5 county-level rules, plus city-specific rules for 1 city in Duval County, Florida.
Verified from official government sources
Duval County allows accessory dwelling units in most residential zones per Ordinance Code §656. Jacksonville population (950K+) exceeds FL §163.31771 75K threshold, making ADU allowances broadly applicable.
Fla. SB 184 (2025) - Accessory Dwelling Units
requiring, rather than authorizing, local governments to adopt, by a specified date, an ordinance to allow accessory dwelling units in certain areas; authorizing a local government to provide a density bonus incentive to landowners who make certain real property donations to assist in the provision of affordable housing for military families; requiring the Office of Program Policy Analysis and ...
Sheds under 100 sq ft in Duval County generally exempt from building permit but still must meet zoning setbacks. Larger sheds require a building permit. Max one accessory structure per lot in some districts.
Garage conversions in Duval County require a building permit and must retain required off-street parking. Converted space often regulated as ADU under §656 and FL §163.31771.
Carports in Duval County require a building permit and must meet 130+ mph wind load requirements. Setbacks match zoning district requirements for accessory structures.
Tiny homes on foundations must meet Florida Building Code and zoning minimum dwelling size. Tiny homes on wheels (THOWs) regulated as RVs under FL DHSMV and not permitted as permanent dwellings in Duval residential zones.
1 cities in Duval County have their own accessory structures rules. Each link goes to that city's dedicated page with code citations.
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