The bill aims to enhance housing options in Washington State by permitting the administrative splitting of existing residential lots to create new residential lots. It requires cities to establish regulations to facilitate this process, which can be integrated with the review of residential building permits. The legislation specifies conditions for lot splits, including minimum lot sizes, adherence to development standards, and the necessity for certificates of availability from sewer and water providers. Importantly, it prohibits cities from imposing limits on the total number of dwelling units on the parent or newly created lots that fall below what is allowed by the underlying zoning prior to the split.

Additionally, the bill amends existing laws to mandate that cities with certain population thresholds increase residential density, including the development of at least six types of middle housing. It outlines conditions for affordable housing commitments and includes provisions for administrative design review and reduced off-street parking requirements for middle housing near major transit stops. The bill also provides immunity to cities from liability related to lot split approvals and establishes a timeline for compliance with the new regulations. A new section has been added stating that if specific funding for the act is not provided by June 30, 2025, it will become null and void, underscoring the necessity of securing funding for the proposed changes.

Statutes affected:
Engrossed Second Substitute: 36.70A.635
Bill as Passed Legislature: 36.70A.635
Session Law: 36.70A.635