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SB 5470

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

2025-2026 Regular Session Introduced by Jess Bateman and 6 co-sponsors

SB 5470 restricts detached accessory dwelling unit construction outside Washington's urban growth areas to control rural development and land use patterns.

Senate Rules "X" file.
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WeVote Research Nonpartisan
Bill Summary · SB 5470

Legislative bill overview

SB 5470 establishes regulatory limitations on detached accessory dwelling units (ADUs) that are built outside urban growth areas in Washington State. The bill restricts where and how these secondary residential structures can be constructed on rural and non-urban properties, potentially affecting housing development patterns across the state.

Why is this important

ADUs are increasingly relied upon to address housing shortages and affordability, particularly in rural communities. This bill directly impacts housing supply options for rural residents and property owners seeking to develop their land, while also reflecting broader state policy debates about growth management and land use control outside designated urban centers.

Potential points of contention

  • Rural housing access vs. growth management: Limiting ADUs outside urban areas may reduce affordable housing options in rural communities while proponents argue it protects agricultural land and prevents sprawl
  • Property rights and development flexibility: Restrictions may frustrate landowners wanting to develop their property or generate rental income through ADUs, versus supporters concerned about uncontrolled rural development patterns
  • Enforcement and definition clarity: The bill's specific limitations and how "outside urban growth areas" is defined could create ambiguity for local jurisdictions implementing the rules and property owners seeking compliance

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

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