ADUs

Accessory dwelling units (ADUs) just got a bit easier to build in Seattle, as legislation passed in May went into effect yesterday. The reform will help Seattle meet state mandates to make ADUs easier to built. Ultimately, wider middle housing reforms planned in the coming months may prove more attractive to builders.

The Snohomish County Council has further liberalized accessory dwelling unit (ADU) regulations in urban unincorporated areas, building on reforms enacted in 2021. Spurred by state reforms, the County will be allowing more bulk flexibility and ending common ownership requirements for ADUs, and allowing two ADUs of any type per lot.

Mayor Harrell unveiled legislation allowing larger ADUs and streamlining regulations to make them feasible on more lots. The proposal would implement a state requirement and offer some additional reforms beyond that baseline.

Accessory dwelling units like backyard cottages and basement apartments support sustainable development plans as they typically require fewer resources during construction, are energy-efficient, and minimize urban sprawl. They are one effective way to add density to single family areas.

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