This bill introduces new regulations regarding the placement of mobile dwellings in residential areas within cities and counties that plan under RCW 36.70A.040. It mandates that such jurisdictions must allow up to two mobile dwellings on each residentially zoned lot, provided certain conditions are met, including the presence of an existing housing unit and compliance with utility connection requirements. The bill defines "mobile dwelling" to include various types of recreational vehicles and tiny houses on wheels. Additionally, it requires cities to incorporate these regulations into their comprehensive plans, with specific deadlines for compliance.

Furthermore, the bill prohibits associations of apartment owners, condominium associations, homeowners' associations, and common interest communities from creating any restrictions that would effectively prevent the placement of mobile dwellings as outlined in the new regulations. These provisions are set to expire on January 1, 2028. The bill also includes a clause stating that if specific funding for its implementation is not provided by June 30, 2025, the act will become null and void.