving or holding certain occupants at temporary locations for a brief period of time before evacuating the building. This response is used by ambulatory surgery facility and assisted living facilities to protect the health and safety of fragile occupants and residents.
((WALL, LOAD-BEARING. Any wall meeting either of the following classifications:
1. Any metal or wood stud wall that supports more than 100 pounds per linear foot (1459 N/m) of vertical load in addition to its own weight.
2. Any masonry or concrete, or mass timber wall that supports more than 200 pounds per linear foot (2919 N/m) of vertical load in addition to its own weight.))
AMENDATORY SECTION(Amending WSR 16-03-064, filed 1/19/16, effective 7/1/16)
WAC 51-50-0306Section 306Factory Group F.
306.2 Moderate-hazard factory industrial, Group F-1. Factory industrial uses that are not classified as factory industrial F-2 low hazard shall be classified as F-1 moderate hazard and shall include, but not be limited to, the following:
Aircraft (manufacturing, not to include repair)
Appliances
Athletic equipment
Automobiles and other motor vehicles
Bakeries
Beverages: Over 16 percent alcohol content
Bicycles
Boats
Brooms or brushes
Business machines
Cameras and photo equipment
Canvas or similar fabric
Carpets and rugs (includes cleaning)
Clothing
Construction and agricultural machinery
Disinfectants
Dry cleaning and dyeing
Electric generation plants
Electronics
Energy storage systems (ESS) in dedicated use buildings
Engines (including rebuilding)
Food processing establishments and commercial kitchens not associated with restaurants, cafeterias and similar dining facilities more than 2,500 square feet (232m2) in area
Furniture
Hemp products
Jute products
Laundries
Leather products
Machinery
Marijuana processing
Metals
Millwork (sash and door)
Motion pictures and television filming (without spectators)
Musical instruments
Optical goods
Paper mills or products
Photographic film
Plastic products
Printing or publishing
Recreational vehicles
Refuse incineration
Shoes
Soaps and detergents
Textiles
Tobacco
Trailers
Upholstering
Water/sewer treatment facilities
Wood; distillation
Woodworking (cabinet)
AMENDATORY SECTION(Amending WSR 20-21-021, filed 10/9/20, effective 11/9/20)
WAC 51-50-0308Section 308Institutional Group I.
((308.1.1 Definitions. The following terms are defined in Chapter 2:
24-HOUR CARE.
Custodial Care.
Detoxification Facilities.
Foster Care Facilities.
HOSPICE CARE CENTER.
Hospitals and psychiatric hospitals.
Incapable of self-preservation.
Medical care.
Nursing homes.))
308.2 Institutional Group I-1. Institutional Group I-1 occupancy shall include buildings, structures or portions thereof for more than sixteen persons, excluding staff, who reside on a twenty-four-hour basis in a supervised environment and receive custodial care. Buildings of Group I-1 shall be classified as one of the occupancy conditions specified in Section 308.2.1 or 308.2.2 and shall comply with Section 420. This group shall include, but not be limited to, the following:
Alcohol and drug centers;
Assisted living facilities as licensed by Washington state under chapter 388-78A WAC;
Congregate care facilities;
Group homes;
Halfway houses;
Residential board and care facilities;
Social rehabilitation facilities;
Residential treatment facilities as licensed by Washington state under chapter 246-337 WAC.
308.2.5 Adult family homes. Adult family homes licensed by Washington state shall be classified as Group R-3 or shall comply with the International Residential Code.
308.2.6 Licensed care facilities. Assisted living facilities as licensed by Washington state under chapter 388-78A WAC shall be classified as Group I-1, Condition 2.
Residential treatment facilities licensed by Washington state under chapter 246-337 WAC shall be classified as one or more occupancy types in accordance with chapter 246-337 WAC.
308.3 Institutional Group I-2. Institutional Group I-2 occupancy shall include buildings and structures used for medical care on a 24-hour basis for more than five persons who are incapable of self-preservation. This group shall include, but not be limited to, the following:
Foster care facilities.
Detoxification facilities.
Hospice care centers.
Hospitals.
Nursing homes.
Psychiatric hospitals.
308.5.5 Family home child care. Family home child care licensed by Washington state for the care of twelve or fewer children shall be classified as Group R-3 or shall comply with the International Residential Code.
AMENDATORY SECTION(Amending WSR 20-01-090, filed 12/12/19, effective 7/1/20)
WAC 51-50-0309Section 309Mercantile Group M.
309.1 Mercantile Group M. Mercantile Group M occupancy includes, among others, the use of a building or structure or a portion thereof for the display and sale of merchandise, and involves stocks of goods, wares or merchandise incidental to such purposes and ((accessible to))where the public has access. Mercantile occupancies shall include, but not be limited to, the following:
• Art galleries 3,000 square feet or less;
• Department stores;
• Drug stores;
• Markets;
• Greenhouses for display and sale of plants that provide public access;
• Motor fuel-dispensing facilities;
• Retail or wholesale stores;
• Sales rooms.
AMENDATORY SECTION(Amending WSR 21-06-035, filed 2/23/21, effective 3/26/21)
WAC 51-50-0310Section 310Residential Group R.
310.3 Residential Group R-2. Residential occupancies containing sleeping units or more than two dwelling units where the occupants are primarily permanent in nature, including:
Apartment houses
((Boarding houses (nontransient) with more than 16 occupants))
Congregate living facilities (nontransient) with more than 16 occupants
Boarding houses (nontransient)
Convents
Dormitories
Fraternities and sororities
Monasteries
Hotels (nontransient)
Live/work units
((Monasteries))
Motels (nontransient)
Vacation timeshare properties
310.4.3 Adult family homes, family home child care. Adult family homes and family home child care facilities that are within a single-family home are permitted to comply with the International Residential Code.
310.4.4 Foster family care homes. Foster family care homes licensed by Washington state are permitted to comply with the International Residential Code, as an accessory use to a dwelling, for six or fewer children including those of the resident family.
310.5 Residential Group R-4. R-4 classification is not adopted. Any reference in this code to R-4 does not apply.
AMENDATORY SECTION(Amending WSR 20-01-090, filed 12/12/19, effective 7/1/20)
WAC 51-50-0403Section 403High-rise buildings.
((403.3.2 Water supply to required fire pumps. In all buildings that are more than 420 feet (128 m) in building height, and buildings of Type IV-A and IV-B that are more than 120 feet in building height, required fire pumps shall be supplied by connections to not fewer than two water mains located in different streets. Separate supply piping shall be provided between each connection to the water main and the pumps. Each connection and the supply piping between the connection and the pumps shall be sized to supply the flow and pressure required for the pumps to operate.
EXCEPTION:
Two connections to the same main shall be permitted provided that the main is valved such that an interruption can be isolated so that the water supply will continue without interruption through not fewer than one of the connections.))
403.5.4 Smokeproof enclosures. Every required interior exit stairway serving floors more than 75 feet (22,860 mm) above the lowest level of fire department vehicle access shall be a smokeproof enclosure in accordance with Sections 909.20 and ((1023.11))1023.12. Where interior exit stairways and ramps are pressurized in accordance with Section 909.20.5, the smoke control pressurization system shall comply with the requirements specified in Section 909.6.3.
403.4.8.3 Standby power loads. The following are classified as standby power loads:
1. Ventilation and automatic fire detection equipment for smokeproof enclosures.
2. Elevators.
3. Where elevators are provided in a high-rise building for accessible means of egress, fire service access or occupant self-evacuation, the standby power system shall also comply with Sections 1009.4, 3007 or 3008, as applicable.
4. Sump pumps required by ASME A17.1 serving pit drains at the bottom of elevator hoistways of fire service access or occupant evacuation elevators.
((405.7.2 Smokeproof enclosure. Every required stairway serving floor levels more than 30 feet (9144 mm) below the finished floor of its level of exit discharge shall comply with the requirements for a smokeproof enclosure as provided in Sections 909.20 and 1023.11. Where interior exit stairways and ramps are pressurized in accordance with Section 909.20.5, the smoke control pressurization system shall comply with the requirements specified in Section 909.6.3.))
NEW SECTION
WAC 51-50-0405Section 405Underground buildings.
405.7.2 Smokeproof enclosure. Every required stairway serving floor levels more than 30 feet (9144 mm) below the finished floor of its level of exit discharge shall comply with the requirements for a smokeproof enclosure as provided in Sections 909.20 and 1023.12. Where interior exit stairways and ramps are pressurized in accordance with Section 909.20.5, the smoke control pressurization system shall comply with the requirements specified in Section 909.6.3.
AMENDATORY SECTION(Amending WSR 20-01-090, filed 12/12/19, effective 7/1/20)
WAC 51-50-0407((Section 407Group I-2.))Reserved.
((407.4.4.3 Access to corridor. Movement from habitable rooms shall not require passage through more than three doors and 100 feet (30,480 mm) distance of travel within the suite.))
AMENDATORY SECTION(Amending WSR 21-06-035, filed 2/23/21, effective 3/26/21)
WAC 51-50-0412Section 412Aircraft-related occupancies.
412.2.2.1 Stairways. Stairways in airport traffic control towers shall be in accordance with Section 1011. Exit stairways shall be smokeproof enclosures complying with one of the alternatives provided in Section 909.20. Where interior exit stairways and ramps are pressurized in accordance with Section 909.20.5, the smoke control pressurization system shall comply with the requirements specified in Section 909.6.3.
[F] 412.7.3 Means of egress. The means of egress from heliports, helipads and helistops shall comply with the provisions of Chapter 10. Landing areas located on buildings or structures shall have two or more ((means of egress))exits or access to exits. For landing areas less than 60 feet in length or less than 2,000 square feet (186 m2) in area, the second means of egress is permitted to be a fire escape, alternating tread device or ladder leading to the floor below. On Group I-2 roofs with heliports or helipads and helistops, rooftop structures enclosing exit stair enclosures or elevator shafts shall be enclosed with fire barriers and opening protectives that match the rating of their respective shaft enclosures below.
AMENDATORY SECTION(Amending WSR 20-01-090, filed 12/12/19, effective 7/1/20)
WAC 51-50-0420Section 420Groups I-1, R-1, R-2, R-3.
420.2 Separation walls. Walls separating dwelling units in the same building, walls separating sleeping units in the same building and walls separating dwelling or sleeping units from other occupancies contiguous to them in the same building shall be constructed as fire partitions in accordance with Section 708. Buildings containing multiple sleeping units with common use or central kitchens shall not be classified as a single dwelling.
EXCEPTIONS:
1. Where sleeping units include private bathrooms, walls between bedrooms and the associated private bathrooms are not required to be constructed as fire partitions.
 
