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Committee hears bill to authorize limited attached ADU development outside urban growth areas with safeguards
Summary
Senate Bill 5470 would allow counties to permit attached and, under conditions, detached accessory dwelling units (ADUs) outside urban growth areas with limits on number, water/septic requirements, proximity and reporting; county and industry witnesses said the bill provides clarity and safeguards while allowing modest rural housing increases.
Senate Bill 5470, which would establish limitations on attached accessory dwelling units (ADUs) outside urban growth areas, was presented to the Senate Housing Committee on Jan. 31.
Ben Omdahl, staff to the committee, summarized the bill’s interaction with the Growth Management Act and explained its primary components: ADUs would be subject to statutory water-supply and groundwater-mitigation requirements; counties could require documentation that existing or proposed sewage or septic systems can handle added demand; no parcel may have more than one attached or detached ADU; and an attached ADU must be within 150 feet of the principal…
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