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Committee reviews bill allowing detached ADUs in some rural areas with conditions

Washington State Senate Housing Committee · January 21, 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

SB 5,470 would permit counties to allow detached accessory dwelling units outside urban growth areas where limited by water/septic and siting rules; proponents said ADUs increase rural housing options while opponents urged careful calibration on density and reporting to avoid unintended impacts.

Senate Bill 5,470 (proposed substitute) would allow counties to permit detached accessory dwelling units (ADUs) outside urban growth areas if those ADUs meet statutory limits such as one ADU per parcel, site proximity (sited within 150 feet of the principal unit), water supply and septic documentation, and reporting requirements to Commerce…

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