Washington State Energy Code Help: Homes, ADUs, Additions
The Washington State Energy Code (WSEC-R) sets how well your home must be insulated, sealed, heated, and ventilated before a permit is issued. Build Sherpas builds compliance into your plans, so forms, credits, and drawing details match when you submit. No guessing, no surprise corrections.
What the Energy Code Means for Your Project
Applies to homes, ADUs/DADUs, additions, and remodels
Washington has one of the strictest residential energy codes in the country. It comes down to three things:
Minimum specs: insulation, window performance, and other basics your plans must show.
Energy credits: extra efficiency measures you pick from a menu, like heat pumps, better windows, and extra air sealing. Bigger homes need more.
Testing: most new homes and many additions need a blower door (air leakage) test before final inspection.
How It Works
1. Quick call or form
Tell us about the project by phone or through the contact form.
2. Path and credits
We recommend how to comply and which credits to use.
3. Plans and forms
Energy details go into your permit set.
4. Submit and respond
5. Test and close out
Test and close out: we help you book a blower door air leak test with WA Blower Door before final inspection.