ADU rules in Duval County, FL — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
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.
Consolidated Jacksonville-Duval (population ~950,000) is subject to FL §163.31771 (2024) requiring ADUs to be allowed on any lot that permits single-family residential use. Local zoning in Chapter 656 permits ADUs subject to: maximum size typically 800 sq ft or 50% of primary dwelling (lesser); one off-street parking space; owner must occupy primary or ADU; ADU must meet setback and lot coverage of its zone. Building permit, septic/sewer approval, and impact fees apply. ADUs may be detached, attached, or internal (basement/garage conversion).
Unpermitted ADU: code enforcement action, occupancy prohibited until permitted; fines up to $500/day.
Duval County, FL
Persistent dog barking is an animal-nuisance violation under Jacksonville Ordinance Code Chapter 462 (Animals). Barking continuously for more than 10-15 minu...
Duval County, FL
Jacksonville enforces decibel limits under Chapter 368: residential zones are limited to 70 dBA daytime and 60 dBA nighttime, measured at the receiving prope...
Duval County, FL
Construction noise is generally restricted to 7 AM - 7 PM Monday through Saturday countywide under Jacksonville Ordinance Code Chapter 368. Sunday and holida...
Duval County, FL
Commercial vehicles over 1 ton or with lettering may not be parked overnight in Duval residential zones per §656.404(d) Jax-Duval Code. Tractor-trailers, bus...
Duval County, FL
Barbed wire, razor wire, and electrified fences are restricted in Duval residential zones under §656.407(g). Hurricane zones require fence materials and fast...
Duval County, FL
Fences over 6 ft tall, fences in the sight triangle, pool barriers, and retaining walls over 4 ft in Duval County require a building permit from Jacksonville...
See how Duval County's adu rules rules stack up against other locations.
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