WA SB5332

Cities and counties planning under the Growth Management Act must allow at least one mobile dwelling unit (travel trailers, fifth-wheel trailers, tiny houses on wheels, motor homes) on residential lots within urban growth areas that have an existing housing unit and adequate sewer service

Mobile dwelling units must connect to electrical service via a minimum 20-amp GFCI-protected dedicated circuit, and if equipped with internal plumbing, must connect to potable water and sewer from the existing home on the lot

Units without internal plumbing require occupants to have 24/7 access to water, toilets, and showers in the existing housing unit on the lot

Homeowners associations, condominium associations, and common interest communities cannot create restrictions that prohibit mobile dwelling units where required by this act; these HOA provisions expire January 1, 2028

Mobile dwelling units must meet zone setback requirements, be maintained so they can be moved at any time, and cannot be located in shorelines or critical areas