This standard is mandatory for all covered buildings and state campus district energy systems located in the state of Washington. Multifamily residential buildings exceeding 50,000 square feet of gross floor area, excluding the parking garage areas, may seek early adopter incentives by voluntarily complying with the applicable energy use intensity target consistent with RCW 19.27A.220.

This standard applies to existing buildings, portions of buildings, and building complexes, including the envelope and all systems in the building, state campus district energy systems, and campus district energy systems. Owners of a state campus district energy system must develop a decarbonization plan that provides a strategy for up to 15 years for the decarbonization of the district energy system. Owners of a campus district energy system may opt-in to compliance with the standard through the alternative decarbonization plan compliance pathway. Participating campuses must comply with all of the decarbonization plan requirements in accordance with Normative Annex W. This standard excludes industrial and agricultural processes in buildings for which the energy targets do not include those processes.