ADU rules in Seminole County, FL — also called accessory dwelling unit regulations or granny flat ordinances — cover setbacks, owner-occupancy, parking, and permit requirements.
Unincorporated Seminole County allows accessory dwelling units under Land Development Code Sec. 30.6.1.3, but the owner must live in either the ADU or the primary home, the ADU can't be sold separately, and it can't be used as a short-term rental.
The county's ADU standards (SCLDC 30.6.1.3) tie an ADU to the primary dwelling on the same parcel. One unit or the other must always be occupied by the property owner, and the ADU cannot be subdivided or conveyed into separate ownership. Any rental must be for a minimum of 30 days, so vacation/short-term rental of an ADU is prohibited. At least one off-street parking space must serve the ADU on the same driveway as the primary home, and it may not sit in a required buffer, setback, or to the rear of the unit. HOA covenants may add stricter limits. Inside the cities (Sanford, Oviedo, etc.) city zoning governs instead.
Using the ADU contrary to the signed owner acknowledgment can trigger Seminole County Code Enforcement action, since zoning approval is contingent on the stated use.
Other ordinances people look up for this city. Green dot = verified primary-source excerpt.
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See how Seminole County's adu rules rules stack up against other locations.
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