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Council continues ADU regulation update under HB 13‑37, directs staff to return with lot‑size and parking options
Summary
City staff presented proposed amendments to Des Moines’ ADU rules to meet HB 13‑37; the council instructed staff to prepare code options tying increased ADU size and additional units to lot size and to return with two parking‑flexibility options but did not adopt final regulations April 10.
City staff returned April 10 to continue the council’s review of proposed updates to local accessory dwelling unit regulations required by Washington state’s House Bill 13‑37.
Community Development Director Rebecca Denning told the council that “HB 13‑37 requires all local governments in Washington state planning under the Growth Management Act to update their ADU regulations to comply with HB 13‑37 by 06/30/2025.” Staff proposed changes that meet the bill’s minimum requirements and offered options on three main topics: the number/configuration of ADUs allowed per lot, ADU size limits, and parking requirements.
Key elements of staff proposals and council direction: - Number/configuration: Staff said the minimum state requirement is to allow up to two ADUs per lot; staff offered options to allow more on larger lots.…
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