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Panelists and counties back HB 1345 to allow detached ADUs outside urban growth areas with guardrails

Washington State Senate Housing Committee · February 4, 2026
AI-Generated Content: All content on this page was generated by AI to highlight key points from the meeting. For complete details and context, we recommend watching the full video. so we can fix them.

Summary

House Bill 1345, which would allow detached accessory dwelling units outside urban growth areas under specified development limits and permitting guardrails, drew broad support from builders, county officials, policy groups and housing advocates who said the measure provides a narrow, workable tool for rural housing.

The Senate Housing Committee on Feb. 4 heard House Bill 1345, a measure that would permit detached accessory dwelling units (ADUs) outside urban growth areas in counties that choose to allow them, provided counties adopt development regulations and safeguards.

Staff summarized key guardrails: no parcel may have more than one ADU (attached or detached); metering of water withdrawals for each dwelling unit; documentation that septic or sewer systems can handle additional demand; a maximum gross floor area of 1,296 square feet for detached ADUs; requirement that detached ADUs share driveway access with the…

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