Washington Revised Code Title 70. Public Health and Safety § 70.128.140. Compliance with local codes and state and local fire safety regulations

(1) Each adult family home shall meet applicable local licensing, zoning, building, and housing codes, and state and local fire safety regulations as they pertain to a single-family residence. It is the responsibility of the home to check with local authorities to ensure all local codes are met.

(2) An adult family home must be considered a residential use of property for zoning and public and private utility rate purposes. Adult family homes are a permitted use in all areas zoned for residential or commercial purposes, including areas zoned for single-family dwellings.