Accessory Structures in St. Lucie County, FL (2026)
4 county-level rules, plus city-specific rules for 1 city in St. Lucie County, Florida.
Verified from official government sources
ADU Rules
The St. Lucie County Land Development Code has no separate ADU or guest-house use; a second living unit is treated as an accessory structure and is capped in size. Florida law (F.S. 163.31771) lets counties choose to allow ADUs in single-family zones.
ADU Rules in St. Lucie County, FL: No Separate Category
Some RestrictionsF.S. 163.31771(2)
A local government may adopt an ordinance to allow accessory dwelling units in any area zoned for single-family residential use.
Shed & Carport Rules
In unincorporated St. Lucie County, a storage shed is an accessory structure. Under LDC 8.00.02(B) all accessory structures together may not cover more than 35% of the lot's permitted building area, and a Florida Building Code permit is generally required.
Shed Rules in St. Lucie County, FL: 35% Coverage Cap
Some RestrictionsSLC LDC 8.00.02(B)
No accessory structure or use in any residential zoning district shall occupy more than thirty-five percent (35%) of the maximum permitted building area of the entire lot.
Garage Conversions
Converting a garage to living space in unincorporated St. Lucie County is a Florida Building Code change-of-use needing a permit. The new area must meet zoning, and required off-street parking removed from the garage must be replaced elsewhere on the lot.
Garage Conversions in St. Lucie County, FL: Permit & Parking
Some RestrictionsSLC LDC 8.00.01
Accessory structures and uses are permitted in any zoning district in connection with any principal lawfully existing permitted use within such district... provided that all accessory structures or uses shall meet the requirements for the zoning district in which the structure or use is located.
Tiny Homes
St. Lucie County has no tiny-home ordinance. A site-built tiny house on a foundation is a dwelling under the Florida Building Code and zoning; a tiny house on wheels is recreational equipment that LDC 8.00.03 says may not be used for living or sleeping.
Tiny Homes in St. Lucie County, FL: Dwelling vs. RV
Some RestrictionsSLC LDC 8.00.03(F)(3)
Recreational equipment shall not be used for living, sleeping or housekeeping purposes.
Accessory Structures by City in St. Lucie County
1 cities in St. Lucie County have their own accessory structures rules. Each link goes to that city's dedicated page with code citations.
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