The bill establishes regulations for detached accessory dwelling units (ADUs) outside urban growth areas in Washington State. It allows counties to permit these units under specific conditions, including limitations on the number of units per parcel, compliance with water supply and sewage system requirements, and restrictions on the size of the units, which cannot exceed 1,296 square feet. Additionally, the bill mandates that the detached ADUs must share a driveway with the principal unit and be located within a certain distance from it. Other stipulations include metering water withdrawals, ensuring the primary unit is owner-occupied if the ADU is used as a short-term rental, and prohibiting construction in designated forestland.

Counties are also required to track and report the number of ADU permits issued and those utilized as short-term rentals, updating their comprehensive land use plans accordingly. The bill amends existing definitions related to accessory dwelling units and clarifies that these new regulations do not affect previously adopted county ordinances or exclude other methods of authorizing ADUs. The legislation aims to provide a structured approach to the development of ADUs while ensuring that local resources and infrastructure are adequately managed.

Statutes affected:
Original Bill: 36.70A.696
Substitute Bill: 36.70A.696