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Des Moines council adopts ADU ordinance to comply with state law, removes owner-occupancy and limits fees
Summary
The city adopted Ordinance 25-056 to align accessory dwelling unit (ADU) rules with 2023 state law (HB 1337): no owner-occupancy requirement, a 3-ADU-per-lot limit, a size cap of 1,200 sq ft, and reduced impact-fee treatment.
The Des Moines City Council voted unanimously at its June 12 meeting to adopt Ordinance 25-056, amending municipal code to conform to Washington’s 2023 accessory dwelling unit law (House Bill 1337) and implementing local standards.
Under the ordinance the city will not require owner occupancy for properties with ADUs (removing an earlier local requirement). The code permits up to three ADUs on a lot in any configuration (attached or detached) and establishes ADU size between 350 square feet and 1,200 square feet. The ordinance also aligns impact-fee policy with state rules so cities…
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