Washington Zoning & Land Use Laws
Zoning regulations, ADU laws, short-term rental rules, and land use policies for Washington. Source-cited from state legislation and municipal codes.
Total Cities
281
Total Counties
39
ADU State Law
Yes
Lot Split Law
No state law
Cottage Food Law
Yes
Cities With Data
3
Washington ADU Law
Washington has a statewide ADU law (Washington House Bill 1337 (HB 1337) — Expanding Housing Options Through ADUs). See the official source for key provisions and current requirements.
View full WashingtonADU law details →Cottage Food Law
Washington has a cottage food law. See your state's official agriculture or health department website for current regulations and permit requirements.
State Preemption Active
Washington state law preempts local zoning ordinances in several areas. Local governments cannot enact rules stricter than the state baseline.
Learn about Washingtonzoning preemption →Recent Legislative Changes
Washington Cities with Zoning Data
Source: Washington House Bill 1337 (HB 1337) — Expanding Housing Options Through ADUs. Last verified April 5, 2026. View source