Washington ADU Laws and Permits: A Comprehensive Resource
Statutory Requirements for ADUs in Washington State Since HB 1337 became effective in July 2023, state law (RCW 36.70A.680 and 36.70A.681) mandates that all local governments under Washington’s Growth Management Act (GMA) — including all counties (within unincorporated urban growth areas) and cities, regardless of population size — must update their regulations to comply with …
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