Tiny home rules in Port St. Lucie, 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.
Port St. Lucie does not have a tiny-home-specific ordinance, and the city's minimum-dwelling-size requirements effectively prohibit traditional tiny homes (typically 100-400 sq ft) on standard residential lots. Section 158.076 (RS-3) and the corresponding RS-2 standards in Section 158.073 require a minimum 1,200 square feet of living area and 1,400 square feet of ground area for a one-story single-family dwelling. Florida Statute 163.31771 enables municipalities to permit accessory dwelling units in single-family zones, but Port St. Lucie's ADU framework remains under city review.
Port St. Lucie regulates dwelling size through Chapter 158 (Zoning Code), Article V (Residential Districts). In the RS-3 Single-Family Residential Zoning District (Section 158.076) the minimum house size is 1,200 square feet of living area and 1,400 square feet of ground area for a one-story dwelling, or 1,400 square feet of living area for a two-story dwelling. The RS-2 district (Section 158.073) imposes the same minimum dwelling-unit floor area on a 10,000-square-foot minimum lot with 60-foot minimum width. The Limited Mixed Use District (Section 158.155) sets a 1,400-square-foot minimum for single-family dwellings. Because traditional tiny homes generally fall well under these floor-area minimums, they cannot be sited as a principal dwelling on standard residential lots within the city. The city has no express tiny-home overlay, no tiny-home zone, and no separate park-model or recreational-vehicle dwelling category for residential occupancy. Recreational vehicles, park models, and travel trailers cannot be used as permanent residences on residential lots under the Zoning Code. All residential construction must comply with the 8th Edition (2023) Florida Building Code, including the 180 mph wind-load design standard applicable in Port St. Lucie. Florida Statute 163.31771 authorizes (and as recently amended encourages) municipalities to permit accessory dwelling units in single-family residential zones; Port St. Lucie has been gathering community input on ADU policy, but at present a separate ADU is not a generally permitted use in single-family districts and would require either a variance or compliance with the same minimum-dwelling-size standards if treated as a second principal dwelling. Lawful pathways for tiny-home-style living typically require either (a) an RV park or mobile-home community zoned and licensed for that use, (b) Section 158.155 LMD or another district that permits a smaller dwelling type with a Site Plan, or (c) annexation/rezoning through the city's planned-development process. St. Lucie County's unincorporated areas are governed by a separate Land Development Code with different standards.
Occupying a structure under the minimum living-area threshold as a permanent residence is a zoning violation enforced by Port St. Lucie Code Compliance through Notices of Violation and the Special Magistrate, with daily fines until removal or conversion. Living in a recreational vehicle, park model, or travel trailer on a residential lot is a separate Code violation. Unpermitted construction is enforceable under the Florida Building Code and Chapter 150 of the Port St. Lucie Code, with stop-work orders and additional permit fees. Liens may attach to the property if fines remain unpaid.
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