Prohibits restrictions on the location of mobile homes or manufactured homes based exclusively on age and dimensions.

Provides that a city or town, code city or county may not adopt an ordinance that has the effect, directly or indirectly, of restricting the location of mobile homes or manufactured homes in mobile home parks or manufactured housing communities, as defined in RCW 59.20.030, which were legally in existence before the effective date of this section, based exclusively on the age or dimensions of the mobile home or manufactured home. This does not preclude a city or town from restricting the location of a mobile home or manufactured home in mobile home parks or manufactured housing communities for any other reason including, but not limited to, failure to comply with fire, safety, or other local ordinances or state laws related to mobile homes and manufactured homes.