StateWashington

HB 1345: Establishing limitations on detached accessory dwelling units outside of urban growth areas.

Sam LowIntroduced

HB 1345 status: Introduced — Effective date 6/11/2026 (updated Mar 27, 2026).

1

What this bill does

Overall score

Score50/100 civic fit
RiskHigh risk
ImpactModerate impact 65/100

Bill summary

Official

A bill currently being debated in the House would set stricter rules for building detached "backyard cottages" or guest houses in rural areas outside of city limits.

Key analysis

Constitutionality80%
Bipartisan75%
Public opinion50%
2

Impact analysis

Environment

Positive Outlook
60%

Benefits

  • Limits rural sprawl
  • Protects natural resource lands

Risks

  • Reduces efficient land use for housing
  • Limits density in unincorporated areas

Economy

Critical Outlook
40%

Benefits

  • Prevents infrastructure strain in rural zones
  • Preserves property predictability

Risks

  • Increases regulatory hurdles for construction
  • Restricts local housing supply expansion

Society

Mixed / Neutral
50%

Benefits

  • Maintains existing rural community character

Risks

  • Reduces flexibility for multigenerational housing
  • Constrains housing options in rural settings
3

How trustworthy & consequential it is

Source

OpenStates

Confidence

low

low

Analysis status

OpenStates summary

Warning

LegiScan returned a PDF-only document. PDF extraction is not enabled in this build, so the pipeline used a safer fallback.

Limitation

Analysis restricted to summary abstract provided.

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Where it stands

1

Introduced

Current

Effective date 6/11/2026.

2

Committee

Upcoming
3

Floor

Upcoming
4

Governor

Upcoming
5

Enacted

Upcoming
5

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6

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