ADU rules in Jacksonville, FL — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Jacksonville §656.403 permits ADUs in single-family residential districts. Max size: lesser of 25% of principal structure GFA or 750 sq ft. ADUs must be in backyard, owner-occupancy required for rental. Full kitchen allowed.
Jacksonville Zoning Code §656.403 governs ADUs (Accessory Dwelling Units). ADUs are permitted as accessory uses in residential districts. Size limit: 25% of gross floor area of principal structure OR 750 square feet, whichever is less. Height: cannot exceed the primary residence. Location: must be physically separate and in the backyard. Owner-occupancy required if ADU is rented. Full kitchen with oven is allowed (updated rule). ADU rules do not apply to Beaches communities, Baldwin, or HOA/deed-restricted communities that explicitly prohibit ADUs. By December 2026, FL §163.31771 requires Jacksonville to permit ADUs in all single-family zones. Building permits required.
Unpermitted ADUs face stop-work orders and removal or legalization requirements. Fines of $500–$2,000 apply for unpermitted construction. Properties with illegal ADUs may face title issues at sale.
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See how Jacksonville's adu rules rules stack up against other locations.
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