WA · 2023

HB 1110 Middle Housing

Requires most Washington cities to allow middle housing — duplexes up to sixplexes, townhouses, cottage housing, and stacked flats — on lots zoned single-family, with density tiers based on city size. Central Puget Sound cities had to comply by June 30, 2025; other cities phase in through 2027.

Guides for HB 1110 Middle Housing are on the way.