2. Where sleeping units are constructed as suites, walls between bedrooms within the sleeping unit and the walls between the bedrooms and associated living spaces are not required to be constructed as fire partitions.
 
3. In Groups R-3 facilities, walls within the dwelling units or sleeping units are not required to be constructed as fire partitions.
 
4. Groups R-2 and I-1 arranged into residential sleeping suites containing a maximum of five sleeping residents. Separation between bedrooms, living areas and toilet rooms within these residential sleeping suites shall not be required.
 
5. Group I-1 sleeping areas arranged so that a dedicated staff member has direct observation over a multiple resident sleeping room, without intervening full height walls, shall not be required to provide fire partitions within the resident sleeping area.
((420.11))420.12 Adult family homes. This section shall apply to all newly constructed adult family homes and all existing single-family homes being converted to adult family homes. This section shall not apply to those adult family homes licensed by the state of Washington department of social and health services prior to July 1, 2001.
((420.11.1))420.12.1 Sleeping room classification. Each sleeping room in an adult family home shall be classified as one of the following:
1. Type S - Where the means of egress contains stairs, elevators or platform lifts.
2. Type NS1 - Where one means of egress is at grade level or a ramp constructed in accordance with Section ((420.7.8))1012 is provided.
3. Type NS2 - Where two means of egress are at grade level or ramps constructed in accordance with Section ((420.7.8))1012 are provided.
((420.11.2))420.12.2 Types of locking devices and door activation. All bedrooms and bathroom doors shall be openable from the outside when locked.
Every closet door shall be readily openable from the inside.
Operable parts of door handles, pulls, latches, locks and other devices installed in adult family homes shall be operable with one hand and shall not require tight grasping, pinching, or twisting of the wrist. Pocket doors shall have graspable hardware available when in the closed or open position.
The force required to activate operable parts shall be 5.0 pounds (22.2 N) maximum. Required exit door(s) shall have no additional locking devices. Required exit door hardware shall unlock inside and outside mechanisms when exiting the building allowing reentry into the adult family home without the use of a key, tool or special knowledge.
((420.11.3))420.12.3 Smoke and carbon monoxide alarm requirements. Alarms shall be installed in such a manner so that the detection device warning is audible from all areas of the dwelling upon activation of a single alarm.
((420.11.4))420.12.4 Escape windows and doors. Every sleeping room shall be provided with emergency escape and rescue windows as required by Section 1030. No alternatives to the sill height such as steps, raised platforms or other devices placed by the openings will be approved as meeting this requirement.
((420.11.5))420.12.5 Grab bar general requirements. Where facilities are designated for use by adult family home clients, grab bars for water closets, bathtubs and shower stalls shall be installed according to ICC A117.1.
((420.11.6))420.12.6 Shower stalls. Where provided to meet the requirements for bathing facilities, the minimum size of shower stalls for an adult family home shall be 30 inches deep by 48 inches long.
((420.12))420.13 Licensed care cooking facilities. In Group I-1, Condition 2 assisted living facilities licensed under chapter 388-78A WAC and residential treatment facilities licensed under chapter 246-337 WAC, rooms or spaces that contain a cooking facility with domestic cooking appliances shall be permitted to be open to the corridor where all of the following criteria are met:
1. The number of care recipients housed in the smoke compartment is not greater than 30.
2. The number of care recipients served by the cooking facility is not greater than 30.
3. Only one cooking facility area is permitted in a smoke compartment.
4. The types of domestic cooking appliances permitted are limited to ovens, cooktops, ranges, warmers and microwaves.
5. The corridor is a clearly identified space delineated by construction or floor pattern, material or color.
6. The space containing the domestic cooking facility shall be arranged so as not to obstruct access to the required exit.
7. A domestic cooking hood installed and constructed in accordance with Section 505 of the International Mechanical Code is provided over the cooktop or range.
8. The domestic cooking hood provided over the cooktop or range shall be equipped with an automatic fire-extinguishing system of a type recognized for protection of domestic cooking equipment. Preengineered automatic extinguishing systems shall be tested in accordance with UL 300A and listed and labeled for the intended application. The system shall be installed in accordance with this code, its listing and the manufacturer's instructions.
9. A manual actuation device for the hood suppression system shall be installed in accordance with Sections ((904.12.1 and 904.12.2))904.13.1 and 904.13.2.
10. An interlock device shall be provided such that upon activation of the hood suppression system, the power or fuel supply to the cooktop or range will be turned off.
11. A shut-off for the fuel and electrical power supply to the cooking equipment shall be provided in a location that is accessible only to staff.
12. A timer shall be provided that automatically deactivates the cooking appliances within a period of not more than 120 minutes.
13. A portable fire extinguisher shall be installed in accordance with Section 906 of the International Fire Code.
420.14 Lofts. Where provided in Group R occupancies, lofts shall comply with this code as modified by Sections 420.14.1 through 420.14.5. Lofts constructed in compliance with this section shall be considered a portion of the story below. Such lofts shall not contribute to either the building area or number of stories as regulated by Section 503.1. The loft floor area shall be included in determining the fire area.
EXCEPTION:
Lofts need not comply with Section 420.13 where they meet any of the following conditions:
 
