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
| 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
| Rear Setback | 20 feet |
| Side Setback | 5 feet |
| Front Setback | 25 feet |
| Parking Required | 1 space |
| Owner Occupancy | Not required |
| Min Lot Size | 7,500 sq ft |
Permit Process & Fees
| 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 [1][2]
| 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
Most ADU projects are funded through HELOCs, construction loans, or cash-out refinancing. Compare rates from top lenders.
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Rental Income Potential [3][4]
| 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
- Live Local Act ADU provisions expanded (2026): More counties adopting programs
- Miami-Dade ADU ordinance update: Increased max size to 1,000 sq ft (2026)
- St. Petersburg launched ADU incentive program with permit fee waivers
- Florida considering statewide ADU reform bill for 2026 legislative session
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
Sources & References
All data on this page is sourced from official government records and verified market data. View our full methodology.
- HomeAdvisor — 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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