Jacksonville's ADU policies are emerging, with the city gradually allowing more accessory units. Regulations vary by neighborhood district, and flood resilience remains a significant consideration due to coastal proximity and St. Johns River influence.
Zoning & Size Requirements [1][2]
Yes, you can build an ADU in Jacksonville. A detached ADU can be up to 750 sq ft under current Florida and Jacksonville zoning rules.
| Allowed Zones | Select residential districts |
| Max Size (Detached) | 25% of primary residence or 750 sq ft (whichever is smaller) |
| Max Size (Attached) | 25% of primary residence or 750 sq ft (whichever is smaller) |
| Max Size (JADU) | Not allowed |
| Max Height | Must not exceed height of primary residence |
| Max Units | 1 ADU per lot |
Setback Requirements [1][2]
Jacksonville requires a rear setback of about 20 ft for a detached ADU, and one off-street parking space is required. Owner-occupancy is required.
| Rear Setback | 20 feet |
| Side Setback | 5 feet |
| Front Setback | 25 feet |
| Parking Required | 1 space |
| Owner Occupancy | Required — owner must occupy either the primary residence or the ADU (cannot rent out both) per Ord. 2022-0448-E |
| Min Lot Size | 7,500 sq ft |
Permit Process & Fees
An ADU permit in Jacksonville typically costs $3,200-$5,000 and takes 80-110 days, through a standard permit review.
| Approval Process | Building permit with district review |
| Review Timeline | 80-110 days |
| Permit Fees | $3,200-$5,000 |
| Impact Fees | $1,300-$2,000 |
| Plan Check | 3-4 weeks |
| Pre-Approved Plans | Not available |
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Construction Costs [3][4]
Building an ADU in Jacksonville typically costs $125,000-$245,000 ($155-$305 per sq ft); a garage conversion runs $60,000-$145,000.
| Average Build Cost | $125,000-$245,000 |
| Cost per Sq Ft | $155-$305 |
| Garage Conversion | $60,000-$145,000 |
| Prefab ADU (Installed) | $90,000-$210,000 |
Finance Your ADU Project
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Rental Income Potential [5][6]
A 2-bedroom ADU in Jacksonville rents for around $1,400-$2,000/mo, an estimated 6-8% annual return.
| Avg Rent (1 Bedroom) | $1,100-$1,600/mo |
| Avg Rent (2 Bedroom) | $1,400-$2,000/mo |
| Short-Term Rental | Varies by district |
| Est. Annual ROI | 6-8% annual return |
Explore Prefab ADU Options
Prefab ADUs can save 20-40% vs. traditional construction and cut build time in half.
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Recent Law Changes
What's Changed Recently
- Florida SB 48 (2026 session): statewide ADU mandate passed the Senate 38-0 (Feb 2026) but died in the House on the final day of session (Mar 13, 2026) over a short-term-rental dispute — local rules still govern; reform widely expected to return in 2027
- Jacksonville's 'Keeping Our Families Together Act' (Ord. 2022-0448-E, enacted Nov 9, 2022) legalized ADUs in most single-family zones, removing the prior RLD-TND-only limit and allowing full kitchens
- ADU max size is the lesser of 25% of the primary residence or 750 sq ft; the ADU may not exceed the height of the primary residence
- Owner-occupancy required — the owner must live in either the primary residence or the ADU and cannot rent out both units (Ord. 2022-0448-E)
Tips for Building an ADU in Jacksonville
- District-specific rules vary significantly; verify your neighborhood's rules
- River proximity may require additional flood mitigation
- Jacksonville's expansion areas offer lower-cost ADU opportunities
- Diverse neighborhoods mean varied rental markets; location research critical
ADU Builders in Jacksonville
Looking for an ADU builder in Jacksonville? ADU projects need a contractor experienced with local zoning, the permit process, and utility connections — not every general contractor has built one. We match Jacksonville homeowners with experienced local ADU contractors who provide free, no-obligation quotes. Getting at least three bids typically saves 20-40% on the same scope.
Sources & References
All data on this page is sourced from official government records and verified market data. View our full methodology.
- Ordinance 2022-0448-E — City of Jacksonville (ADU legalization) Municipal Code — Accessed 2026-06-28
- Jacksonville Planning & Development Department Planning Department — Accessed 2026-06-28
- Angi — ADU Construction Cost Data Market Data — Accessed 2026-02-24
- Angi — Local ADU Contractor Costs Market Data — Accessed 2026-02-24
- Zillow Rental Manager — Market Rent Data Market Data — Accessed 2026-02-24
- HUD Fair Market Rents Government Data — Accessed 2026-02-24
- Jacksonville Planning & Development — Zoning Planning Department — Accessed 2026-02-24
- Florida Live Local Act — ADU Provisions Government Data — Accessed 2026-02-24
Frequently Asked Questions
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