The bill creates a new state program for "permit-ready plans" for factory built housing, adds new sections to chapter 43.22 RCW and chapter 36.70A RCW, and amends RCW 43.22.460. It requires the responsible department to solicit, review, and publish approved permit-ready plans (covering single-family detached homes, detached accessory dwelling units, and attached units from duplexes through eightplexes), maintain a public website, and use memoranda of agreement (MOAs) with plan creators addressing use, ownership/copyright, releases, licensing, confidentiality, liability, indemnification, and insurance. Permit-ready plans must have design plan approval under cited RCWs, indicate applicable climate zones and wildfire ratings, meet code-cycle-specific approval, and expire at the start of a new state building code cycle. The bill creates a procedural change and a limited preemption: factory built housing constructed under an approved permit-ready plan is exempt from local architectural and aesthetic design standards (such as façades, rooflines, materials, fenestration, and other appearance rules) unless those standards are part of a wildfire urban interface code, expressly related to health and safety, or located in a locally designated historic district. Beginning January 1, 2027 (though see effective date conflict noted below), counties and cities planning under chapter 36.70A may not deny land use applications solely for noncompliance with those local aesthetic standards. Local governments may verify state approval and site compliance, charge plan review fees based on actual staff time and reasonable resource estimates that do not exceed standard comparable fees, and must adopt model ordinances the department publishes or substantially similar ordinances with written department approval. The bill also sets maximum licensing fee limits to be updated each state building code cycle, requires local review periods prior to publication (minimums of 30 days and 60 days are both referenced), limits civil liability for the state, its officers/employees, and plan creators except for bad faith or willful misconduct, and directs coordination with relevant agencies. Important details are unclear from the extracted facts: the specific identity of the "department" referenced in some sections is not stated, the relationship between the two different local review periods is not explained, there is an apparent conflict between a January 1, 2027 start date for some requirements and an overall effective date of July 1, 2028 for sections 2–4, and the exact contents of the referenced RCWs, the method for calculating maximum licensing fees, and the full MOA terms are not provided here.

If enacted, the law would give factory-built housing manufacturers and builders access to state-approved, licenseable "permit-ready" plans for single-family homes, ADUs, and units from duplexes up to eightplexes, and those projects could not be denied locally just because they fail local architectural or aesthetic rules (except in historic districts or where rules are tied to health, safety, or wildfire urban interface codes). That will likely speed approvals, reduce the risk and cost of losing projects over design details, and create a predictable licensing fee ceiling for plan authors, while local governments would still be able to check zoning/site compliance and charge plan review fees limited to actual staff time and comparable rates. The state agency named in some sections (and the Department of Labor and Industries in others) would have new duties to solicit, approve, host, and license plans, sign memoranda of agreement with plan creators, publish model ordinances for local adoption, and update fee caps each building code cycle, which will require staff time and resources; local building departments must review proposed plans before publication and adopt the model or similar ordinances. Key uncertainties that affect how quickly and at what cost these changes take effect include which specific state department will run the program, a date conflict between provisions that reference January 1, 2027 and an effective date of July 1, 2028, inconsistent 30versus 60-day local review periods, and missing details about the MOA terms and how maximum licensing fees are set.