Florida ADU Rules by County

All 67 Counties

Maximum ADU size by county

Inside city limits, the city's rules apply instead. ADU rules are set locally and can change, so always confirm with the local zoning department.

Alachua	1,700 sq ft or 50% of the main home, whichever is greater Published county rule
Baker	No published rule — estimate from nearby counties Estimate
Bay	No published rule — estimate from nearby counties Estimate
Bradford	No published rule — estimate from nearby counties Estimate
Brevard	Brevard hasn't published an ADU size cap in our records. Right now it allows guest houses (non-rentable) rather than true ADUs, pending its Dec 1, 2026 ordinance. Published county rule
Broward	Varies by city — typically 400–800 sq ft, up to about 50% of the main home Published county rule
Calhoun	No published rule — estimate from nearby counties Estimate
Charlotte	Guest suites only for now (no kitchen allowed). Accessory buildings are capped at 1,000 sq ft on smaller lots, and up to 3,000 sq ft total on lots of half an acre or more. A full ADU ordinance is due by Dec 1, 2026. Published county rule
Citrus	850 sq ft (county guest cottage) Published county rule
Clay	1,000 sq ft or 40% of the main home, whichever is less Published county rule
Collier	750 sq ft or 35% of the main home, whichever is less Published county rule
Columbia	800 sq ft or 75% of the main home, whichever is less Published county rule
DeSoto	No published rule — estimate from nearby counties Estimate
Dixie	No published rule — estimate from nearby counties Estimate
Duval	750 sq ft or 25% of the main home, whichever is less Published county rule
Escambia	Set by each zoning district's size rules, so it varies by parcel — the county can confirm your district's cap. Published county rule
Flagler	Flagler hasn't published an ADU size cap in our records. Right now it allows guest houses (non-rentable) rather than true ADUs, pending its Dec 1, 2026 ordinance. Published county rule
Franklin	No published rule — estimate from nearby counties Estimate
Gadsden	No published rule — estimate from nearby counties Estimate
Gilchrist	No published rule — estimate from nearby counties Estimate
Glades	No published rule — estimate from nearby counties Estimate
Gulf	No published rule — estimate from nearby counties Estimate
Hamilton	No published rule — estimate from nearby counties Estimate
Hardee	No published rule — estimate from nearby counties Estimate
Hendry	No published rule — estimate from nearby counties Estimate
Hernando	Hernando hasn't published an ADU size cap in our records. Published county rule
Highlands	Highlands hasn't published an ADU size cap in our records. Right now it allows guest houses (non-rentable) rather than true ADUs, pending its Dec 1, 2026 ordinance. Published county rule
Hillsborough	750 sq ft or 35% of the main home, whichever is less Published county rule
Holmes	No published rule — estimate from nearby counties Estimate
Indian River	1,200 sq ft or 50% of the main home, whichever is less Published county rule
Jackson	No published rule — estimate from nearby counties Estimate
Jefferson	No published rule — estimate from nearby counties Estimate
Lafayette	No published rule — estimate from nearby counties Estimate
Lake	1,300 sq ft or 70% of the main home, whichever is greater Published county rule
Lee	750 sq ft or 35% of the main home, whichever is less Published county rule
Leon	500–1,200 sq ft Published county rule
Levy	No published rule — estimate from nearby counties Estimate
Liberty	No published rule — estimate from nearby counties Estimate
Madison	No published rule — estimate from nearby counties Estimate
Manatee	Up to 80% of the main home Published county rule
Marion	No fixed cap — the ADU just has to stay smaller than the main home Published county rule
Martin	850 sq ft or 50% of the main home, whichever is less Published county rule
Miami-Dade	400–800 sq ft (RU-1 districts) Published county rule
Monroe	800 sq ft or 40% of the main home, whichever is less Published county rule
Nassau	800 sq ft or 50% of the main home, whichever is less Published county rule
Okaloosa	Can't be larger than the main home Published county rule
Okeechobee	About 400 sq ft under current county code Published county rule
Orange	1,000 sq ft or 45% of the main home, whichever is less Published county rule
Osceola	Not published in our records — the county sets it by zoning district. Under Florida law, compliant ADUs generally can't be capped below 1,000 sq ft or restricted below 500 sq ft. Published county rule
Palm Beach	800 sq ft on lots under 1 acre; 1,000 sq ft on lots of 1 acre or more Published county rule
Pasco	Up to 1,200 sq ft Published county rule
Pinellas	1,000 sq ft standard Published county rule
Polk	1,000 sq ft or 50% of the main home, whichever is less Published county rule
Putnam	Putnam hasn't published an ADU size cap in our records. Published county rule
Santa Rosa	Up to 50% of the main home Published county rule
Sarasota	500 sq ft (unincorporated county) Published county rule
Seminole	1,000 sq ft or 35% of the main home, whichever is less Published county rule
St. Johns	St. Johns hasn't published an ADU size cap in our records. Published county rule
St. Lucie	Not published in our records for the unincorporated county. Under Florida law, compliant ADU applications can't be capped below 1,000 sq ft. Published county rule
Sumter	1,200 sq ft or 40% of the main home, whichever is less Published county rule
Suwannee	No published rule — estimate from nearby counties Estimate
Taylor	No published rule — estimate from nearby counties Estimate
Union	No published rule — estimate from nearby counties Estimate
Volusia	50% of the main home; on lots under 1 acre, also capped at 1,200 sq ft Published county rule
Wakulla	No published rule — estimate from nearby counties Estimate
Walton	Under 800 sq ft Published county rule
Washington	No published rule — estimate from nearby counties Estimate

Zoning is set locally and changes often. Answers are guidance only, not a permit guarantee. Always confirm with the local building/zoning department before purchase.