Skagit County Washington Energy Code Compliance
WSEC-R 2021 compliance information for builders and contractors in Skagit 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)
Skagit County Planning and Development Services
- Phone
- (360) 336-9410
- Address
- 1800 Continental Place, Mount Vernon, WA 98273
- Hours
- M-F 8am-4:30pm
Last verified: 2026-04-19
Submittal notes
- Skagit County: Skagit County recently migrated to Tyler Technologies' Civic Access portal — allow extra time if unfamiliar with the new system, which uses a 'Decision Engine' for permit selection.
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.
Anacortes
Anacortes Building Department
- Phone
- (360) 293-1942
- Address
- 904 6th St, Anacortes, WA 98221
- Hours
- M-F 8am-5pm
Last verified: 2026-04-19
Burlington
Burlington Building Department
- Phone
- (360) 755-0077
- Address
- 833 S Spruce St, Burlington, WA 98233
- Hours
- M-F 8am-5pm
Last verified: 2026-04-19
Mount Vernon
Mount Vernon Development Services Department
- Phone
- (360) 336-6214
- Address
- 910 Cleveland Ave, Mount Vernon, WA 98273
- Hours
- M-F 8am-5pm
- Portal
- Online permit portal →
- Notes
- uses SmartGov
Last verified: 2026-04-19
Sedro-Woolley
Sedro-Woolley Building Department
- Phone
- (360) 855-0771
- Address
- 325 Metcalf St, Sedro-Woolley, WA 98284
- Hours
- M-F 8am-5pm
Last verified: 2026-04-19
Not listed? Your project is in unincorporated Skagit 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 Skagit County
Coming soon as we gather receipt data from local contractors.
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