Gainesville, FL Accessory Structures: ADU Rules (2026)
ADU rules in Gainesville, FL, also called accessory dwelling unit regulations or granny flat ordinances, cover setbacks, owner-occupancy, parking, and permit requirements.
Key Facts
- Max ADUs per lot
- 1 attached + 1 detached
- Size cap
- 850 sq ft each (pre-2/27/2020 exception)
- Density
- Exempt from residential density calculations
- Facade limit
- Detached/added ADU under 50% of front facade
- Utilities
- May share GRU service with main unit
- Resale
- Cannot be sold separately unless subdivided
Summary
Gainesville allows one attached and one detached accessory dwelling unit per lot, exempt from density calculations, capped at 850 square feet each under LDC § 30-5.36. Each ADU must meet the underlying zoning district's setbacks and height limits and be architecturally subordinate to the main house.
B.Standards.1.One attached ADU and one detached ADU may be permitted per lot or parcel, and ADUs are exempt from residential density calculations.2.Each ADU must comply with all standards applicable within the zoning district, including required setbacks and building height limits.3.A non-conforming accessory structure converted to an ADU must meet the requirements of section 30-10.4.4.Each allowed ADU, either attached or detached, may not exceed 850 square feet. Structures exceeding 850 square feet that existed on February 27, 2020, may be converted into ADUs.
Official source re-checked September 7, 2026: no newer edition of the code had been published (publisher’s edition: Code of Ordinances: Supplement 63).
Full Breakdown
36 lets a property owner add up to two ADUs per lot or parcel, one attached and one detached, without those units counting against the lot's residential density calculation. 4's requirements. Size is capped at 850 square feet per ADU, whether attached or detached, with a grandfather exception: a structure that already exceeded 850 square feet as of February 27, 2020, can still be converted into an ADU despite the cap. Design standards require the ADU to read as subordinate to the primary structure in mass, size, height, and architectural character, and its style must be consistent and compatible with the main house.
A new detached ADU, or one added onto an existing structure, cannot make up more than 50 percent of the total facade area that runs parallel to the front property line. ADUs may share existing utility and service infrastructure with the primary unit, subject to Gainesville Regional Utilities standards, but an ADU cannot be sold separately or turned into a condominium unless the property is properly subdivided under the LDC's subdivision requirements. The stated purpose is to give owners flexibility for senior care, family housing, or rental income while adding to the city's affordable housing supply within neighborhood design limits.
Violations & Fines
Building an ADU larger than 850 square feet without qualifying for the pre-2020 exception, exceeding the 50 percent facade limit, ignoring underlying district setbacks or height limits, or selling or condo-ing an ADU without proper subdivision approval are LDC violations. The city can deny or revoke permits and require correction or removal of noncompliant construction through its zoning compliance and Code Enforcement process.
Frequently Asked Questions
How many accessory dwelling units can I build on a Gainesville lot?
What is the maximum size for a Gainesville ADU?
Can I sell my Gainesville ADU as a separate property?
Sources & Official References
Other rules in Gainesville
How Gainesville compares: Easiest Cities to Build an ADU·Florida rules heatmap·Compare Gainesville to another location·View the Florida accessory structures overview
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