1. The loft has a maximum depth of less than 3 feet (914 mm).
 
2. The loft has a floor area of less than 35 square feet (3.3 m2).
 
3. The loft is not provided with a permanent means of egress.
420.14.1 Loft limitations.Lofts shall comply with the following conditions:
1. The loft floor area shall be less than 70 square feet (6.5 m2).
2. The loft ceiling height shall not exceed 7 feet (2134 mm) for more than one-half of the loft floor area.
The provisions of Sections 420.14.2 through 420.14.5 shall not apply to lofts that do not comply with Items 1 and 2.
420.14.2 Loft ceiling height. The ceiling height below a loft shall not be less than 7 feet (2134 mm). The ceiling height above the finished floor of the loft shall not be less than 3 feet (914 mm). Portions of the loft with a sloped ceiling measuring less than 3 feet (914 mm) from the finished floor to the finished ceiling shall not contribute to the loft floor area.
420.14.3 Loft area. The aggregate area of all lofts and mezzanines within a room shall comply with Section 505.2.1.
EXCEPTION:
The area of a single loft shall not be greater than two-thirds of the area of the room in which it is located, provided that no other lofts or mezzanines are open to the room in which the loft is located.
420.14.4 Permanent egress for lofts. Where a permanent means of egress is provided for lofts, the means of egress shall comply with Chapter 10 as modified by Section 420.14.4.1.
420.14.4.1 Ceiling height at loft means of egress. A minimum ceiling height of 3 feet shall be provided for the entire width of the means of egress from the loft.
420.14.5 Smoke alarms. Single- or multiple-station smoke alarms shall be installed in all lofts in accordance with Section 907.2.11.1 or 907.2.11.2.
AMENDATORY SECTION(Amending WSR 21-16-063, filed 7/29/21, effective 8/29/21)
WAC 51-50-0429Section 429Electric vehicle charging infrastructure.
((429.1 Scope. The provisions of this section shall apply to the construction of new buildings.
EXCEPTIONS:
1. Occupancies classified as Group R-3 or Group U.
 
2. Group A, Group E, or Group M occupancies, except where employee parking spaces are designated. The provisions of Section 429 shall apply only to those designated employee parking spaces.
429.2 Required electric vehicle charging infrastructure. Where parking is provided, ten percent of parking spaces shall be provided with electric vehicle charging infrastructure in compliance with Sections 429.3, 429.4 and 429.5. When the calculation of percent served results in a fractional parking space, the applicant shall round up to the next whole number.
429.3 Electrical room(s). Electrical room(s) serving buildings with on-site parking spaces must be sized to accommodate the potential for electrical equipment and distribution required to serve a minimum of 20 percent of the total parking spaces with 208/240 V 40-amp, circuit or equivalent electric vehicle charging infrastructure.
429.4 Electric vehicle charging infrastructure. Electric vehicle charging infrastructure shall meet the following requirements:
1. A minimum number of 208/240 V 40-amp, circuit or equivalent electric vehicle charging stations required to serve the parking spaces specified in Section 429.2. The electric vehicle charging stations shall be located to serve spaces designated for parking and charging electric vehicles.
2. Additional service capacity, space for future meters, panel capacity or space for additional panels, and raceways for future installation of electric vehicle charging stations. The service capacity and raceway size shall be designed to accommodate the future installation of the number of 208/240 V 40-amp, circuit or equivalent electric vehicle charging stations specified in Section 429.2. The raceway shall terminate at spaces designated for parking and charging electric vehicles in the future.
Where designated electric vehicle charging locations serve exterior on-grade parking spaces that are located more than 4 feet from a building, raceways shall be extended below grade to a pull box in the vicinity of the designated future electric vehicle charging locations or stub above grade in the vicinity of the designated future electric vehicle charging locations, protected from vehicles by a curb or other device.
EXCEPTION:
In lieu of surface-mounted raceway between the electrical panel and the designated electric vehicle charging locations, it is permitted to provide permanent markings indicating the pathway for future raceway, and one-inch diameter capped sleeves through each wall and floor assembly that are penetrated along that route. This pathway and the locations of capped sleeves shall also be indicated on the electrical plans. Raceway shall be installed for any portion of the pathway located below slabs, below grade, or within floor, wall or roof assemblies.
Load management infrastructure may be used to adjust the size and capacity of the required building electric service equipment and circuits on the customer facilities, as well as electric utility owned infrastructure, as allowed by applicable local and national electric codes.
429.5 Electric vehicle charging infrastructure for accessible parking spaces. When electric vehicle charging infrastructure is required, ten percent of accessible parking space, rounded to the next whole number, shall be provided with electric vehicle charging infrastructure. The electric vehicle charging infrastructure may also serve adjacent parking spaces not designated as accessible parking. A maximum of ten percent rounded to the next whole number, of the accessible parking spaces are allowed to be included in the total number of electric vehicle parking spaces required under Section 429.2.))
429.1 General. The provisions of this section shall apply to the construction of new buildings and accessory structures, including parking lots and parking garages.
Electric vehicle supply equipment (EVSE) shall be installed in accordance with applicable requirements of chapter 19.28 RCW and the National Electrical Code, Article 625.
EXCEPTION:
Electric vehicle charging infrastructure is not required if any of the following conditions are met:
 
1. There is no public utility or commercial power supply.
 
2. Dwelling units without garages or other on-site parking.
429.2 Electric vehicle (EV) charging infrastructure. Buildings and accessory structures shall be provided with EV charging stations, EV-Ready parking spaces, and EV-capable parking spaces in accordance with Table 429.2. Calculations shall be rounded up to the nearest whole number. Where a building contains more than one occupancy, the electric vehicle charging infrastructure percentages of Table 429.2 shall be applied to the number of spaces required for each occupancy.
EXCEPTIONS:
1. Except for Group A, Group E, and Group M occupancies, on-site parking with less than 10 parking spaces shall not be required to comply with Section 429.2.
 
