Home Battery Storage Permit Requirements in Seattle, WA (2025)
Last updated: June 2025
Seattle, WA Bottom Line: Seattle requires both a state L&I electrical permit (file at lni.wa.gov first) AND a city SDCI (Seattle Department of Construction and Inspections) permit. Both must be obtained before work begins. Combined fee: $275–$475. SDCI review: 1–3 weeks. Seattle uses the 2023 NEC — one of the most current code editions in the country.
How the Seattle, WA Permit Process Works
Home battery storage installations in Seattle, WA require an electrical permit. Seattle requires both a state L&I electrical permit (file at lni.wa.gov first) AND a city SDCI (Seattle Department of Construction and Inspections) permit. Both must be obtained before work begins. Combined fee: $275–$475. SDCI review: 1–3 weeks. Seattle uses the 2023 NEC — one of the most current code editions in the country.
What You Need to Submit
- Permit application through the local permit portal
- Single-line electrical diagram your installer prepares
- Equipment spec sheets with UL 9540 listing
- Licensed electrical contractor info with state license number
- Site plan showing battery location and clearances
Tips for Fast Approval in Seattle, WA
- Use an installer experienced with Seattle, WA permits specifically
- Submit a complete package the first time to avoid resubmission delays
- Confirm the permit number before allowing installation to start
- Schedule inspection promptly after installation is complete
FAQ
See the bottom line section above for current typical review times. Your installer can give you a current estimate based on their recent project experience in Seattle, WA.
Most reputable installers handling projects in Seattle, WA file permits as part of their service. Confirm this is included in your quote and ask for the permit number once issued.
Informational only. Requirements change. Always verify with the local building authority before starting any project.