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Marion County, FL Accessory Structures: ADU Rules (2026)

Some Restrictions

Compiled from the official code textEditor Martyn O'NeillLast verified June 2026

ADU rules in Marion County, FL, also called accessory dwelling unit regulations or granny flat ordinances, cover setbacks, owner-occupancy, parking, and permit requirements.

Key Facts

Code Section: Marion County LDC Sec. 4.3.18
Term Used: Family/guest cottage/apartment
Location: Rear or side yard of principal dwelling
A-1 Zone Exception: Front yard allowed
Size: Smaller than primary structure
Permit Timeline: 30 business days (FS 553.792)

ADU Eligibility Quick-Check

An Accessory Dwelling Unit (ADU) is a smaller, independent living unit on the same lot as a single-family home: converted garages, detached cottages, basement or attic conversions, and attached additions all qualify. Most states have streamlined ADU permitting since 2020, but local rules still control size, height, and setback.

Is your lot zoned single-family or multi-family residential?
Does your lot have at least 1,200 sq ft of buildable space?
Is your existing home owner-occupied (in most states this is not required, but some require it for ADU permits)?
Will the ADU stay under your state's size cap (commonly 850-1,200 sq ft for detached)?
Can you provide one off-street parking space (waived in many states within 0.5 mi of transit)?

If you answered 'yes' to most of these, you likely qualify in Florida under recent ADU streamlining laws. The Marion County, FL rules below cover local size, height, and setback requirements.

Summary

In unincorporated Marion County, an accessory dwelling unit is regulated as a 'family/guest cottage/apartment' under Land Development Code Sec. 4.3.18, defined as a non-commercial dwelling unit smaller than the primary structure and located in the rear or side yard of the principal dwelling.

These county ordinances apply to unincorporated areas of Marion County. Incorporated cities within the county may have their own rules that take precedence over county-level regulations.

The family/guest cottage/apartment is an accessory non-commercial dwelling unit designed as an independent living unit smaller than the primary structure, which may be connected to the utility systems of the primary dwelling. The family/guest cottage/apartment may be constructed on a concrete foundation or slab, and shall be located in the rear or side yard of a principal dwelling.

View official code

Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 122 | Land Development Code: Supplement 7).

Full Breakdown

Marion County does not use the term 'accessory dwelling unit' but provides for the same use as a 'family/guest cottage/apartment' under Land Development Code (LDC) Sec. 18 (adopted by Ord. No. 17-08, April 11, 2017). The cottage/apartment is an accessory non-commercial dwelling unit designed as an independent living unit smaller than the primary structure, which may be connected to the utility systems of the primary dwelling. It may be constructed on a concrete foundation or slab and must be located in the rear or side yard of a principal dwelling, except that in the A-1 'General Agriculture' zoning classification it may be located in the front yard and/or forward of the principal single-family dwelling.

Because it is an accessory use, a principal dwelling must already exist on the lot (see LDC Sec. 27). Construction requires a building permit; under Florida Statutes Sec. 792(1)(a), the county must act on a complete residential or accessory-structure permit application within 30 business days for structures under 7,500 square feet. Applicants should verify zoning-district eligibility and setbacks with Marion County Growth Services at 2710 E. Silver Springs Blvd, Ocala.

Violations & Fines

Building or occupying a family/guest cottage/apartment without zoning approval and a building permit is a Land Development Code violation enforced by Marion County Code Enforcement under LDC Article 9, which may issue notices of violation, code-enforcement liens, and orders to bring the structure into compliance or remove it.

Frequently Asked Questions

Does Marion County allow accessory dwelling units (ADUs)?

Yes, but they are regulated as a 'family/guest cottage/apartment' under Land Development Code Sec. 4.3.18 rather than the term 'ADU.' The unit must be an accessory non-commercial dwelling smaller than the primary structure, may share utilities with the main house, and must sit in the rear or side yard of the principal dwelling (or the front yard only in the A-1 General Agriculture zone).

Can my Marion County guest cottage have its own foundation and utilities?

Yes. Per LDC Sec. 4.3.18, a family/guest cottage/apartment may be constructed on a concrete foundation or slab and may be connected to the utility systems of the primary dwelling. It must still be smaller than the primary structure and obtain a building permit.

Sources & Official References

Other rules in Marion County

Noise Ordinances: Construction HoursSome Restrictions Shed & Carport RulesFew Restrictions Garage ConversionsSome Restrictions Noise Ordinances: Vehicle NoiseFew Restrictions Noise Ordinances: Decibel LimitsSome Restrictions Noise Ordinances: Aircraft NoiseFew Restrictions Noise Ordinances: Barking DogsSome Restrictions Noise Ordinances: Amplified Music & Outdoor SoundHeavy Restrictions

All Marion County rules

How Marion County compares: Easiest Cities to Build an ADU·Florida rules heatmap·Compare Marion County to another location·View the Florida accessory structures overview

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