You must meet the requirements …
in this section:
Provide fixed stairs where required
Provide stairs that minimize hazards
Provide handrails and stair railings
This rule does not apply to:
♦ Stairs used exclusively for fire exit purposes
♦ Construction operations (See WAC 296-24-76503 for the specifications for the safe design and construction of fixed general industrial stairs.)
♦ Private buildings or residences
♦ Articulated stairs (for example, stairs used at a marina)
♦ Nonindustrial and monumental stairs are excluded as they are not industrial stairs; however, when public and private building steps are located at loading or receiving docks, in maintenance areas, etc., or are used exclusively by employees, the requirements of this rule must apply.
The introduction has important information about building, electrical and fire codes that may apply to you in addition to WISHA rules. See "How do the WISHA rules relate to building, fire, and electrical codes" in the introduction section of this book.