Statewide
Washington ADU and Middle Housing Changes Explained for Homeowners
What HB 1337 and HB 1110 changed, and why the answer for your lot still depends on your city's current rules.
Last reviewed October 30, 2026
Housing & City Guides
What Washington's housing laws mean for existing homes and backyards, with links to the official sources.
Washington State
City Guides
Each city applies the state laws through its own code.
City guides are coming soon. Send us your address and we'll check the current rules for your property.
Don't See Your City?
Send us the address. We'll look at the rules that apply to your lot.