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SB 5413

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

2025-2026 Regular Session Introduced by Liz Lovelett and 2 co-sponsors

SB 5413 restricts detached accessory dwelling units in Washington's rural areas outside urban growth boundaries, limiting housing density expansion outside designated urban zones.

First reading, referred to Housing.
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Bill Summary · SB 5413

Legislative bill overview

SB 5413 would establish restrictions on detached accessory dwelling units (ADUs)—small residential structures on single-family properties—in areas outside urban growth boundaries in Washington State. The bill limits where these units can be constructed in rural and unincorporated areas, creating geographic distinctions in ADU development permissions.

Why is this important

Housing affordability and density are significant policy challenges in Washington, and ADUs are often promoted as a way to increase housing supply affordably. This bill addresses concerns about sprawl and environmental impacts in rural areas while potentially affecting property owners' development options and renters seeking affordable housing in less urban communities.

Potential points of contention

  • Rural development rights vs. sprawl prevention: Property owners outside urban areas may view restrictions as limiting their development opportunities, while proponents argue it prevents unsustainable rural sprawl
  • Housing supply trade-offs: Limiting ADUs in rural areas may reduce affordable housing options for rural communities while potentially concentrating housing pressure in already-dense urban areas
  • Implementation and equity: Determining where "urban growth areas" end and enforcing differential rules across jurisdictions may create complexity and raise questions about fairness between rural and urban property owners

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

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