Bothell Building Department

WSEC-R 2021 energy code compliance resources for builders and contractors in Bothell, King County.

Building Department

Bothell Community Development Department

Last verified: 2026-04-19

Code environment

Climate Zone

CZ4

Western WA — moderate climate requirements.

Radon Zone

Zone 2

Moderate potential — mitigation recommended.

Ready to check your compliance?

wsec.ai generates a complete R406 credit summary you can submit with your permit application to Bothell Community Development Department.