The bill aims to enhance residential housing regulations in Washington State by introducing several new provisions and amending existing laws. It establishes a grant program for counties and cities to adopt preapproved accessory dwelling unit plans, ensuring that the review process for these plans is limited to administrative checks. Additionally, the bill mandates the state building code council to form work groups to simplify the production of middle housing and recommend modifications to the international building code, particularly regarding exit stairway requirements for multifamily structures. Cities are required to adopt regulations that prevent them from imposing stricter standards on middle housing compared to single-family residences, and they must also create expedited permit processes for smaller housing units.

Furthermore, the bill includes specific definitions for various housing types, such as "middle housing," "cottage housing," and "courtyard apartments," and outlines the conditions under which local governments can require administrative design reviews for housing development permits. It also stipulates that if funding for the bill is not provided by a certain date, the act will become null and void. Overall, the legislation seeks to streamline housing development processes, promote the construction of diverse housing options, and ensure compliance with safety and health standards.

Statutes affected:
Original Bill: 43.21C.229
Substitute Bill: 19.27.060
Second Substitute: 43.21C.229
Engrossed Second Substitute: 36.70B.020, 36.70B.120