The bill amends Washington state law to redefine and enhance the requirements for middle housing and transit stops. It introduces a new definition for "major transit stop," which now includes stops on bus rapid transit routes, particularly those under construction. The definition of "middle housing" is broadened to include various residential building types compatible with single-family homes, such as duplexes, triplexes, and courtyard apartments, with the latter no longer limited to four attached units. The bill also emphasizes the need for active transportation facilities that support walking, biking, and mobility assistive devices, ensuring compliance with the Americans with Disabilities Act.

Additionally, the legislation sets new housing density requirements based on city population sizes, mandating that cities with populations between 25,000 and 75,000 develop at least two units per lot, while those over 75,000 must allow at least four units per lot, with specific provisions for areas near major transit stops and affordable housing. Cities under 25,000 in larger urban growth areas must also adhere to these standards. The bill includes exemptions and conditions regarding critical areas and parking, allows for alternative density requirements, and clarifies that building permits are contingent on meeting other regulations. It also ensures that new residential capacity aligns with existing countywide planning policies and environmental considerations.

Statutes affected:
Original Bill: 36.70A.635, 36.70A.620, 36.70A.696
Substitute Bill: 36.70A.635
Engrossed Substitute: 36.70A.635
Bill as Passed Legislature: 36.70A.635
Session Law: 36.70A.635