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 — east of the Cascade crest.
Wall min R-20 cavity + R-5 continuous, or R-13 cavity + R-10 continuous · Ceiling min R-60 · Window max U-0.30 · WAC 51-11R-40213, Table R402.1.3
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
Submittal notes
- Spokane City + Spokane County: Spokane City and Spokane County both require 2021 Duct Leakage Affidavits for new construction AND existing-home remodels before final occupancy — note in the submittal package that the affidavit will be provided at final.
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.
Airway Heights
Airway Heights Building Department
- Phone
- (509) 244-5578
- Address
- 1208 S Lundstrom St, Airway Heights, WA 99001
- Hours
- M-F 8am-5pm
- Website
- https://www.cawh.org/
Last verified: 2026-04-19
Cheney
Cheney Building Department
- Phone
- (509) 498-9240
- Address
- 112 Anderson Rd, Cheney, WA 99004
- Hours
- M-F 8am-5pm
Last verified: 2026-04-19
Liberty Lake
Liberty Lake Planning & Building
- Phone
- (509) 755-6700
- Address
- 22710 E Country Vista Dr, Liberty Lake, WA 99019
- Hours
- M-F 8am-5pm
Last verified: 2026-04-19
Medical Lake
Medical Lake Building Department
- Phone
- (509) 565-5000
- Address
- 124 S Lefevre St, Medical Lake, WA 99022
- Hours
- M-F 8am-5pm
- Website
- https://medical-lake.org/
Last verified: 2026-04-19
Spokane
Spokane Business & Development Services
- Phone
- (509) 625-6300
- Address
- 808 W Spokane Falls Blvd, Spokane, WA 99201
- Hours
- M-F 8am-5pm
- Notes
- first-class city
Last verified: 2026-04-19
Spokane Valley
Spokane Valley Permit Center
- Phone
- (509) 720-5240
- Address
- 10210 E Sprague Ave, Spokane Valley, WA 99206
- Hours
- M-F 8am-5pm
Last verified: 2026-04-19
Not listed? Your project is in unincorporated Spokane County — use the county building department above.
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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
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