2. Group A, Group E, and Group M occupancies shall comply with one of the following, whichever is greater:
 
2.1. The provisions of Section 429.2 shall apply only to designated employee parking spaces.
 
2.2. One of each 200 parking spaces or fraction thereof shall be EV Ready. One of each 200 parking spaces or fraction thereof shall be an EV Charging Station.
Table 429.2
Electric Vehicle Charging Infrastructure
Occupancy
Number of EV
Charging Stations
Number of EV-Ready Parking Spaces
Number of EV-Capable Parking Spaces
Group A, B, E, F, H, I, M, and S occupancies
10% of total parking spaces
10% of total parking spaces
10% of total parking spaces
Group R occupancies
 
Buildings that do not contain more than two dwelling units
Not required
One for each dwelling unit
Not required
 
Dwelling units with private garages
Not required
One for each dwelling unit
Not required
All other Group R occupancies
10% of total parking spaces
25% of total parking spaces
10% of total parking spaces
429.2.1 EV charging stations and EV-Ready parking spaces. A minimum of 40-ampere dedicated 208/240-volt branch circuit shall be installed for each EV Ready parking space and each EV Charging Station. The branch circuits shall terminate at a receptacle outlet or EV charger in close proximity to the proposed location of the EV Ready parking space or the EV Charging Station.
429.2.2 EV-Capable parking spaces. A listed raceway capable of accommodating a minimum of 40-ampere dedicated 208/240-volt branch circuit shall be installed for each EV-Capable parking space. The raceway shall terminate into a cabinet, box or other enclosure in close proximity to the proposed location of the EV-Capable parking space. Raceways and related components that are planned to be installed underground, and in enclosed, inaccessible or concealed areas and spaces, shall be installed at the time of original construction.
429.3 Electrical room(s) and equipment. Electrical room(s) and/or dedicated electrical equipment shall be sized to accommodate the requirements of Section 429.
The electrical service and the electrical system, including any on-site distribution transformer(s), shall have sufficient capacity to simultaneously charge all EVs at all required EV Charging Stations, EV Ready parking spaces, and EV-Capable parking spaces at a minimum of 40-amperes each.
EXCEPTION:
Automatic Load Management System (ALMS) may be used to adjust the maximum electrical capacity required for the EV-Ready and EV-Capable parking spaces. The ALMS must be designed to allocate charging capacity among multiple future EV Charging Stations at a minimum of 16 amperes per EV charger.
429.4 Electric vehicle charging infrastructure for accessible parking spaces. Ten percent of the accessible parking spaces, rounded to the next whole number, shall be EV Charging Stations. Additional ten percent of the accessible parking spaces, rounded to the next whole number, shall be EV Ready.
The electric vehicle charging infrastructure may also serve adjacent parking spaces not designated as accessible parking. A maximum of ten percent of the accessible parking spaces, rounded to the next whole number, are allowed to be included in the total number of electric vehicle parking spaces required under Section 429.3.
NEW SECTION
WAC 51-50-0430Section 430—Recycled materials.
430 Recyclable materials, compost, and solid waste storage. Space shall be provided for the storage of recycled materials, compost, and solid waste for all new buildings.
EXCEPTION:
Group R-3 and Group U Occupancies.
The storage area shall be designed to meet the needs of the occupancy, efficiency of pickup, and be available to occupants and haulers.
AMENDATORY SECTION(Amending WSR 20-01-090, filed 12/12/19, effective 7/1/20)
WAC 51-50-0503Section 503General building height and area limitations.
((503.1.4 Occupied roofs. A roof level or portion thereof shall be permitted to be used as an occupied roof provided the occupancy of the roof is an occupancy that is permitted by Table 504.4 for the story immediately below the roof. The area of the occupied roofs shall not be included in the building area as regulated by Section 506.
EXCEPTIONS:
1. The occupancy located on an occupied roof shall not be limited to the occupancies allowed on the story immediately below the roof where the building is equipped throughout with an automatic sprinkler system in accordance with Section 903.3.1.1 or 903.3.1.2 and occupant notification in accordance with Sections 907.5.2.1 and 907.5.2.3 is provided in the area of the occupied roof. Emergency voice/alarm communication system notification in accordance with Section 907.5.2.2 shall also be provided in the area of the occupied roof where such system is required elsewhere in the building.
 
2. Assembly occupancies shall be permitted on roofs of open parking spaces of Type I or Type II construction, in accordance with the exception to Section 903.2.1.6. ))
503.1.4.1 Enclosure of occupied roof areas. Elements or structures enclosing the occupied roof areas shall not extend more than 48 inches (1220 mm) above the surface of the occupied roof.
EXCEPTIONS:
1. Penthouses constructed in accordance with Section 1511.2 and towers, domes, spires, and cupolas constructed in accordance with Section 1511.5.
 
2. High rise buildings.
503.1.4.2 Guards. Occupied roofs shall have guards in accordance with Section 1015.2.
AMENDATORY SECTION(Amending WSR 21-06-035, filed 2/23/21, effective 3/26/21)
WAC 51-50-0504Section 504Building height and number of stories.
Table 504.3
Allowable Building Height in Feet Above Grade Planea
Occupancy Classification
Type of Construction
See
Footnotes
Type I
Type II
Type III
Type IV
Type V
A
B
A
B
A
B
A
B
C
HT
A
B
A, B, E, F, M, S, U
NSb
UL
160
65
55
65
55
65
65
65
65
50
40
S
UL
180
85
75
85
75
270
180
85
85
70
60
H-1, H-2, H-3, H-5
NSc,d
UL
160
65
55
65
55
120
90
65
65
50
40
S
 
 
 
 
 
 
 
 
 
 
 
 
H-4
NSc,d
UL
160
65
55
65
55
65
65
65
65
50
40
S
UL
180
85
75
85
75
140
100
85
85
70
60
I-1 Condition 1, I-3
NSd,e
UL
160
65
55
65
55
65
65
65
65
50
40
S
UL
180
85
75
85
75
180
120
85
85
70
60
I-1 Condition 2, I-2
NSd,e,f
UL
160
65
55
65
55
65
65
65
65
50
40
Si
UL
180
85
 
 
 
 
 
 
 
 
 
I-4
NSd,g
UL
160
65
55
65
55
65
65
65
65
50
40
S
UL
180
85
75
85
75
180
120
85
85
70
60
Rh
NSd
UL
160
65
55
65
55
65
65
65
65
50
40
S13D
60
60
60
60
60
60
60
60
60
60
50
40
S13R
60
60
60
60
60
60
60
60
60
60
60
60
S
UL
180
85
75
85
75
270
180
85
85
70
60
For SI: 1 foot = 304.8 mm.
UL = Unlimited; NS = Buildings not equipped throughout with an automatic sprinkler system; S = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.1; S13R = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.2.
 
a
See Chapters 4 and 5 for specific exceptions to the allowable height in this chapter.
 
b
See Section 903.2 for the minimum thresholds for protection by an automatic sprinkler system for specific occupancies.
 
c
New Group H occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.5.
 
d
The NS value is only for use in evaluation of existing building height in accordance with the International Existing Building Code.
 
