Mill Creek Building Department
WSEC-R 2021 energy code compliance resources for builders and contractors in Mill Creek, Snohomish County.
Building Department
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
Submittal notes
These apply at Snohomish County County level — verify city-specific items directly with Mill Creek Community Development.
- 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.
Code environment
Climate Zone
CZ4
Western WA — moderate climate requirements.
Ready to check your compliance?
wsec.ai generates a complete R406 credit summary you can submit with your permit application to Mill Creek Community Development.
Start your WSEC compliance check →