ADU rules in St. Petersburg, FL — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
St. Petersburg permits accessory dwelling units in many residential districts under Land Development Regulations Sec. 16.50.010, with size, lot, parking, and design rules expanded by Ordinance 509-H.
Sec. 16.50.010 of Chapter 16 Land Development Regulations governs accessory dwelling units in St. Petersburg. ADUs are allowed in NS, NT, and NSM neighborhood districts following Ordinance 509-H adopted in 2022 and supported by Florida Statute 163.31771. Lots in NT districts must be at least 4,500 square feet, and the primary residence must contain at least 60 percent of the combined living area while the ADU is capped at 40 percent. ADUs may be attached, detached, or above a garage and require their own kitchen, bathroom, and entrance. Separate mailing addresses are prohibited and short-term rental of ADUs is restricted by city vacation rental rules. Owners must obtain zoning and building permits, meet setbacks, parking, and height standards, and comply with the Florida Building Code.
Building or renting an ADU without permits, exceeding the 40 percent floor area cap, or assigning a separate mailing address can trigger code enforcement action, daily fines, stop-work orders, and required removal or modification.
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Side-by-side rule comparisons with other cities in Pinellas County.
See how other cities in Pinellas County handle adu rules.
See how St. Petersburg's adu rules rules stack up against other locations.
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