e
New Group I-1 and I-3 occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.6. For new Group I-1 occupancies Condition 1, see Exception 1 of Section 903.2.6.
 
f
New and existing Group I-2 occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.6 and Section 1103.5 of the International Fire Code.
 
g
For new Group I-4 occupancies, see Exceptions 2 and 3 of Section 903.2.6.
 
h
New Group R occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.8.
 
i
I-1, Condition 2 Assisted living facilities licensed in accordance with chapter 388-78A WAC and residential treatment facilities as licensed by Washington state under chapter 246-337 WAC shall be permitted to use the allowable height above grade plane for Group R-2 occupancies.
Table 504.4
Allowable Number of Stories Above Grade Planea,b
Occupancy Classification
Type of Construction
See
Footnotes
Type I
Type II
Type III
Type IV
Type V
A
B
A
B
A
B
A
B
C
HT
A
B
A-1
NS
UL
5
3
2
3
2
3
3
3
3
2
1
S
UL
6
4
3
4
3
9
6
4
4
3
2
A-2
NS
UL
11
3
2
3
2
3
3
3
3
2
1
S
UL
12
4
3
4
3
18
12
6
4
3
2
A-3
NS
UL
11
3
2
3
2
3
3
3
3
2
1
S
UL
12
4
3
4
3
18
12
6
4
3
2
A-4
NS
UL
11
3
2
3
2
3
3
3
3
2
1
S
UL
12
4
3
4
3
18
12
6
4
3
2
A-5
NS
UL
UL
UL
UL
UL
UL
1
1
1
UL
UL
UL
S
UL
UL
UL
UL
UL
UL
UL
UL
UL
UL
UL
UL
B
NS
UL
11
5
3
5
3
5
5
5
5
3
2
S
UL
12
6
4
6
4
18
12
9
6
4
3
E
NS
UL
5
3
2
3
2
3
3
3
3
1
1
S
UL
6
4
3
4
3
9
6
4
4
2
2
F-1
NS
UL
11
4
2
3
2
3
3
3
4
2
1
S
UL
12
5
3
4
3
10
7
5
5
3
2
F-2
NS
UL
11
5
3
4
3
5
5
5
5
3
2
S
UL
12
6
4
5
4
12
8
6
6
4
3
H-1
NSc,d
1
1
1
1
1
1
NP
NP
NP
1
1
NP
S
 
 
 
 
 
 
1
1
1
 
 
 
H-2
NSc,d
UL
3
2
1
2
1
1
1
1
2
1
1
S
 
 
 
 
 
 
2
2
2
 
 
 
H-3
NSc,d
UL
6
4
2
4
2
3
3
3
4
2
1
S
 
 
 
 
 
 
4
4
4
 
 
 
H-4
NSc,d
UL
7
5
3
5
3
5
5
5
5
3
2
S
UL
8
6
4
6
4
8
7
6
6
4
3
H-5
NSc,d
4
4
3
3
3
3
2
2
2
3
3
2
S
 
 
 
 
 
 
3
3
3
 
 
 
I-1 Condition 1
NSd,e
UL
9
4
3
4
3
4
4
4
4
3
2
S
UL
10
5
4
5
4
10
7
5
5
4
3
I-1 Condition 2
NSd,e
UL
9
4
3
4
3
3
3
3
4
3
2
Si
UL
10
5
 
 
 
10
6
4
 
 
 
I-2
NSd,f
UL
4
2
1
1
NP
NP
NP
NP
1
1
NP
S
UL
5
3
 
 
 
7
5
1
 
 
 
I-3
NSd,e
UL
4
2
1
2
1
2
2
2
2
2
1
S
UL
5
3
2
3
2
7
5
3
3
3
2
I-4
NSd,g
UL
5
3
2
3
2
3
3
3
3
1
1
S
UL
6
4
3
4
3
9
6
4
4
2
2
M
NS
UL
11
4
2
4
2
4
4
4
4
3
1
S
UL
12
5
3
5
3
12
8
6
5
4
2
R-1h
NSd
UL
11
4
4
4
4
4
4
4
4
3
2
S13R
4
4
 
 
 
 
 
 
 
 
4
3
S
UL
12
5
5
5
5
18
12
8
5
4
3
R-2h
NSd
UL
11
4
4
4
4
4
4
4
4
3
2
S13R
4
4
4
 
 
 
 
 
 
 
4
3
 
S
UL
12
5
5
5
5
18
12
8
5
4
3
R-3h
NSd
UL
11
4
4
4
4
4
4
4
4
3
3
S13D
4
4
 
 
 
 
 
 
 
 
3
3
S13R
4
4
 
 
 
 
 
 
 
 
4
4
S
UL
12
5
5
5
5
18
12
5
5
4
4
R-4h
NSd
UL
11
4
4
4
4
4
4
4
4
3
2
S13D
4
4
 
 
 
 
 
 
 
 
3
2
S13R
4
4
 
 
 
 
 
 
 
 
4
3
S
UL
12
5
5
5
5
18
12
5
5
4
3
S-1
NS
UL
11
4
2
3
2
4
4
4
4
3
1
S
UL
12
5
3
4
3
10
7
5
5
4
2
S-2
NS
UL
11
5
3
4
3
4
4
4
4
4
2
S
UL
12
6
4
5
4
12
8
5
5
5
3
U
NS
UL
5
4
2
3
2
4
4
4
4
2
1
S
UL
6
5
3
4
3
9
6
5
5
3
2
UL = Unlimited; NP = Not permitted; NS = Buildings not equipped throughout with an automatic sprinkler system; S = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.1; S13R = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.2.
 
a
See Chapters 4 and 5 for specific exceptions to the allowable height in this chapter.
 
b
See Section 903.2 for the minimum thresholds for protection by an automatic sprinkler system for specific occupancies.
 
c
New Group H occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.5.
 
d
The NS value is only for use in evaluation of existing building height in accordance with the International Existing Building Code.
 
e
New Group I-1 and I-3 occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.6. For new Group I-1 occupancies Condition 1, see Exception 1 of Section 903.2.6.
 
f
New and existing Group I-2 occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.6 and Section 1103.5 of the International Fire Code.
 
g
For new Group I-4 occupancies, see Exceptions 2 and 3 of Section 903.2.6.
 
h
New Group R occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.8.
 
