What ADU can you build in your Jacksonville backyard?
Instant zoning report — see exactly what your zoning allows: permitted ADU types, size limits, setbacks, and lot requirements for your specific property.
The quick answer
Jacksonville ADU rules at a glance
- Max ADU size
Up to 750 sq ft, and smaller than your main home - Owner-occupancy
Required — you must live on the property - Short-term rentals
Allowed with local licensing — verify with the city - Where it's allowed
Eligibility varies by zoning district — check your address to confirm yours
ADU Rules in Jacksonville, Florida
We've researched Jacksonville's ADU rules so you don't have to. Here's what matters most — the facts that determine whether your project is possible, and how much it will cost.
- ADU capped at 25% of the main structure or 750 sq ft, whichever is less (§656.403(g))
- Corrects a 1,000 sq ft / 50% figure
- Homestead (owner-occupancy) required; ADU behind the primary structure
Last verified: 2026-07-15
Backyard ADUs like this are being built across Jacksonville — here's how to do it right.
What Jacksonville's zoning may allow for an ADU
Jacksonville (Duval County) allows an ADU accessory to a conforming single-family home, capped at 25% of the main structure or 750 sq ft (whichever is less). The property must carry a homestead exemption (owner-occupied). This corrects a '1,000 sq ft / 50%' figure — the code cap is 750 sq ft / 25%.
Zoning allowance
An ADU is an allowed accessory use in residential land-use categories, accessory to a conforming single-family dwelling and located behind the primary structure, attached or detached (Ordinance Code §656.403(g)).
Size limits
A Jacksonville ADU's building footprint is limited to 25% of the principal structure's gross floor area or 750 sq ft, whichever is less; it must sit behind the primary structure and not in a required yard (Ordinance Code §656.403(g)). This corrects the unsourced 1,000 sq ft / 50% figure.
Lot + setbacks
Setbacks, lot coverage, and minimum lot size for an accessory dwelling vary by zoning district. Confirm the exact figures with the jurisdiction's planning department (see the verified size and district notes above).
Height + coverage
Height and lot-coverage limits vary by zoning district. Confirm current limits with local planning.
Parking
Parking requirements for an accessory dwelling vary by district; typically one additional space. Confirm with local planning.
Rental / occupancy
The property must be subject to (or applying for) a homestead exemption — i.e., owner-occupied (Ordinance Code §656.403(g)(6)). The code does not separately address renting the ADU or short-term rentals; the homestead requirement means the owner occupies the property.
Permit process
An accessory dwelling is permitted through the jurisdiction's standard building-permit / zoning-review process. Contact the local planning or building department for current requirements.
ADU Size Calculator (25% formula, 750 sq ft cap)
| Primary Home Size | Max ADU Size |
|---|---|
| 1,200 sq ft | 300 sq ft |
| 1,800 sq ft | 450 sq ft |
| 3,000 sq ft (cap triggers) | 750 sq ft (max) |
Whichever is smaller: 25% of primary OR 750 sq ft hard cap. 25% of the principal structure's gross floor area or 750 sq ft, whichever is less; must be behind the primary structure; homestead (owner-occupancy) required
Building limits and rental rules, side by side
These figures are based on the best available data for Jacksonville and should be confirmed with the city's planning department before you commit to a design or a rental strategy — local ordinances change and vary by parcel.
Building Limits
- Max Size:750 sq ft or 25% (lesser)
- Detached Allowed?Check with city
Rental Rules
Owner-Occupancy Required: You must live in either the primary home or the ADU.
Short-term rental rules vary — confirm with Jacksonville Planning.
Here's exactly what you'll pay — and how to avoid the fees that catch most homeowners off guard
Most homeowners spend 3–4 weeks piecing this together on their own. We've mapped the full Jacksonville permit process step by step — so you know exactly what's coming, and what to prepare.
Step 1: Pre-Application Zoning Check
- Where:
- Jacksonville Planning Department
- What to bring:
- Property address and parcel ID, preliminary site sketch, lot survey
- Timeline:
- No appointment fee — call ahead to confirm office hours
- Cost:
- No fee for initial inquiry
Step 2: Submit Permit Application
- Where:
- Jacksonville Planning Department — contact for portal link
- What to bring:
- Architectural plans, site plan, boundary survey, energy compliance docs
- Timeline:
- Contact planning to confirm current review timelines
- Cost:
- Contact planning for current fee schedule
Step 3: Plan Review & Revisions
- Where:
- Jacksonville Planning Department
- What to bring:
- Responses to any correction letters; revised drawings if required
- Timeline:
- Plan for one or more review cycles — timeline varies by submission completeness
- Cost:
- No additional fee for standard resubmittal
Step 4: Construction & Inspections
- Where:
- Jacksonville Building Department
- What to bring:
- Approved permit set must be on-site at all times during construction
- Timeline:
- Schedule inspections as each phase of work is completed
- Cost:
- Included in permit fee
Jacksonville neighborhoods where ADU permits are being filed — is your street next?
Jacksonville ADU — Frequently Asked Questions
These are the questions we hear most often from Jacksonville homeowners. If yours isn't here, our ADU Zoning Experts can answer it directly.
Can I build an ADU in Jacksonville, Florida?
An ADU is an allowed accessory use in residential land-use categories, accessory to a conforming single-family dwelling and located behind the primary structure, attached or detached (Ordinance Code §656.403(g)).
What is the maximum ADU size in Jacksonville?
A Jacksonville ADU's building footprint is limited to 25% of the principal structure's gross floor area or 750 sq ft, whichever is less; it must sit behind the primary structure and not in a required yard (Ordinance Code §656.403(g)). This corrects the unsourced 1,000 sq ft / 50% figure.
Do I need to be an owner-occupant to build an ADU in Jacksonville?
Jacksonville requires owner-occupancy — you must live in either the primary home or the ADU.
Can I use my Jacksonville ADU as an Airbnb?
Contact Jacksonville Planning to confirm current short-term rental rules for ADUs.
How do I get an ADU permit in Jacksonville?
An accessory dwelling is permitted through the jurisdiction's standard building-permit / zoning-review process. Contact the local planning or building department for current requirements.
Nearby Cities — ADU Rules
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Four-jurisdiction breakdown, JaxEPICS permits, real costs ($165K–$310K), military housing demand, and ROI.
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This page provides general information based on current ordinances and publicly available data as of 2026-07-15. Zoning rules change — verify all requirements with your local planning department before making financial commitments.