ADU Questions & Answers: Jacksonville, FL

Can I build an ADU in Jacksonville?

Yes, ADUs are allowed in Select residential districts in Jacksonville, FL. The maximum size for a detached ADU is 25% of primary residence or 750 sq ft (whichever is smaller). Attached ADUs can be up to 25% of primary residence or 750 sq ft. Jacksonville has an ADU-friendliness score of 5/10. Check our full Jacksonville ADU rules page for complete zoning details.

How much does it cost to build an ADU in Jacksonville?

ADU construction in Jacksonville typically costs $125,000-$245,000. The cost per square foot averages $155-$305. Garage conversions are more affordable at $60,000-$145,000, while prefab ADUs cost $90,000-$210,000. Permit fees add $3,200-$5,000 to your budget. See our detailed Jacksonville ADU cost guide.

What are the ADU size limits in Jacksonville?

Detached ADUs in Jacksonville can be up to 25% of primary residence or 750 sq ft. Attached ADUs are limited to 25% of primary residence or 750 sq ft. Junior ADUs (JADUs) have a cap of Not allowed. Maximum height is Must not exceed height of primary residence. You are allowed up to 1 ADU per lot on a qualifying lot.

What are the setback requirements for ADUs in Jacksonville?

Rear setback: 20 feet. Side setback: 5 feet. Front setback: 25 feet. Note that garage conversions may be exempt from setback requirements if the existing structure is already within the setback area.

Do I need parking for an ADU in Jacksonville?

1 space. Many cities and states have been relaxing ADU parking requirements in recent years. In California, no additional parking is required for ADUs near transit.

Is owner-occupancy required for ADUs in Jacksonville?

Required — owner must occupy either the primary residence or the ADU (cannot rent out both) per Ord. 2022-0448-E. Note that owner-occupancy rules vary by state law — California and several other states have eliminated this requirement for standard ADUs.

How long does it take to get an ADU permit in Jacksonville?

The ADU permit review timeline in Jacksonville is typically 80-110 days. Plan check: 3-4 weeks. Pre-approved plans availability: Not available.

How much can I rent my ADU for in Jacksonville?

Average ADU rental income in Jacksonville: 1-bedroom units rent for $1,100-$1,600/month, 2-bedroom units for $1,400-$2,000/month. Short-term rentals: Varies by district. Expected ROI: 6-8% annual return.

What is the minimum lot size for an ADU in Jacksonville?

The minimum lot size for an ADU in Jacksonville is No ADU-specific minimum found (Ord. 2022-0448-E) - underlying district standards apply; verify with the city. This applies to detached ADUs — garage conversions and JADUs may have different or no lot size requirements.

Can I convert my garage into an ADU in Jacksonville?

Garage conversions are one of the most popular and affordable ADU options. In Jacksonville, a garage conversion typically costs $60,000-$145,000. The key advantages are lower cost (no foundation work), potential setback exemptions, and faster permitting. Read our complete garage conversion guide.

About this information: This page is an informational summary of publicly available regulations - it is not legal, financial, or professional advice, and it is not a substitute for confirming requirements with your local planning department. Rules change frequently; always verify current requirements before designing, budgeting, or building. Last verified: 2026-07-07. Contractors we introduce are independent businesses - verify license and insurance directly before hiring. Spotted an error? Tell us - we verify against primary sources and correct quickly.