Tiny home rules in St. Johns County, FL — 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.
A tiny home on a permanent foundation must meet the full Florida Building Code as a dwelling, and St. Johns County sets no minimum house size beyond code. A tiny home on wheels is a recreational vehicle under Fla. Stat. §320.01, limited to RV parks.
Classification decides everything. A tiny house built on a permanent foundation is a dwelling and must satisfy the Florida Building Code for structure, egress, sanitation, and hurricane wind loads; the county imposes no separate minimum square footage. A tiny home built on a trailer chassis meets the Fla. Stat. §320.01 definition of a recreational-vehicle-type unit — temporary living quarters for recreational, camping, or travel use — and a wider unit is a park trailer. Either way it is titled and registered as an RV, not a house, and St. Johns County allows it as a permanent residence only within a licensed recreational vehicle park, not on a standard residential lot.
Placing a tiny home on wheels as a permanent residence on an ordinary residential lot violates zoning, since the unit is an RV limited to licensed parks. A foundation tiny home without a Building Code permit is a violation.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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