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Bill

HB 1353

Establishing a self-certification program for accessory dwelling unit project permit applications.

2025-2026 Regular Session Introduced by Beth Doglio and 4 co-sponsors

Washington streamlines ADU approvals by allowing property owner self-certification instead of municipal permit review, accelerating housing development while reducing local oversight authority.

Effective date 7/27/2025.
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Bill Summary · HB 1353

Legislative bill overview

HB 1353 establishes a self-certification program allowing property owners to certify compliance with accessory dwelling unit (ADU) standards rather than requiring full municipal permit reviews. The bill streamlines the approval process for ADUs—secondary residential units on single-family properties—by reducing bureaucratic barriers and approval timelines.

Why is this important

This legislation addresses housing affordability and supply by making it faster and cheaper to add rental units to existing residential properties. By reducing permitting costs and timelines, the bill incentivizes homeowners to develop ADUs, potentially increasing the housing stock in Washington without requiring new construction on vacant land.

Potential points of contention

  • Local control concerns: Cities and counties lose some oversight authority, which may worry municipalities concerned about neighborhood character, infrastructure capacity, or enforcement of building standards
  • Safety and code compliance: Self-certification relies on property owner honesty rather than professional inspection, potentially creating gaps in electrical, plumbing, fire safety, or structural code adherence
  • Equity questions: Benefits may disproportionately flow to homeowners with capital to invest in ADU construction, while renters in tight markets may see limited affordability gains if owners charge market-rate rents

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

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