Spokane County Washington Energy Code Compliance
WSEC-R 2021 compliance information for builders and contractors in Spokane County.
Code environment
Climate Zone
CZ5
Eastern Washington — stricter insulation and air-sealing minimums apply.
Wall min R-20 or R-13+5ci · Ceiling min R-49 · Window max U-0.28 (WAC 51-11R-40202)
Radon Zone
Zone 1
High radon potential — passive sub-slab depressurization system required under WAC 51-51-60101 (Appendix AF).
Learn more →County building department
The county building department handles permits for unincorporated areas. Cities within the county may have their own permit offices — see below.
Authority Having Jurisdiction (AHJ)
Spokane County Building & Planning Department
- Phone
- (509) 477-3675
- Address
- 1026 W Broadway Avenue, 1st Floor, Spokane, WA 99260
- Hours
- M-Th 7:30am-4pm F 7:30am-noon
Last verified: 2026-04-19
Cities with their own building department
These cities have an independent permit office. If your project is inside city limits, contact the city — not the county — for permits.
Ready to check your compliance?
Answer a few questions about your project and get a complete R406 credit summary you can submit with your permit application.
Start your WSEC compliance check →Typical project costs in Spokane County
Coming soon as we gather receipt data from local contractors.
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