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Bill

HB 1840

Authorizing middle housing in unincorporated growth areas and unincorporated urban growth areas, certain limited areas of more intensive rural development, and fully contained communities.

2025-2026 Regular Session Introduced by Mia Gregerson and 6 co-sponsors

Authorizes middle housing development in Washington unincorporated growth areas to increase residential supply and affordability while restricting development to specific geographic zones.

By resolution, reintroduced and retained in present status.
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Bill Summary · HB 1840

Legislative bill overview

HB 1840 authorizes the development of middle housing (such as duplexes, triplexes, and townhomes) in unincorporated growth areas, urban growth areas, limited rural development zones, and fully contained communities in Washington State. The bill expands where residential development can occur beyond traditional single-family zoning in unincorporated areas.

Why is this important

Middle housing development addresses housing affordability and supply constraints by allowing denser, more affordable residential options in areas currently restricted to single-family homes. This can increase housing availability while maintaining some zoning controls through geographic limitations on where such development is permitted.

Potential points of contention

  • Local control vs. state mandate: Unincorporated areas may resist state-imposed zoning changes that limit local decision-making authority over land use and development patterns
  • Infrastructure concerns: Communities worry whether roads, utilities, schools, and services can adequately support increased density without significant public investment
  • Character and density: Residents in rural or semi-rural unincorporated areas may oppose changes that fundamentally alter neighborhood character through increased housing density
  • Agricultural and environmental impacts: Restrictions on where middle housing is allowed suggest concerns about converting farmland, forests, or environmentally sensitive areas that aren't addressed in the title

Compiled from official sources — confirm details with the bill’s official record.

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