Tiny home rules in Fontana, CA — 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.
Stationary tiny homes in Fontana permit as ADUs under Gov Code 65852.2 up to 1,200 sq ft. Tiny houses on wheels are treated as RVs and cannot be permanent residences outside an RV park.
Tiny-home legality in Fontana depends entirely on construction type and foundation. Stationary tiny homes - built on a permanent foundation and constructed to California Residential Code standards - fit naturally into the ADU framework. Under Government Code 65852.2, a tiny home on foundation can be permitted as an attached or detached ADU up to 1,200 square feet with a ministerial 60-day approval, minimal setbacks, no extra parking in transit-rich areas, and no owner-occupancy requirement. Fontana Building and Safety requires standard plan check, structural engineering, Title 24 energy compliance, fire sprinklers if the primary dwelling has them, and full utility connections. Tiny Homes Built to HUD Code (manufactured housing) are also allowed as ADUs with proper foundation tie-down and skirting. Movable Tiny Houses on Wheels (THOWs) are different. A THOW registered as a Park Model RV or travel trailer through the California Department of Motor Vehicles is classified as an RV, and Fontana Municipal Code generally prohibits living in an RV on private residential property except during active construction of a permitted home, a brief guest stay, or within a licensed RV park. Using a THOW as a full-time residence in a backyard without a permit violates zoning and can trigger Code Enforcement action. Some California cities have adopted THOW-specific ADU ordinances, but Fontana has not yet, so residents seeking a legal tiny-home ADU should plan on a permanent-foundation structure.
Contact your local code enforcement office for specific penalty information.
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Side-by-side rule comparisons with other cities in San Bernardino County.
See how other cities in San Bernardino County handle tiny homes.
See how Fontana's tiny homes rules stack up against other locations.
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