Seminole County, FL: flood zone, zoning and property lines by address
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Towns in Seminole County: Sanford, Altamonte Springs, Oviedo.
Flood zone by address
ParcelSheet reads FEMA's National Flood Hazard Layer at the lot: the zone, whether it is a high risk area where lenders ask for flood insurance, and the base flood elevation where FEMA lists one. FEMA's countywide study for Seminole County has 38 FIRM panels, the newest effective September 2007; no coastal V zones are mapped in it.
The official panel and any Letter of Map Amendment are at FEMA's Map Service Center. An elevation certificate for a Seminole house comes from a licensed surveyor and is often on file with the county or city building office (Building and Permitting).
Property lines
The parcel outline, parcel number and mapped size come from the Florida statewide cadastral (county property appraiser parcels with the Department of Revenue tax roll), so a Seminole lot shows the same lines the property appraiser draws. Seminole County covers about 198,010 acres of land and 23,007 acres of water.
Mapped lines are approximate. The Seminole County Property Appraiser keeps the parcel record; a licensed surveyor sets the true corners.
An example from the county's own records: parcel 01203050413000050 in Sanford, a lot with one house, about 11,599 square feet as mapped, the house built in 1955. Open it to see every card ParcelSheet draws for a Seminole lot.
Zoning
Seminole County zones its unincorporated land, and Sanford, Altamonte Springs, Oviedo each zone the land inside their limits. ParcelSheet shows the use the property appraiser lists for the lot and links Planning and Development for the district, the uses it allows and the lot size it needs.
ADU and guest houses
Florida Statute 163.31771 lets local governments allow an accessory dwelling unit on a lot with a house. Whether a Seminole lot can add one depends on its district; Planning and Development has the rule. ParcelSheet shows the mapped lot size and the ground's slope, the first two things the question turns on.
Septic and soil
ParcelSheet reads the USDA soil survey at the lot: the soil's name, its septic absorption rating and whether it is prime farmland. Seminole County is soil survey area FL117, Seminole County, Florida, last updated September 2026, on Web Soil Survey.
A new or changed septic system in Seminole County needs a permit from the Florida Department of Health in Seminole County, which tests the soil on the lot itself.
Setbacks
Setbacks in Seminole County come from the zoning district: the front, side and rear distances a house must keep. ParcelSheet does not draw setback lines; Planning and Development gives them for the lot's district, and Sanford, Altamonte Springs, Oviedo for land inside their limits.
Hazards that apply
- Sinkholes. The Florida Geological Survey lists 172 subsidence incident reports in Seminole County (the reports). They are reports, not confirmed sinkholes; ParcelSheet does not rate a lot for sinkholes.
- Wind. The Florida Building Code sets the design wind speed for a house in Seminole County; the building office (Building and Permitting) applies it at permit.
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a Seminole lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in Seminole County?
Type the address in the box above and ParcelSheet reads FEMA's flood zone at the lot's center. FEMA's countywide flood map for Seminole County has 38 panels, the newest effective September 2007. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in Seminole County?
Open the Florida map, type the address, and the parcel outline from the county property appraiser shows on the map with its parcel number and mapped size. The Seminole County property appraiser keeps the official record. Mapped lines are approximate; only a licensed surveyor sets the true corners.
What is my property zoned in Seminole County?
Zoning in Seminole County is set by the county for unincorporated land and by each city (such as Sanford, Altamonte Springs) inside its own limits. ParcelSheet shows the use code the property appraiser lists and links the office that sets the zoning; the planning office has the final word.
Can I build an ADU in Seminole County?
Florida Statute 163.31771 lets counties and cities allow an accessory dwelling unit, and each sets its own rules. In Seminole County ask the zoning office for the lot's district first; ParcelSheet shows the lot size as mapped so you can see the room you have.
Do I need a septic permit in Seminole County?
Yes. A new or changed septic system in Seminole County needs a permit from the Florida Department of Health in Seminole County. ParcelSheet shows the USDA soil survey's septic rating at the lot, from survey area FL117 (Seminole County, Florida).
Next to Seminole County: Lake County, Orange County, Volusia County.
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