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Council hears details of House Bill 1110 implementation: middle housing types, density, setbacks and parking
Summary
Central staff briefed the select committee on draft implementing regulations for the state’s middle-housing law (House Bill 1110), covering definitions of housing types, density measures, ADU counting, lot splitting, alley setbacks, sidewalk thresholds, tree and amenity-area rules, and parking exemptions; no formal council votes were taken.
Central staff briefed the Seattle City Council Select Committee on June 13 about council bill 120993, the implementing legislation for Washington State House Bill 1110 and related neighborhood residential zone updates.
"House Bill 11 10 requires the city to permit at least 6 of 9 middle housing types in all zones that allow single family homes," said Lish Whitson, central staff, summarizing the state requirement and how the phase 1 bill proposes to comply. Staff described the bill’s three broad building-type categories: detached dwelling units (single-family and cottages), stacked dwelling units ("stack flats" and similar forms), and attached dwelling units (townhouses, duplexes, triplexes).
Staff explained how density and building size would be measured under the draft code. The bill uses two measures: units per lot and floor-area ratio. Whitson said stacked flats would be eligible for higher floor-area ratio and unit counts when on lots 6,000 square feet or larger and within frequent transit service areas; the draft also counts…
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