Sedro-Woolley adopts ADU code change to comply with state law allowing two accessory units per lot

Sedro-Woolley — The City Council adopted Ordinance 208325 on Dec. 17, amending the municipal code to allow up to two accessory dwelling units (ADUs) per lot in residential zones, including the R-15 zone, in order to comply with state House Bill 1337.

City planner Mr. Glover told the council this is the third presentation of the ordinance; the change is required under HB 1337 for cities planning under the Growth Management Act. "Approving the amendments as shown in this attached ordinance will bring the city into compliance with the requirements of 1337," Glover said.

Council members asked about related elements of the comprehensive plan — including policies that could allow manufactured homes — and about whether RVs or travel trailers used as housing are covered by this ordinance. Glover said those are separate issues: RVs outside parks are subject to building-code restrictions and code enforcement, while the ADU ordinance governs dwellings such as single‑wide manufactured homes and permanent accessory units.

Councilman Henderson, who said developers have been awaiting clarity, moved to adopt the ordinance and Councilwoman Diamond seconded. The council approved the ordinance by voice vote. Staff said codification and publication steps will follow before permits may be submitted.

If codified as adopted, the change allows property owners to seek permits for ADUs consistent with state requirements; staff estimated the ordinance will be published after codification and then available for permit applications.