Fort Myers, FL Accessory Structures: ADU Rules (2026)

Fort Myers Land Development Code § 118.3.11 (referenced through the accessory use provisions of § 118.3.4) governs non-commercial guesthouses, cottages, and garage apartments as accessory dwellings to a principal single-family residence. Under § 118.3.4.B, garage apartments are only permitted in the Dean Park Historic District, where they are recognized as a contributing element to that neighborhood's historic character. Detached and attached guest cottages may be allowed in single-family residential zones (RS-E, RS-5, RS-6, RS-7, RS-D) subject to the accessory use standards: the accessory dwelling must be clearly incidental and subordinate to the principal residence; total accessory structure floor area may not exceed 30% of the principal structure's gross floor area; the accessory dwelling must sit on the same lot as the principal residence; it must meet the zone's setback standards (front setback typically 20 ft; rear and interior side setbacks 10 ft for principal-scale structures, or 5 ft for accessory structures under 200 sq ft per § 118.3.4.A); and it cannot be located in the front setback or in waterfront/easement areas. The guest house counts as part of the principal residence for density purposes — meaning it does not consume an additional density unit. The unit must connect to the principal home's water and sewer service and cannot be sold separately. Florida does not have a statewide ADU preemption like Colorado HB24-1152, so local rules govern. Short-term rental of an accessory dwelling is subject to Fort Myers's general STR rules and FS 509.032(7)(b). A building permit and zoning review are required.