Bill > HB1133

This bill establishes limitations on detached accessory dwelling units (ADUs) outside of urban growth areas in Washington. The key provisions include: (1) allowing counties to authorize detached ADUs outside of urban growth areas, subject to certain development regulations, such as limiting parcels to one attached or detached ADU, ensuring adequate water and sewer capacity, and restricting the size and design of the detached ADU; (2) clarifying that this new authority is cumulative to other county authority and does not affect existing ordinances authorizing ADUs or preclude other innovative techniques for authorizing ADUs in urban or rural areas. The bill also amends the definitions related to ADUs in the Growth Management Act.