Washington · WA
Washington residential & ADU permit data
The Puget Sound middle-housing surge
Housing law
Washington's HB 1337 (2023) requires cities to allow at least two ADUs per lot in urban growth areas, bans owner-occupancy requirements, and limits parking and impact fees.
HB 1110 (2023) ends single-family-only zoning in larger cities, requiring duplex-to-sixplex middle housing scaled by city size, with Puget Sound cities phasing in compliance from 2025.
HB 1337 (ADUs)HB 1110 (middle housing)
Jurisdictions we cover
Seattle
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Sourced from Seattle's license-free open-data portal plus Tacoma and Bellevue feeds.
Informational only, not legal advice. Housing law changes — verify current statutes before relying on this.