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City staff outline required middle‑housing code changes, unit‑lot subdivisions and ADU allowances
Summary
Planning staff presented state‑mandated middle‑housing code amendments including a two‑unit‑per‑lot minimum, unit‑lot subdivision procedures, administrative design review for middle housing, ADU size increase to 1,000 sq ft and allowance for up to two ADUs per lot; council will consider adoption in May or June.
The Mill Creek City Council received a study session briefing on April 1 about state laws requiring local code changes to allow middle housing — housing types compatible with single‑family neighborhoods such as duplexes, triplexes, fourplexes, cottage courts and townhouses.
The briefing matters because state legislation (commonly cited as HB 1110 and related middle‑housing bills) requires cities to allow certain middle‑housing types in areas zoned for single‑family housing and to update permitting standards and parking rules; Mill Creek staff presented a minimum‑compliance package and options for additional design standards later.
Director Jeff Ryan (Community Development) and planner Justin Horn told council the proposed amendments are targeted at minimum statutory compliance. Key…
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