i
Group I-1, Condition 2 Assisted living facilities licensed in accordance with chapter 388-78A WAC and residential treatment facilities as licensed by Washington state under chapter 246-337 WAC shall be permitted to use the allowable number of stories for Group R-2 occupancies.
504.4.1 Stair enclosure pressurization increase. For Group R-1, R-2, and I-1 Condition 2 Assisted living facilities licensed under chapter 388-78A WAC and residential treatment facilities as licensed by Washington state under chapter 246-337 WAC located in buildings of Type VA construction equipped throughout with an approved automatic sprinkler system in accordance with Section 903.3.1.1, the maximum number of stories permitted in Section 504.4 may be increased by one provided the interior exit stairways and ramps are pressurized in accordance with Sections 909.6.3 and 909.20. Legally required standby power shall be provided in accordance with Sections 909.11 and ((2702.2.16))2702.17 for buildings constructed in compliance with this section and be connected to stairway shaft pressurization equipment, elevators and lifts used for accessible means of egress (if provided), elevator hoistway pressurization equipment (if provided) and other life safety equipment as determined by the authority having jurisdiction. For the purposes of this section, legally required standby power shall comply with 2020 NEC Section 701.12, options (C), (D), (E), (F), (H) or (J) or subsequent revised section number(s).
AMENDATORY SECTION(Amending WSR 20-01-090, filed 12/12/19, effective 7/1/20)
WAC 51-50-0505((Reserved.))Section 0505Mezzanines and equipment platforms.
505.1 General.Mezzanines shall comply with Section 505.2. Equipment platforms shall comply with Section 505.3.
EXCEPTION:
Lofts in Group R occupancy dwelling units and sleeping units shall be permitted to comply with Section 420.13, subject to the limitations in Section 420.13.1.
AMENDATORY SECTION(Amending WSR 20-01-090, filed 12/12/19, effective 7/1/20)
WAC 51-50-0506((Section 506Building area.))Reserved.
((Table 506.2
Allowable Area Factor (At = NS, S1, S13R, S13D or SM, as applicable) In Square Feeta,b
Occupancy Classification
See
Footnotes
Type of Construction
Type I
Type II
Type III
Type IV
Type V
A
B
A
B
A
B
A
B
C
HT
A
B
A-1
NS
UL
UL
15,500
8,500
14,000
8,500
45,000
30,000
18,750
15,000
11,500
5,500
S1
UL
UL
62,000
34,000
56,000
34,000
180,000
120,000
75,000
60,000
46,000
22,000
SM
UL
UL
46,500
25,500
42,000
25,500
135,000
90,000
56,250
45,000
34,500
16,500
A-2
NS
UL
UL
15,500
9,500
14,000
9,500
45,000
30,000
18,750
15,000
11,500
6,000
S1
UL
UL
62,000
38,000
56,000
38,000
180,000
120,000
75,000
60,000
46,000
24,000
SM
UL
UL
46,500
28,500
42,000
28,500
135,000
90,000
56,250
45,000
34,500
18,000
A-3
NS
UL
UL
15,500
9,500
14,000
9,500
45,000
30,000
18,750
15,000
11,500
6,000
S1
UL
UL
62,000
38,000
56,000
38,000
180,000
120,000
75,000
60,000
46,000
24,000
SM
UL
UL
46,500
28,500
42,000
28,500
135,000
90,000
56,250
45,000
34,500
18,000
A-4
NS
UL
UL
15,500
9,500
14,000
9,500
45,000
30,000
18,750
15,000
11,500
6,000
S1
UL
UL
62,000
38,000
56,000
38,000
180,000
120,000
75,000
60,000
46,000
24,000
SM
UL
UL
46,500
28,500
42,000
28,500
135,000
90,000
56,250
45,000
34,500
18,000
A-5
NS
UL
UL
UL
UL
UL
UL
UL
UL
UL
UL
UL
UL
S1
 
 
 
 
 
 
 
 
 
 
 
 
SM
 
 
 
 
 
 
 
 
 
 
 
 
B
NS
UL
UL
37,500
23,000
28,500
19,000
108,000
72,000
45,000
36,000
18,000
9,000
S1
UL
UL
150,000
92,000
114,000
76,000
432,000
288,000
180,000
144,000
72,000
36,000
SM
UL
UL
112,500
69,000
85,500
57,000
324,000
216,000
135,000
108,000
54,000
27,000
E
NS
UL
UL
26,500
14,500
23,500
14,500
76,500
51,000
31,875
25,500
18,500
9,500
S1
UL
UL
106,000
58,000
94,000
58,000
306,000
204,000
127,500
102,000
74,000
38,000
SM
UL
UL
79,500
43,500
70,500
43,500
229,500
153,000
95,625
76,500
55,500
28,500
F-1
NS
UL
UL
25,000
15,500
19,000
12,000
100,500
67,000
41,875
33,500
14,000
8,500
S1
UL
UL
100,000
62,000
76,000
48,000
402,000
268,000
167,500
134,000
56,000
34,000
SM
UL
UL
75,000
46,500
57,000
36,000
301,500
201,000
125,625
100,500
42,000
25,500
F-2
NS
UL
UL
37,500
23,000
28,500
18,000
151,500
101,000
63,125
50,500
21,000
13,000
S1
UL
UL
150,000
92,000
114,000
72,000
606,000
404,000
252,500
202,000
84,000
52,000
SM
UL
UL
112,500
69,000
85,500
54,000
454,500
303,000
189,375
151,500
63,000
39,000
H-1
NSc
21,000
16,500
11,000
7,000
9.500
7,000
10,500
10,500
10,000
10,500
7,500
NP
S1
 
 
 
 
 
 
 
 
 
 
 
 
H-2
NSc
21,000
16,500
11,000
7,000
9.500
7,000
10,500
10,500
10,000
10,500
7,500
3,000
S1
 
 
 
 
 
 
 
 
 
 
 
 
SM
 
 
 
 
 
 
 
 
 
 
 
 
H-3
NSc
UL
60,000
26,500
14,000
17,500
13,000
25,500
25,500
25,500
25,500
10,000
5,000
S1
 
 
 
 
 
 
 
 
 
 
 
 
SM
 
 
 
 
 
 
 
 
 
 
 
 
H-4
NSc,d
UL
UL
37,500
17,500
28,500
17,500
72,000
54,000
40,500
36,000
18,000
6,500
S1
UL
UL
150,000
70,000
114,000
70,000
288,000
216,000
162,000
144,000
72,000
26,000
SM
UL
UL
112,500
52,500
85,500
52,500
216,000
162,000
121,500
108,000
54,000
19,500
H-5
NSc,d
UL
UL
37,500
23,000
28,500
19,000
72,000
54,000
40,500
36,000
18,000
9,000
S1
UL
UL
150,000
92,000
114,000
76,000
288,000
216,000
162,000
144,000
72,000
36,000
SM
UL
UL
112,500
69,000
85,500
57,000
216,000
162,000
121,500
108,000
54,000
27,000
Occupancy Classification
See
Footnotes
Type of Construction
Type I
Type II
Type III
Type IV
Type V
A
B
A
B
A
B
A
B
C
HT
A
B
I-1
NSd, e
UL
55,000
19,000
10,000
16,500
10,000
54,000
36,000
18,000
18,000
10,500
4,500
S1
UL
220,000
76,000
40,000
66,000
40,000
216,000
144,000
72,000
72,000
42,000
18,000
SM
UL
165,000
57,000
30,000
49,500
30,000
162,000
108,000
54,000
54,000
31,500
13,500
I-2
NSd, f
UL
UL
15,000
11,000
12,000
NP
36,000
24,000
12,000
12,000
9,500
NP
S1
UL
UL
60,000
44,000
48,000
NP
144,000
96,000
48,000
48,000
38,000
NP
SM
UL
UL
45,000
33,000
36,000
NP
108,000
72,000
36,000
36,000
28,500
NP
I-3
NSd, e
UL
UL
15,000
10,000
10,500
7,500
36,000
24,000
12,000
12,000
7,500
5,000
S1
UL
UL
45,000
40,000
42,000
30,000
144,000
96,000
48,000
48,000
30,000
20,000
SM
UL
UL
45,000
30,000
31,500
22,500
108,000
72,000
36,000
36,000
22,500
15,000
I-4
NSd, g
UL
60.500
26,500
13,000
23,500
13,000
76,500
51,000
25,500
25,500
18,500
9,000
S1
UL
121,000
106,000
52,000
94,000
52,000
306,000
204,000
102,000
102,000
74,000
36,000
SM
UL
181,500
79,500
39,000
70,500
39,000
229,500
153,000
76,500
76,500
55,500
27,000
M
NS
UL
UL
21,500
12,500
18,500
12,500
61,500
41,000
25,625
20,500
14,000
9,000
S1
UL
UL
86,000
50,000
74,000
50,000
246,000
164,000
102,500
82,000
56,000
36,000
SM
UL
UL
64,500
37,500
55,500
37,500
184,500
123,000
76,875
61,500
42,000
27,000
R-1h
NSd
UL
UL
24,000
16,000
24,000
16,000
61,500
41,000
25,625
20,500
12,000
7,000
S13R
 
