Tiny home rules in Hawaii County, HI — 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.
Hawai'i County has no separate 'tiny home' category. A tiny house on a permanent foundation is a dwelling under HCC Chapter 25 (subject to zoning, permits and, if it is a second unit, ohana rules); a tiny house on wheels is generally treated as a vehicle, not a permitted dwelling.
The County of Hawai'i regulates all housing through HCC Chapter 25 and the adopted building code. A permanently sited tiny home must meet the same building-permit, setback, height and parking requirements as any dwelling, and counts against the number of dwellings allowed on the lot. As a second unit it must qualify as an ohana dwelling under Sections 25-6-30 through 25-6-38 (legal lot of record; 10,000 sq ft combined; adequate water, sewage, fire and access). A tiny house on wheels (THOW) is typically classified as a recreational vehicle/trailer and is not an approved permanent residence. Confirm the pathway with the Planning Department before building.
Living in an unpermitted tiny structure or parking a THOW as a residence can be a zoning/building violation, triggering correction orders and fines.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how Hawaii County's tiny homes rules stack up against other locations.
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