Grant County Washington Energy Code Compliance
WSEC-R 2021 compliance information for builders and contractors in Grant 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 2
Moderate radon potential — radon-resistant construction recommended but not mandated by state code.
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)
Grant County Development Services
- Phone
- (509) 754-2011
- Address
- 264 West Division Ave, Ephrata, WA 98823
- Hours
- M-F 8am-5pm
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.
Ephrata
Ephrata Building Department
- Phone
- (509) 754-6964
- Address
- 121 Alder St SW, Ephrata, WA 98823
- Hours
- M-F 8am-5pm
- bcox@ephrata.org
Last verified: 2026-04-19
George
George Building Official
- Phone
- (509) 785-5081
- Address
- 102 Richmond Ave, George, WA 98824
- Hours
- M-F 8am-5pm
Last verified: 2026-04-19
Moses Lake
Moses Lake Building Division
- Phone
- (509) 766-9236
- Address
- 321 S Balsam St, Moses Lake, WA 98837
- Hours
- M-F 8am-5pm
Last verified: 2026-04-19
Quincy
Quincy Building Official
- Phone
- (509) 787-3523
- Address
- 104 B St SW, Quincy, WA 98848
- Hours
- M-F 8am-5pm
Last verified: 2026-04-19
Royal City
Royal City Public Works
- Phone
- (509) 346-2263
- Address
- 445 Camelia St NE, Royal City, WA 99357
- Hours
- M-F 8am-5pm
- Website
- https://www.royalcitywa.org/
Last verified: 2026-04-19
Not listed? Your project is in unincorporated Grant County — use the county building department above.
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 Grant County
Coming soon as we gather receipt data from local contractors.
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