 
 
 
 
 
 
 
 
 
 
 
S1
UL
UL
96,000
64,000
96,000
64,000
246,000
164,000
102,500
82,000
48,000
28,000
SM
UL
UL
72,000
48,000
72,000
48,000
184,500
123,000
76,875
61,500
36,000
21,000
R-2h
NSd
UL
UL
24,000
16,000
24,000
16,000
61,500
41,000
25.625
20,500
12,000
7,000
S13R
S1
UL
UL
96,000
64,000
96,000
64,000
246,000
164,000
102,500
82,000
48,000
28,000
SM
UL
UL
72,000
48,000
72,000
48,000
184,500
123,000
76,875
61,500
36,000
21,000
R-3h
NSd
UL
UL
UL
UL
UL
UL
UL
UL
UL
UL
UL
UL
S13D
 
 
 
 
 
 
 
 
 
 
 
 
S13R
 
 
 
 
 
 
 
 
 
 
 
 
S1
 
 
 
 
 
 
 
 
 
 
 
 
SM
 
 
 
 
 
 
 
 
 
 
 
 
R-4h
NSd
UL
UL
24,000
16,000
24,000
16,000
61,500
41,000
25,625
20,500
12,000
7,000
S13D
 
 
 
 
 
 
 
 
 
 
 
 
S13R
 
 
 
 
 
 
 
 
 
 
 
 
S1
UL
UL
96,000
64,000
96,000
64,000
246,000
164,000
102,500
82,000
48,000
28,000
SM
UL
UL
72,000
48,000
72,000
48,000
184,500
123,000
76,875
61,500
36,000
21,000
S-1
NS
UL
48,000
26,000
17,500
26,000
17,500
76,500
51,000
31,875
25,500
14,000
9,000
S1
UL
192,000
104,000
70,000
104,000
70,000
306,000
204,000
127,500
102,000
56,000
36,000
SM
UL
144,000
78,000
52,500
78,000
52,500
229,500
153,000
95,625
76,500
42,000
27,000
S-2
NS
UL
79,000
39,000
26,000
39,000
26,000
115,500
77,000
48,125
38,500
21,000
13,500
S1
UL
316,000
156,000
104,000
156,000
104,000
462,000
308,000
192,500
154,000
84,000
54,000
SM
UL
237,000
117,000
78,000
117,000
78,000
346,500
231,000
144,375
115,500
63,000
40,500
U
NSi
UL
35,500
19,000
8,500
14,000
8,500
54,000
36,000
22,500
18,000
9,000
5,500
S1
UL
142,000
76,000
34,000
56,000
34,000
216,000
144,000
90,000
72,000
36,000
22,000
SM
UL
106,500
57,000
25,500
42,000
25,500
162,000
108,000
67,500
54,000
27,000
16,500
For SI: 1 square foot = 0.0929 m2.
UL = Unlimited; NP = Not permitted; NS = Buildings not equipped throughout with an automatic sprinkler system; S1 = Buildings a maximum of one story above grade plane equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.1; SM = Buildings two or more stories above grade plane equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.1; S13R = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.2; S13D = Buildings equipped throughout with an automatic sprinkler system installed in accordance with Section 903.3.1.3.
 
a
See Chapters 4 and 5 for specific exceptions to the allowable height in this chapter.
 
b
See Section 903.2 for the minimum thresholds for protection by an automatic sprinkler system for specific occupancies.
 
c
New Group H occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.5.
 
d
The NS value is only for use in evaluation of existing building area in accordance with the International Existing Building Code.
 
e
New Group I-1 and I-3 occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.6. For new Group I-1 occupancies Condition 1, see Exception 1 of Section 903.2.6.
 
f
New and existing Group I-2 occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.6 and Section 1103.5 of the International Fire Code.
 
g
For new Group I-4 occupancies, see Exceptions 2 and 3 of Section 903.2.6.
 
h
New Group R occupancies are required to be protected by an automatic sprinkler system in accordance with Section 903.2.8.
 
i
The maximum allowable area for a single-story nonsprinklered Group U greenhouse is permitted to be 9,000 square feet, or the allowable area shall be permitted to comply with Table C102.1 of Appendix C.))
AMENDATORY SECTION(Amending WSR 19-02-038, filed 12/26/18, effective 7/1/19)
WAC 51-50-0508Section 508Mixed use and occupancy.
((508.4.4.1 Construction. Required separations shall be fire barriers constructed in accordance with Section 707 or horizontal assemblies constructed in accordance with Section 711, or both, so as to completely separate adjacent occupancies. Mass timber elements serving as fire barriers or horizontal assemblies to separate occupancies in Type IV-B or IV-C construction shall be separated from the interior of the building with an approved thermal barrier consisting of a minimum of 1/2 inch (12.7 mm) gypsum board or a material that is tested in accordance with and meets the acceptance criteria of both the Temperature Transmission Fire Test and the Integrity Fire Test of NFPA 275.))
508.5.1 Limitations. The following shall apply to live/work areas:
1. The live/work unit is permitted to be not greater than 3,000 square feet (279 m) in area.
2. The nonresidential area is permitted to be not more than 50 percent of the area of each live/work unit.
3. The nonresidential area function shall be limited to the first or main floor only of the live/work unit.
AMENDATORY SECTION(Amending WSR 19-02-038, filed 12/26/18, effective 7/1/19)
WAC 51-50-0509Section 509Incidental uses.
((509.4.1.1 Type IV-B and IV-C construction. Where Table 509 specifies a fire-resistance-rated separation, mass timber elements serving as fire barriers or a horizontal assembly in Type IV-B or IV-C construction shall be separated from the interior of the incidental use with an approved thermal barrier consisting of a minimum of 1/2 inch (12.7 mm) gypsum board or a material that is tested in accordance with and meets the acceptance criteria of both the Temperature Transmission Fire Test and the Integrity Fire Test of NFPA 275.))
Table 509
Incidental Uses
Room or Area
Separation and/or Protection
Dry type transformers over 112.5 kVA and required to be in a fire resistant room per NEC (NFPA 70) Section 450.21 (B)1
1 hour or provide automatic sprinkler system
1
Dry type transformers rated over 35,000 volts and oil-insulated transformers shall be installed in a transformer vault complying with NFPA 70.
(Remainder of table unchanged)
AMENDATORY SECTION(Amending WSR 20-21-021, filed 10/9/20, effective 11/9/20)
WAC 51-50-0510Section 510Special provisions.
510.2 Horizontal building separation allowance. A building shall be considered as separate and distinct buildings for the purpose of determining area limitations, continuity of fire walls, limitation of number of stories and type of construction where ((all of)) the following conditions are met:
1. The buildings are separated with a horizontal assembly having a fire-resistance rating of not less than 3 hours. Where vertical offsets are provided as part of a horizontal assembly, the vertical offset and the structure supporting the vertical offset shall have a fire-resistance rating of not less than 3 hours.
2. The building below, including the horizontal assembly, is of Type IA construction.
3. Shaft, stairway, ramp and escalator enclosures through the horizontal assembly shall have not less than a 2-hour fire-resistance rating with opening protective in accordance with Section 716.
EXCEPTION:
Where the enclosure walls below the horizontal assembly have not less than a 3-hour fire-resistance rating with opening protectives in accordance with Section 716, the enclosure walls extending above the horizontal assembly shall be permitted to have a 1-hour fire-resistance rating provided that the following conditions are met:
 
