Mercer Island Building Department
WSEC-R 2021 energy code compliance resources for builders and contractors in Mercer Island, King County.
Building Department
Mercer Island Community Planning & Department
- Phone
- (206) 275-7605
- Address
- 9611 SE 36th St, Mercer Island, WA 98040
- Hours
- M-F 8am-5pm
- Portal
- Online permit portal →
- Notes
- uses MyBuildingPermit.com
Last verified: 2026-04-19
Code environment
Climate Zone
CZ4
Western WA — moderate climate requirements.
Ready to check your compliance?
wsec.ai generates a complete R406 credit summary you can submit with your permit application to Mercer Island Community Planning & Department.
Start your WSEC compliance check →