Snohomish County Washington Energy Code Compliance
WSEC-R 2021 compliance information for builders and contractors in Snohomish County.
Code environment
Climate Zone
CZ4
Western Washington — west of the Cascade crest, marine climate.
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)
Snohomish County Planning and Development Services
- Phone
- (425) 388-3311
- Address
- 3000 Rockefeller Ave, Everett, WA 98201
- Hours
- M-F 8am-5pm Th 10am-5pm
- Notes
- paperless; all applications electronic via PDS Permit Portal
Last verified: 2026-04-19
Submittal notes
- Everett: Everett requires cross-sections and framing plans to explicitly show whole-house ventilation duct routing, exhaust outlet locations, and crawl space ventilation calculations — R406 energy credit text must also appear on the architectural drawings, not only on the prescriptive worksheet.
- Snohomish County: Snohomish County: Native Growth Protection Area (NGPA) boundaries must be marked on site plans alongside WSEC-R calculations.
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.
Edmonds
Edmonds Development Services Department
- Phone
- (425) 771-0220
- Address
- 121 5th Ave N, Edmonds, WA 98020
- Hours
- M-F 8am-4:30pm
- Website
- https://www.edmondswa.gov/
- Portal
- Online permit portal →
- Notes
- uses MyBuildingPermit.com
Last verified: 2026-04-19
Everett
Everett Permit Services
- Phone
- (425) 257-8810
- Address
- 2930 Wetmore Ave, Everett, WA 98201
- Hours
- M-F 8am-5pm
- Notes
- first-class city
Last verified: 2026-04-19
Mill Creek
Mill Creek Community Development
- Phone
- (425) 551-7254
- Address
- 15720 Main St, Mill Creek, WA 98012
- Hours
- M-F 8am-5pm
- Portal
- Online permit portal →
- Notes
- uses MyBuildingPermit.com
Last verified: 2026-04-19
Woodway
Woodway Permits
- Phone
- (206) 542-4443
- Address
- 23920 113th Pl W, Woodway, WA 98026
- Hours
- M-F 8am-5pm
- Notes
- uses MyBuildingPermit.com
Last verified: 2026-04-19
Not listed? Your project is in unincorporated Snohomish 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 Snohomish County
Coming soon as we gather receipt data from local contractors.
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