1. The building above the horizontal assembly is not required to be of Type I construction.
 
2. The enclosure connects fewer than four stories; and
 
3. The enclosure opening protective above the horizontal assembly have a fire protection rating of not less than 1 hour.
 
((4. Interior exit stairways located within the Type IA building are permitted to be of combustible materials where both of the following requirements are met:
 
4.1. The building above the Type IA building is of Type III, IV, or V construction.
 
4.2. The stairway located in the Type IA building is enclosed by 3-hour fire-resistance-rated construction with opening protectives in accordance with Section 716.))
4. Interior exit stairways located within the Type IA building are permitted to be of combustible materials where both of the following requirements are met:
4.1. The building above the Type IA building is of Type III, IV, or V construction.
4.2. The stairway located in the Type IA building is enclosed by 3-hour fire-resistance-rated construction with opening protectives in accordance with Section 716.
5. The building or buildings above the horizontal assembly shall be permitted to have ((multiple)) Group A ((occupancy uses, each with an occupant load of less than 300, or Group B, Group I-1, Condition 2 licensed care facilities)), B, M, R, or S occupancies.
((5.))6. The building below the horizontal assembly shall be protected throughout by an approved automatic sprinkler system in accordance with Section 903.3.1.1, and shall be permitted to be any occupancy allowed by this code except Group H.
((6.))7. The maximum building height in feet (mm) shall not exceed the limits set forth in Section 504.3 for the building having the smaller allowable height as measured from the grade plane. ((Group I-1, Condition 2 licensed care facilities shall be permitted to use the values for maximum height in feet for Group R-2 occupancies.
510.5 Group R-1 and R-2 buildings of Type IIIA construction. For buildings of Type IIIA construction in Groups R-1 and R-2, the maximum allowable height in Table 504.3 shall be increased by 10 feet and the maximum allowable number of stories in Table 504.4 shall be increased by one foot where the first floor assembly above the basement has a fire-resistance rating of not less than 3 hours and the floor area is subdivided by 2-hour fire-resistance-rated fire walls into areas of not more than 3,000 square feet (279 m2).))
AMENDATORY SECTION(Amending WSR 19-02-038, filed 12/26/18, effective 7/1/19)
WAC 51-50-0601((Section 601General.))Reserved.
((Table 601
Fire-resistance Rating Requirements for Building Elements (hours)
Building Element
Type I
Type II
Type III
Type IV
Type V
A
B
A
B
A
B
A
B
C
HT
A
B
Primary structural framef (see Section 202)
3a
2a
1
0
1b
0
3a
2a
2a
HT
1
0
Bearing walls
 
 
 
 
 
 
 
 
 
 
 
 
Exteriore, f
3
2
1
0
2
2
3
2
2
2
1
0
Interior
3a
2a
1
0
1
0
3
2
2
1/HT
1
0
Nonbearing walls and partitions exterior
See Table 602
Nonbearing walls and partitions interiord
0
0
0
0
0
0
0
0
0
See Section 602.4.4.6
0
0
Floor construction and associated secondary members (see Section 202)
2
2
1
0
1
0
2
2
2
HT
1
0
Roof construction and associated secondary members (see Section 202)
1 1/2b
1b,c
1b,c
0c
1b,c
0
1 1/2
1
1
HT
1b,c
0
For SI: 1 foot = 304.8 mm.
 
a
Roof supports: Fire-resistance ratings of primary structural frame and bearing walls are permitted to be reduced by 1 hour where supporting a roof only.
 
b
Except in Groups F-1, H, M and S-1 occupancies, fire protection of structural members in roof construction shall not be required, including protection of primary structural frame members, roof framing and decking where every part of the roof construction is 20 feet or more above any floor immediately below. Fire-retardant-treated wood members shall be allowed to be used for such unprotected members.
 
c
In all occupancies, heavy timber complying with Section 2304.11 shall be allowed where a 1-hour or less fire-resistance rating is required.
 
d
Not less than the fire-resistance rating required by other sections of this code.
 
e
Not less than the fire-resistance rating based on fire separation distance (see Table 602).
 
f
Not less than the fire-resistance rating as referenced in Section 704.10.))
AMENDATORY SECTION(Amending WSR 20-21-021, filed 10/9/20, effective 11/9/20)
WAC 51-50-0602Section 602Construction classification.
((Table 602
Fire-resistance Rating Requirements for Exterior Walls Based on Fire Separation Distancea,d,g
Fire Separation Distance = X (feet)
Type of Construction
Occupancy Group He
Occupancy Group F-1, M, S-1f
Occupancy Group A, B, E, F-2, I, Ri,
S-2, Uh
X < 5b
All
3
2
1
5 ≤ X < 10
IA, IVA
3
2
1
 
Others
2
1
 
10 ≤ X < 30
IA, IB, IVA, IVB
2
1
1c
 
IIB, VB
1
0
0
 
Others
1
1
1c
X ≥ 30
All
0
0
0
</
For SI: 1 foot = 304.8 mm.
 
a
Load-bearing exterior walls shall also comply with the fire-resistance rating requirements of Table 601.
 
b
See Section 706.1.1 for party walls.
 
c
Open parking garages complying with Section 406 shall not be required to have a fire-resistance rating.
 
d
The fire-resistance rating of an exterior wall is determined based upon the fire separation distance of the exterior wall and the story in which the wall is located.
 
e
For special requirements for Group H occupancies, see Section 415.6.
 
f
For special requirements for Group S aircraft hangars, see Section 412.3.1.
 
g
Where Table 705.8 permits nonbearing exterior walls with unlimited area of unprotected openings, the required fire-resistance rating for the exterior walls is 0 hours.
 
h
For a building containing only a Group U occupancy private garage or carport, the exterior wall shall not be required to have a fire-resistance rating where the fire separation distance is 5 feet (1523 mm) or greater.
 
i
For a Group R-3 building of Type II-B or Type V-B construction, the exterior wall shall not be required to have a fire-resistance rating where the fire separation distance is 5 feet (1523 mm) or greater.