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Washington · 2025–26 Regular Sessions · Bill

HB 1345: Detached ADU limits

Enacted Official data

  1. Introduced
  2. In committee
  3. Passed one chamber
  4. Passed both chambers
  5. Enacted

Last official action: ·Record last updated:

Plain-language summary

HB 1345 is a bill introduced in the Washington House on January 16, 2025. According to its official title, it concerns: Establishing limitations on detached accessory dwelling units outside of urban growth areas. Primary sponsor: Sam Low (R), Sam Low (R). It lists 8 additional sponsors. Most recent recorded action (March 27, 2026): Governor signed.

Generated automatically from the official title, sponsor list, and status record only. It does not characterize the bill’s purpose or effects. How summaries are written

Official title

AN ACT Relating to establishing limitations on detached accessory dwelling units outside of urban growth areas;

Nonpartisan staff bill reports (analyses) are available on the official bill page.

Sponsors

Sponsors by party (alphabetical): Democratic 8 · Republican 2

NameRolePartyChamberDistrict
Sam LowPrimary sponsorRepublicanHouse39
Sam LowPrimary sponsorRepublicanHouse39
Mia GregersonCo-sponsorDemocraticHouse33
Mia GregersonCo-sponsorDemocraticHouse33
Greg NanceCo-sponsorDemocraticHouse23
Greg NanceCo-sponsorDemocraticHouse23
Strom PetersonCo-sponsorDemocraticHouse21
Strom PetersonCo-sponsorDemocraticHouse21
Steve TharingerCo-sponsorDemocraticHouse24
Steve TharingerCo-sponsorDemocraticHouse24

“Support” is shown only as formal sponsorship recorded by the legislature. Roll-call votes are available on the official bill page.

Recent official actions

  1. Governor signed.
  2. Chapter 231, 2026 Laws.
  3. Effective date 6/11/2026.
  4. Delivered to Governor.
  5. Speaker signed.
  6. President signed.
  7. Rules suspended. Placed on Third Reading.
  8. Third reading, passed; yeas, 33; nays, 15; absent, 0; excused, 1.
  9. Placed on second reading by Rules Committee.
  10. Passed to Rules Committee for second reading.
  11. HSG - Majority; do pass.
  12. First reading, referred to Housing.

Showing 12 most recent of 23 actions. Full history

Sources

  1. Washington State Legislature Web Services
  2. Official bill page