ADU rules in St. Lucie County, FL — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
The St. Lucie County Land Development Code has no separate ADU or guest-house use; a second living unit is treated as an accessory structure and is capped in size. Florida law (F.S. 163.31771) lets counties choose to allow ADUs in single-family zones.
St. Lucie County's Land Development Code (LDC) does not define an accessory dwelling unit or guest house as a distinct use for unincorporated land. A detached structure is regulated under Chapter VIII as an accessory structure, and per LDC 8.00.02(B) no accessory structure in a residential zoning district may occupy more than thirty-five percent of the lot's maximum permitted building area. Whether a fully independent second dwelling is allowed depends on the underlying zoning district. Florida Statute 163.31771 separately authorizes any local government to adopt an ordinance permitting ADUs in single-family zones, often tied to affordable-rent affidavits. Confirm current rules with St. Lucie County Planning; incorporated Port St. Lucie and Fort Pierce set their own ADU codes.
Building or renting an unpermitted second dwelling is a Land Development Code violation enforced by St. Lucie County Code Compliance under Chapter XI, with notices, daily fines, and Special Magistrate liens until corrected.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how St. Lucie County's adu rules rules stack up against other locations.
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