The bill establishes regulations for detached accessory dwelling units (ADUs) outside of urban growth areas in Washington State. It allows counties that choose to plan under the relevant chapter to permit these units, provided they adhere to specific limitations. Key requirements include that no parcel may have more than one ADU, the unit must comply with water supply and sewage system regulations, and its gross floor area cannot exceed 1,296 square feet. Additionally, the bill mandates that counties implement code enforcement measures for unpermitted ADUs, including penalties and a voluntary compliance process, and requires tracking and reporting of ADU permits to ensure compliance with comprehensive land use plans.

The bill also amends existing definitions related to accessory dwelling units and clarifies that the new regulations do not affect previously adopted county ordinances regarding ADUs. It specifies that counties must limit the allocation of rural population targets to a certain percentage for detached ADUs, ensuring that development does not exceed underlying densities. Overall, the legislation aims to facilitate the development of ADUs while maintaining regulatory oversight and protecting community resources.

Statutes affected:
Original Bill: 36.70A.696
Engrossed bill: 36.70A.696
Bill as passed Legislature: 36.70A.696
Session law: 36.70A.696