Tiny home rules in Clark County, 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.
Washington defines a tiny house as a dwelling that may be built on wheels and is no larger than 400 sq ft, excluding lofts. To be a legal permanent residence in Clark County a tiny home generally must sit on a foundation and comply with the Washington State Building Code
Clark County follows the Washington State Building Code, administered by the Department of Labor and Industries. A tiny house on a permanent foundation is regulated as a dwelling and, on a residential lot, typically qualifies as a single-family home or an ADU under CCC 40.260.020/40.260.022, subject to the same size, setback, sewer and water rules. Tiny homes on wheels are classified similarly to recreational vehicles, meaning short-term occupancy only and no long-term rental. Rural hardship placements of a temporary mobile/modular unit may be allowed under CCC 40.260.210 if a qualifying standard is met.
Occupying a tiny home on wheels as a permanent residence, or placing a foundation tiny home without permits, violates zoning and building codes and can prompt correction orders and removal.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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Clark County encourages backyard composting and runs free workshops, We Compost community food-waste hubs, and a Composter Recycler program. Optional every-o...
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Clark County has no ordinance banning residential artificial turf, and homeowners may install it in their yards. In development-regulated landscaping, county...
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Washington's RCW 17.10 requires every property owner to eradicate Class A noxious weeds and control designated Class B and listed Class C weeds. The Clark Co...
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