The bill aims to address the growing issue of housing affordability by establishing a new category of building codes specifically for "kit homes." These homes are defined as residential structures that are 800 square feet or smaller, made from prefabricated walls, floors, and roofs that are assembled on-site. The legislation recognizes the need for affordable housing options for homebuyers of modest means and seeks to create a regulatory framework that facilitates the construction of these smaller, more affordable homes.

To implement this initiative, the bill reenacts and amends existing legal definitions in RCW 19.27.015, including the introduction of the term "kit homes." Additionally, it mandates that the state building code council develop and update the building codes applicable to kit homes by December 31, 2025. This effort is intended to streamline the approval process for constructing kit homes, thereby making them a viable option for those seeking affordable housing solutions in Washington State.