King County energy code

2021Washington State Energy Code

The full code text of residential provisions of the 2021 Washington State Energy Code (WSEC) is available on the State Building Code Council website.

The WSEC is split into two sections, one for residential buildings and one for commercial buildings. Pay close attention to the definitions below to determine which provisions to use.

2021 Washington State Energy Code - Residential Provisions

Use Residential Provisions for the following:

1. Single family homes
2. Duplexes
3. Townhouses
4. Group R-3 occupancy areas in buildings three stories or less in height above grade plane whose dwelling units are accessed directly from the exterior
5. Group R-2 occupancy areas in buildings three stories or less in height above grade plane whose dwelling units are accessed directly from the exterior
6. Accessory structures to residential buildings

2021 Washington State Energy Code - Commercial Provisions

Use Commercial Provisions for the following:

1. Group R-2 buildings with dwelling units accessed from interior corridors or other interior spaces
2. All other buildings not defined as residential above