ADU rules in Port St. Lucie, FL — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Port St. Lucie permits accessory dwelling units in select zoning districts subject to owner occupancy, size limits typically capped at 50% of the primary dwelling, and Florida Building Code hurricane construction. No statewide ADU mandate exists.
Florida does not have a statewide ADU mandate like California, so ADU authority is purely a matter of local zoning. Port St. Lucie allows accessory dwelling units, sometimes called guest cottages or granny flats, in single-family zoning districts subject to conditional-use review in most cases. Standards typically include a size cap of 50 percent of the primary dwelling floor area (often 750 to 900 sq ft), owner occupancy of either the primary or accessory unit, one additional off-street parking space, separate utility metering or submetering, and compliance with the Florida Building Code 7th Edition wind-load requirements for St. Lucie County (150 mph Ultimate Design Wind Speed). ADUs must connect to city water and sewer. Impact fees apply at a reduced rate compared to new single-family construction. Short-term rental of ADUs is allowed only where the property is already eligible to operate an STR, as further regulated by FL §509.032 state preemption. The Live Local Act (SB 102, 2023) may expand affordable housing opportunities but has not yet mandated ADU approvals statewide.
Unpermitted ADU construction: stop-work order, fines up to $500 per day, and order to remove or bring into compliance. Renting out a non-conforming ADU: code enforcement and potential utility disconnection.
Port St. Lucie, FL
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See how Port St. Lucie's adu rules rules stack up against other locations.
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