5 county-level rules, plus city-specific rules for 2 cities in Polk County, Florida.
Verified from official government sources
In unincorporated Polk County an accessory apartment, garage apartment, or guest house is allowed as an accessory use to a single-family home. Only one is permitted per lot, a guest house must sit in the rear yard, and it needs a Level 1 Review.
Polk County LDC Sec. 206.A.1, A.2, A.4
No more than one accessory apartment, garage apartment, or guest house may be permitted on any single-family residential lot or parcel. A guest house shall be located in the rear yard of the principal dwelling unit... Mobile homes shall not be permitted to be used as guest houses.
A storage shed in unincorporated Polk County is an accessory structure that must sit in the side or rear yard and meet the accessory-structure setbacks in LDC Table 2.2. Larger sheds require a building permit; confirm the current setback because the County revised utility-shed rules after 2019.
Polk County LDC Sec. 206 (Accessory Uses)
Accessory uses are permitted in conjunction with the primary use in all land use districts. Accessory uses are those land uses that are incidental and subordinate to the primary use of the property.
Converting a garage into living space or a garage apartment in unincorporated Polk County is treated under the LDC accessory-dwelling rules. A garage apartment counts as one accessory dwelling per lot, must meet accessory setbacks, needs a Level 1 Review, and a building permit is required for the conversion.
Polk County LDC Sec. 206.A
Accessory apartments, garage apartments, and guest houses may be permitted as accessory uses to single-family detached homes in all residential districts... Garage apartments and guest houses shall meet all setbacks pertaining to accessory structures... Accessory dwelling uses shall be permitted subject to a Level 1 Review.
A carport in unincorporated Polk County is an accessory structure under LDC Section 206 and must meet the accessory-structure setbacks in Table 2.2. A permanent, attached, or engineered carport requires a building permit; place it in the side or rear yard clear of the required setbacks.
Polk County LDC Table 2.2, Footnote 6
Front, exterior side, and exterior rear setbacks for principal and accessory structures shall be determined by the distance from the road right-of-way (R/W) or road centerline (C/L), whichever results in the greatest distance from the property line.
Polk County has no separate tiny-home ordinance. A tiny house on a permanent foundation must meet the Florida Building Code and the zoning district's standards; a mobile home is only allowed as a temporary medical-hardship residence under strict LDC limits, not a casual second dwelling.
Polk County LDC Sec. 206.J.1
Mobile homes may be permitted as a temporary special exception in all residential districts, on the same lot or parcel as an existing principal residence, in cases of medical hardship... The mobile home may not be approved on a lot or parcel less than 12,500 square feet or 50 feet in width.
2 cities in Polk County have their own accessory structures rules. Each link goes to that city's dedicated page with code citations.
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