What is the maximum ADU size allowed in Jacksonville?

Detached ADUs in Jacksonville can be up to 1000 square feet.

ADU Builders & Contractors in Jacksonville, FL

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

The average cost ranges from $100,000 to $275,000, or $150-300 per square foot.

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

The permit process typically takes 6 to 12 weeks in Jacksonville.

Jacksonville offers Florida's lowest ADU permit fees at roughly $800, making it the most affordable city to start an ADU project in the state. Construction costs run $120–$300 per square foot, with the city's large lots providing space for detached units up to 1,200 sq ft. Florida's statewide law ensures single-family homeowners can build one ADU by right. An ADU contractor in Jacksonville can deliver a completed unit in 6–9 months.

📊 ADU Quick Facts for Jacksonville

Avg. Cost/sqft

$150-$300

Permit Timeline

6-12 weeks

Max Size

1000 sqft

Setbacks

5ft sides

View Jacksonville Planning Department →

Top 121 ADU Contractors in Jacksonville

🏗️

#1Ecobuild Group Inc

Jacksonville, FL

★★★★★

5.0(164 reviews)

Ecobuild Group Inc — licensed ADU contractor in Jacksonville, FL.

View Profile 📞 (904) 201-9712

🏗️

#2Red Stag Contracting, Inc.

Jacksonville, FL

★★★★★

5.0(45 reviews)

Red Stag Contracting, Inc. — licensed ADU contractor in Jacksonville, FL.

View Profile 📞 (904) 880-4681

🏗️

#3Horizon Roofing And Construction LLC

Jacksonville, FL

★★★★★

5.0(35 reviews)

Horizon Roofing And Construction LLC — licensed ADU contractor in Jacksonville, FL.

View Profile 📞 (904) 626-8309

🏗️

#4Nexus Contracting Inc

Jacksonville, FL

★★★★★

5.0(15 reviews)

Nexus Contracting Inc — licensed ADU contractor in Jacksonville, FL.

View Profile 📞 (904) 377-0660

🏗️

#5Roof Tarp Now Inc

Jacksonville, FL

★★★★★

5.0(13 reviews)

Roof Tarp Now Inc — licensed ADU contractor in Jacksonville, FL.

View Profile 📞 (904) 414-4153

🏗️

#6Construction Expert Inc

Jacksonville, FL

★★★★★

5.0(11 reviews)

Construction Expert Inc — licensed ADU contractor in Jacksonville, FL.

View Profile 📞 (904) 840-5700

🏗️

#7Construction Expert Inc

Jacksonville, FL

★★★★★

5.0(11 reviews)

Construction Expert Inc — licensed ADU contractor in Jacksonville, FL.

View Profile 📞 (904) 840-5700

🏗️

#8River Roofing, LLC

Jacksonville, FL

★★★★★

5.0(9 reviews)

River Roofing, LLC — licensed ADU contractor in Jacksonville, FL.

View Profile 📞 (904) 909-8645

🏗️

#9Florida Development and Construction Corporation

Jacksonville, FL

★★★★★

5.0(9 reviews)

Florida Development and Construction Corporation — licensed ADU contractor in Jacksonville, FL.

View Profile 📞 (954) 707-1309

🏗️

#10Florida Development and Construction Corporation

Jacksonville, FL

★★★★★

5.0(9 reviews)

Florida Development and Construction Corporation — licensed ADU contractor in Jacksonville, FL.

View Profile 📞 (954) 707-1309

View All 121 Contractors →

💰 How Much Does an ADU Cost in Jacksonville?

Garage Conversion

$50,000 - $130,000

Converting existing garage to living space

Detached ADU

$100,000 - $275,000

New standalone unit (600-1,200 sqft)

Permit & Fees

$800 - $5,000

Plan check, permits, utility connections

* Costs vary based on size, finishes, site conditions, and contractor. Get quotes from multiple Jacksonville contractors to compare pricing.

❓ Frequently Asked Questions About ADUs in Jacksonville

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

The average cost to build an ADU in Jacksonville ranges from $100,000 to $275,000, or approximately $150 to $300 per square foot. Garage conversions typically cost $50,000 to $130,000.

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

The ADU permit process in Jacksonville typically takes 6 to 12 weeks. California law requires cities to approve or deny ADU permits within 60 days of receiving a complete application.

What are the ADU size limits in Jacksonville?▼

In Jacksonville, detached ADUs can be up to 1000 square feet. Attached ADUs are limited to 50% of the primary dwelling or 1,200 sqft, whichever is less. Junior ADUs (JADUs) are limited to 500 sqft and must be within the existing home.

What is the setback requirement for ADUs in Jacksonville?▼

Jacksonville requires 5-foot setbacks from side property lines and 5-foot setbacks from rear property lines for new ADU construction. Converted structures (like existing garages) may maintain their current setbacks.

Do I need to provide parking for my ADU in Jacksonville?▼

No parking is required for ADUs in Jacksonville if your property is within half a mile of public transit, in a historic district, part of an existing multi-family building, or if the ADU is a garage conversion. Otherwise, one space may be required.

Also See ADU Contractors In

Miami (224)Tampa (223)Orlando (117)Naples (110)Sarasota (103)Fort Myers (91)Cape Coral (83)Clearwater (62)

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