Yakima County Washington Energy Code Compliance
WSEC-R 2021 compliance information for builders and contractors in Yakima 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)
Yakima County Public Services Department
- Phone
- (509) 574-2300
- Address
- 128 North Second Street, Yakima, WA 98901
- Hours
- M-F 8am-5pm
Last verified: 2026-04-19
Submittal notes
- Yakima County: Yakima County: Rural ADU rules and water availability requirements differ materially from urban projects — confirm water availability and ADU-specific code sections before permit submittal.
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.
Sunnyside
Sunnyside Building Division
- Phone
- (509) 837-4229
- Address
- 818 E Edison Ave, Sunnyside, WA 98944
- Hours
- M-F 8am-5pm
Last verified: 2026-04-19
Toppenish
Toppenish Building Official
- Phone
- (509) 865-7318
- Address
- 21 W 1st Ave, Toppenish, WA 98948
- Hours
- M-F 8am-5pm
- Website
- https://cityoftoppenish.us/
- Notes
- also services Granger
Last verified: 2026-04-19
Wapato
Wapato Building Inspector
- Phone
- (509) 877-9727
- Address
- 205 E 3rd St, Wapato, WA 98951
- Hours
- M-F 8am-5pm
- Website
- https://wapato-city.org/
Last verified: 2026-04-19
Yakima
Yakima Building Division
- Phone
- (509) 575-6126
- Address
- 129 N 2nd St, Yakima, WA 98901
- Hours
- M-F 8am-5pm
- Notes
- first-class city
Last verified: 2026-04-19
Not listed? Your project is in unincorporated Yakima 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 Yakima County
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