Tiny home rules in Kirkland, WA — covering tiny houses on wheels (THOWs), park model RVs, and tiny home on foundation builds — determine where they are legal and how they get permitted.
Tiny homes on foundations are allowed in Kirkland as DADUs under KZC Chapter 115 subject to IRC Appendix Q size minimums; tiny homes on wheels are treated as RVs and cannot be used as permanent dwellings.
Kirkland allows tiny homes on permanent foundations as detached accessory dwelling units (DADUs) under KZC Chapter 115, consistent with WA HB 1337. These must meet the International Residential Code including Appendix Q, which permits dwellings of 400 square feet or less with lower ceiling heights (down to 6 feet 8 inches), ladder access to lofts, and reduced emergency-escape-opening dimensions. Tiny homes must connect to city sewer and water, meet the Washington State Energy Code, and obtain a full building permit. Tiny homes on wheels (THOWs) are treated as recreational vehicles under RCW and Kirkland land use code and cannot be occupied as a permanent dwelling on a residential lot. Kirkland does not have dedicated tiny-home villages, though the county has permitted homeless shelter tiny-house villages under different rules. Zoning setbacks, lot coverage, and height limits for DADUs apply to tiny homes on foundations. Manufactured tiny homes (HUD-code) are regulated separately and allowed only in manufactured-home parks or as authorized.
Occupying a tiny home on wheels as a permanent dwelling violates zoning and is subject to stop-occupancy orders; unpermitted construction triggers building-code enforcement.
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Side-by-side rule comparisons with other cities in King County.
See how other cities in King County handle tiny homes.
See how Kirkland's tiny homes rules stack up against other locations.
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