Washington Zoning & Land Use Guide
Last updated: Verified:
Comprehensive guide to Washington zoning laws, building codes, and land use regulations.
Key Facts
- Building Code: WA State Building Code (based on 2021 IBC)
- State ADU Law: Yes — ADU-friendly
- ADU Details: HB 1337 (2023) requires cities and counties planning under the GMA to allow at least two ADUs per single-family lot.
Official Sources
Cities in Washington
Disclaimer: The information on this website is provided for general informational purposes only and does not constitute legal, financial, or professional advice. Always verify current requirements with your local planning department.