summary
Introduced
01/12/2026
01/12/2026
In Committee
02/20/2026
02/20/2026
Crossed Over
02/10/2026
02/10/2026
Passed
03/09/2026
03/09/2026
Dead
Signed/Enacted/Adopted
03/09/2026
03/09/2026
Introduced Session
2025-2026 Regular Session
Bill Summary
AN ACT Relating to middle housing in unincorporated areas; and 2 amending RCW 36.70A.536. 3
AI Summary
This bill amends existing law to allow counties to permit "middle housing" types, which refers to housing types like duplexes, triplexes, fourplexes, townhomes, and cottage clusters, in unincorporated areas. Specifically, it permits middle housing on parcels that currently allow single-family residences in designated "limited areas of more intensive rural development" and in "urban growth areas." The bill clarifies that if a county authorizes middle housing, it can allow up to four residential units per lot, and the development standards for middle housing should not be more restrictive than those for single-family homes, though standard development regulations like setbacks and lot coverage can still apply. Furthermore, the bill mandates that middle housing in these rural areas must be served by a publicly owned sanitary sewer system or a large on-site sewage system (a system designed to treat sewage from multiple homes), and in non-rural counties, it must be served by a publicly owned sanitary sewer system. For urban growth areas, middle housing must be served by both water and sewer services. The bill also defines "rural county" and "large on-site sewage system" for the purposes of this section.
Committee Categories
Housing and Urban Affairs
Sponsors (6)
Adam Bernbaum (D)*,
Andrew Engell (R),
Mia Gregerson (D),
Mari Leavitt (D),
Strom Peterson (D),
Julia Reed (D),
Last Action
Effective date 6/11/2026. (on 03/09/2026)
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