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WA SB5470

WA SB5470
Establishing limitations on detached accessory dwelling units outside urban growth areas.


summary

Introduced
01/23/2025
In Committee
02/04/2026
Crossed Over
Passed
Dead
03/12/2026

Introduced Session

Potential new amendment
2025-2026 Regular Session

Bill Summary

AN ACT Relating to establishing limitations on detached accessory 2 dwelling units outside urban growth areas; amending RCW 36.70A.696; 3 and adding a new section to chapter 36.70A RCW. 4

AI Summary

This bill establishes limitations on detached accessory dwelling units (ADUs), which are separate housing units on the same property as a main home, when they are located outside of designated urban growth areas. Counties can permit these detached ADUs if they meet specific requirements, including having no more than one attached or detached ADU per parcel, adhering to water supply and sewage capacity regulations, and limiting the detached ADU's size to no more than 1,296 square feet, excluding garages and unfinished areas. The detached ADU must also share a driveway with the main home, be located within 150 feet of it, and cannot be built on forestland. If the detached ADU is used as a short-term rental, the primary home must be owner-occupied. Additionally, counties must track and report the number of detached ADUs permitted and used as short-term rentals, and update their comprehensive land use plans to account for these units within the overall density outside urban growth areas. The bill also amends existing definitions to include detached ADUs and references to this new section.

Committee Categories

Budget and Finance, Housing and Urban Affairs

Sponsors (7)

Last Action

Senate Rules "X" file. (on 02/26/2026)

Taxonomy

Community Development and Housing Issues
  • ‐ Community and Regional Development
  • ‐ Housing and Community Development for Low and Middle Income Persons
  • ‐ Rural Housing

bill text


bill summary

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bill summary

Document Type Source Location Created
State Bill Page https://app.leg.wa.gov/billsummary?BillNumber=5470&Year=2025&Initiative=false 01/22/2025
BillText https://lawfilesext.leg.wa.gov/biennium/2025-26/Pdf/Bills/Senate%20Bills/5470-S2.pdf 02/04/2026
Senate bill report https://lawfilesext.leg.wa.gov/biennium/2025-26/Pdf/Bill%20Reports/Senate/5470%20SBR%20HSG%20OC%2026.pdf 02/04/2026
Fiscal Note - 5470 SB (Revised) https://fnspublic.ofm.wa.gov/FNSPublicSearch/GetPDF?packageID=72893 02/03/2026
Fiscal Note - 5470 SB (Final) https://fnspublic.ofm.wa.gov/FNSPublicSearch/GetPDF?packageID=72519 02/03/2026
Fiscal Note - 5470 SB (Partial) https://fnspublic.ofm.wa.gov/FNSPublicSearch/GetPDF?packageID=72111 02/03/2026
Senate bill report https://lawfilesext.leg.wa.gov/biennium/2025-26/Pdf/Bill%20Reports/Senate/5470%20SBR%20HSG%20TA%2026.pdf 01/29/2026
Senate bill report https://lawfilesext.leg.wa.gov/biennium/2025-26/Pdf/Bill%20Reports/Senate/5470%20SBA%20HSG%2026.pdf 01/20/2026
Goehner 5470-S AMS GOEH S2297.1 https://lawfilesext.leg.wa.gov/biennium/2025-26/Pdf/Amendments/Senate/5470-S%20AMS%20GOEH%20S2297.1.pdf 03/12/2025
Senate Bill Report https://lawfilesext.leg.wa.gov/biennium/2025-26/Pdf/Bill%20Reports/Senate/5470%20SBR%20WM%20OC%2025.pdf 02/21/2025
BillText https://lawfilesext.leg.wa.gov/biennium/2025-26/Pdf/Bills/Senate%20Bills/5470-S.pdf 02/13/2025
Senate Bill Report https://lawfilesext.leg.wa.gov/biennium/2025-26/Pdf/Bill%20Reports/Senate/5470%20SBR%20HSG%20OC%2025.pdf 02/12/2025
Senate Bill Report https://lawfilesext.leg.wa.gov/biennium/2025-26/Pdf/Bill%20Reports/Senate/5470%20SBR%20HSG%20TA%2025.pdf 02/06/2025
Senate Bill Report (Orig.) https://lawfilesext.leg.wa.gov/biennium/2025-26/Pdf/Bill%20Reports/Senate/5470%20SBA%20HSG%2025.pdf 01/30/2025
BillText https://lawfilesext.leg.wa.gov/biennium/2025-26/Pdf/Bills/Senate%20Bills/5470.pdf 01/22/2025
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