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HB 1345

Establishing limitations on detached accessory dwelling units outside of urban growth areas.

2025-2026 Regular Session Introduced by Mia Gregerson and 4 co-sponsors

HB 1345 restricts detached accessory dwelling units outside Washington's urban growth areas to limit rural sprawl and infrastructure strain.

Effective date 6/11/2026.
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Bill Summary · HB 1345

Legislative bill overview

HB 1345 establishes regulatory restrictions on detached accessory dwelling units (ADUs) in Washington areas outside urban growth boundaries. The bill passed the House with overwhelming support (86-5) after floor amendments and procedural expediting in late January 2026.

Why is this important

ADUs represent a significant housing policy tool—they can increase housing supply affordably and allow property owners additional income, but uncontrolled expansion outside urban areas raises concerns about sprawl, infrastructure strain, and rural character preservation. This legislation balances housing availability against land-use planning goals by geographically targeting restrictions.

Potential points of contention

  • Rural property rights vs. land-use planning: Restricting ADUs outside growth areas may limit rural landowners' ability to develop their property or generate rental income, while supporters argue it prevents scattered development that burdens rural infrastructure
  • Housing affordability impact: Limiting ADU supply in non-urban areas could reduce affordable housing options for rural communities and workers, though proponents contend it protects agricultural and forest lands
  • Enforcement and definition clarity: Questions about how "outside urban growth areas" is defined, which jurisdictions enforce restrictions, and whether exceptions exist for specific circumstances (agricultural properties, family situations)

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

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