Accessory Structures in Jacksonville, FL

Jacksonville maintains 154 local ordinances across all categories, and 2 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.

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).

Shed & Carport Rules

Garden sheds and toolhouses are permitted accessory structures in Jacksonville but must meet height-based setbacks from the lot line.

Key details: Governing section: Ordinance Code § 656.403. Setback (under 15 ft tall): 5 feet from lot line. Setback (over 15 ft tall): same as primary structure. Boathouse/shelter cap: 900 square feet. Front yard placement: Not allowed.

Code Enforcement can order removal or relocation of a noncompliant accessory structure; the Building Official may also require a permit before work proceeds.

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.