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Senate clears bill to allow detached ADUs in rural areas with limits on size, siting and water monitoring

Legislative Review · March 3, 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

The Senate on Tuesday passed House Bill 1345 to permit one detached accessory dwelling unit (ADU) per rural parcel subject to strict limits (no larger than 1,296 square feet; located within 150 feet of the main home; share driveway; meet water/septic rules); vote was 33-15 with 1 excused and the bill now heads to the governor's desk.

The Washington Senate on Tuesday approved House Bill 1345, a measure to let counties planning under the Growth Management Act authorize one detached accessory dwelling unit (ADU) per parcel in rural areas outside urban growth areas, subject to size, siting and infrastructure limits.

Under the bill, detached ADUs must be no larger than 1,296 square…

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