Newcastle Building Department
WSEC-R 2021 energy code compliance resources for builders and contractors in Newcastle, King County.
Building Department
Newcastle Community Development/Permits
- Phone
- (425) 649-4444
- Address
- 12835 Newcastle Way, Ste 200, Newcastle, WA 98056
- Hours
- M-F 8am-5pm
- Website
- https://newcastlewa.gov
- Portal
- Online permit portal →
- Notes
- uses MyBuildingPermit.com
Last verified: 2026-04-19
Submittal notes
These apply at King County County level — verify city-specific items directly with Newcastle Community Development/Permits.
- King County: King County requires a '2021 Energy Compliance Summary Sheet' specifying exact HVAC equipment specs (mini-splits ≥10.0 HSPF, air-to-water heat pumps ≥3.2 COP at 47°F), hot water loop volumes (≤16 oz between source and fixture), and solar-ready provisions.
- Seattle: Seattle: Third-party blower door test results must be physically posted near the electrical panel before final inspection.
- Bellevue: Bellevue layers the 2023 Washington Cities Electrical Code on top of WSEC-R 2021 — additional lighting budget calculations and heat system sizing forms are required beyond other MBP-consortium jurisdictions.
- Redmond: Redmond requires environmental checklist and critical areas report (SEPA) clearance before the building permit can issue.
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 Newcastle Community Development/Permits.
Start your WSEC compliance check →