The bill amends RCW 35A.63.100 and adds new sections to chapters 35.63 and 36.70 RCW to authorize cities and counties to site and permit "kit homes" for emergency housing. Kit homes are defined as factory-constructed structures consisting of prefabricated walls, floors, and roofs assembled on-site that are 800 square feet or smaller. Municipalities may allow kit homes in zones or areas that allow single-family or other residential uses and in certain limited development spaces; counties may permit kit homes in residential zones and in areas not zoned for permanent housing where emergency housing is needed. The text retains that zoning ordinance changes require at least one public hearing with notice as provided in RCW 35A.63.070 and that municipalities may adopt or eliminate minimum gross floor area requirements for single-family detached dwellings (with reference to the state building code). The bill creates new statutory authority and procedural provisions rather than establishing new criminal penalties. It requires cities and counties to adopt an inspection process by ordinance or other action so kit homes meet sufficient life, health, and safety standards, with inspections at least once every five years. Kit homes may be permitted for a limited time (duration not specified in the provided text). Important details are not included in the extracted facts: the meaning of "limited time" and "limited development space" is unspecified, the specific life/health/safety standards and enforcing authority are not defined here, the ordinance adoption process and enforcement mechanics are not described, and the interaction with other zoning, building, or health codes beyond a general reference to the state building code is unclear.

If enacted, the bill lets cities and counties approve small factory-built "kit homes" (800 sq. ft. or smaller) as short-term emergency housing in places that already allow single-family homes and in other limited or nonpermanent areas, and requires local governments to inspect those units at least once every five years and hold at least one public hearing for any zoning action. Practically, this gives local governments a quicker, lower-barrier housing option to place temporary units where emergency shelter is needed and allows them to remove minimum floor-area rules that might otherwise block small units. The groups most affected are city and county legislative bodies, planning departments, and boards that will now have authority and new duties: they must adopt ordinances, run hearings, set up recurring inspection programs, and absorb the ongoing administrative and inspection costs and potential enforcement or liability risks. Key implementation details are missing here—how long "limited time" permits last, the exact life/health/safety standards to use, and how these rules interact with the state building code—so those uncertainties will affect costs, timing, and legal risk.