Housing

HB 1345 restricts detached accessory dwelling units (ADUs) - separate small homes on the same lot as a main house - outside urban growth areas in Washington counties. It requires counties to limit each parcel to one ADU, set size limits (max 1,296 sq ft), mandate water metering and sewage capacity documentation, and require ADUs to be within 150 feet of the main home. Counties must enforce penalties for unpermitted ADUs (including $1,000 fines, removal orders, and 3-year permit bans) and track ADU permits for land-use planning updates. The bill applies only to counties allowing such ADUs outside urban areas, not affecting existing urban or rural ADU rules.

SB 5587 mandates that the Washington center for real estate research produce biennial reports, starting in 2026, analyzing existing housing units and needs across various income levels in each county. These reports will track each county's progress in addressing housing gaps and meeting emergency housing needs. The bill also amends the Public Works Board's criteria for financial assistance. It requires the board to prioritize public works projects that promote infill development or increase affordable housing in counties identified in these reports as having a gap between existing housing and housing needs.