How Jacksonville Handles Accessory Structures: A Practical Guide

Jacksonville maintains 216 local ordinances across all categories, and 9 of those deal specifically with accessory structures. Here is a breakdown of what the city actually requires, what is prohibited, and where Jacksonville falls on the strict-to-permissive spectrum compared to other cities.

Garage Conversions

Garage conversions require building permit from Jacksonville Planning & Development. Converted space must meet FL Building Code habitability standards and zoning minimum parking requirements must still be satisfied.

Key details: Permit: Building permit required. Parking: Must retain 2 off-street spaces. Code: FBC habitability standards. ADU Option: Allowed per FL §163.31771. Ceiling: 7'6" minimum.

Unpermitted conversion: stop-work order, permit fees 4x normal, potential reversal order. Failure to maintain parking: zoning violation citation.

ADU Impact Fees

Jacksonville charges mobility fees on new dwelling units under Zoning Code Ch. 655 Pt. 5, including ADUs, calculated by zone and unit type. Florida HB 1339 (2024) caps ADU impact fees at the single-family rate and exempts qualifying small ADUs in some scenarios. Total ADU permit and fee costs typically range $3,000 to $8,000 in Jacksonville. JEA water/sewer hookups are billed separately by JEA.

Key details: Fee Authority: Ch. 655 Pt. 5 mobility fees. State Cap: FL HB 1339: single-family rate max. Typical Total: $3,000-$8,000. JEA: Utility hookups billed separately.

Failure to pay mobility fees prior to permit issuance prevents the building permit from being released. Liens may be filed under Ch. 655.512 for unpaid impact fees. Operating an ADU without paying applicable fees can result in revocation of the Certificate of Occupancy.

ADU Permits

Jacksonville permits ADUs by right in most single-family residential zones under Ordinance 2022-0448-E (the Keeping Our Families Together Act), codified in Title XVII Zoning Code Ch. 656. Applications are filed through the JaxEPICS online portal. Initial reviews typically take 25-30 business days; resubmittals 10 days or less. Florida HB 1339 (2024) further requires ministerial, by-right approval of ADUs that meet objective standards.

Key details: Authority: Ord. 2022-0448-E; Ch. 656. Portal: JaxEPICS online. Initial Review: 25-30 business days. State Override: FL HB 1339 (2024) ministerial.

Unpermitted ADU construction is a Ch. 656 zoning violation enforced by Municipal Code Compliance. Stop-work orders are issued for work without permits under Florida Building Code Sec. 105. Failure to obtain a Certificate of Occupancy prevents legal occupancy. Daily civil penalties accrue under Ch. 609 until compliance.

ADU Rental Restrictions

Jacksonville ADUs may be rented long-term (30+ days) without a separate license. Rentals under 30 days are classified as short-term vacation rentals and must comply with Florida Statute 509 transient public lodging registration plus Jacksonville's Ch. 656 short-term rental zoning rules. Local STR ordinances are limited by Florida Statute 509.032(7), which preempts most local STR bans. Tax registration with the Florida DOR and Duval County Tax Collector is required for stays under 6 months.

Key details: Long-Term (30+ days): No license needed. Short-Term (<30 days): DBPR license + TDT. State Tax: 6% sales + 7% Duval TDT. Preemption: FS 509.032(7).

Operating a short-term rental without a DBPR public lodging license is a violation of FS 509.241. Unpaid TDT is recoverable by the Duval Tax Collector with interest and penalties. Jacksonville may cite under Ch. 656 for STR zoning violations where applicable.

ADU Owner Occupancy

Jacksonville does not impose an owner-occupancy requirement on ADUs. Ordinance 2022-0448-E removed owner-occupancy and family-relationship restrictions from the prior ADU rules, and Florida HB 1339 (2024) preempts local owner-occupancy mandates statewide. An owner may live in either the primary residence or the ADU, rent both units, or rent only one - no deed restriction is required.

Key details: Owner-Occupancy: Not required. State Law: FL HB 1339 (2024) preempts. Local Ord.: 2022-0448-E removed prior rule. Deed Restriction: None required.

No city violation exists for non-owner-occupancy. HOA enforcement of owner-occupancy covenants is a private civil matter.

Jacksonville is more permissive than most cities when it comes to adu owner occupancy. That said, there are still limits.

Shed Rules

Jacksonville Building Inspection Division requires a permit for sheds over 150 sq ft. Sheds under 150 sq ft may need only a permit (no inspection). Setbacks and lot coverage rules under §656.403 apply.

Key details: Permit Required: Sheds >150 sq ft. Inspection: Required for >150 sq ft. Setbacks: Rear/side: 3–5 ft minimum. Code: §656.403.

Unpermitted structures receive a notice to either obtain a retroactive permit (with double fees) or remove the structure within 60 days. Fines of $100–$500 apply for non-compliance.

ADU Rules

Jacksonville §656.403 permits ADUs in single-family residential districts. Max size: lesser of 25% of principal structure GFA or 750 sq ft. ADUs must be in backyard, owner-occupancy required for rental. Full kitchen allowed.

Key details: Max Size: 25% of principal GFA or 750 sq ft. Location: Backyard only. Owner-Occupancy: Required if ADU is rented. Code: §656.403. State Law: FL §163.31771 (by Dec 2026).

Unpermitted ADUs face stop-work orders and removal or legalization requirements. Fines of $500–$2,000 apply for unpermitted construction. Properties with illegal ADUs may face title issues at sale.

Tiny Homes

Tiny homes in Jacksonville must comply with the Florida Building Code and local zoning under Ch. 656. A tiny home on a permanent foundation is treated as a dwelling unit and must meet all building code requirements including minimum standards. Tiny homes on wheels are classified as recreational vehicles and generally cannot serve as primary residences in residential zones. Mobile and manufactured homes are permitted only in designated zoning districts. ADU (accessory dwelling unit) ordinances may provide additional options.

Key details: Permanent Foundation: Must meet Florida Building Code as dwelling unit. On Wheels: Classified as RV; cannot be primary residence in residential zones. Zoning: Ch. 656 regulates permitted dwelling types by district. Manufactured Homes: Only in designated zoning districts. ADUs: Accessory dwelling units may provide alternative pathway.

Occupying a THOW as a primary residence in a non-permitted zone: $100–$500/day zoning violation. Building a tiny home without permits: standard building code violation fines. Minimum size violations: variance required.

Carport Rules

Carports in Jacksonville are regulated as accessory structures under Jax Ord. Code Ch. 656 (Zoning Code). They can only be located in rear or side yards — not in required front yard setback areas. Setbacks for accessory structures are typically 5 feet from the principal structure and 5 feet from property lines, though overlay zones like San Marco (§656.399.7) may have additional requirements. A building permit is required for permanent carport construction.

Key details: Location: Rear or side yards only; not in required front yard. Setback: 5 ft from principal structure and property lines (typical). Permit: Building permit required for permanent construction. Code Section: Jax Ord. Code Ch. 656 (Zoning). Overlay Zones: Additional standards may apply (e.g., San Marco §656.399.7).

Building without permit: $300–$1,000 fine plus required inspection. Setback violations: removal or modification order. Encroachment on right-of-way: immediate removal required.

The Bottom Line

Jacksonville's accessory structures rules are a mixed bag. Some areas are strict, others are relaxed, and the details matter. The best approach is to check the specific rule that applies to your situation rather than assuming Jacksonville is broadly strict or permissive.

All of the above reflects Jacksonville's municipal code as of our last review. If you need specifics on fines, exemptions, or filing requirements, the detailed ordinance pages linked above have the full breakdown.