DeKalb County, GA zoning map, flood zone and property lines by address
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Towns in DeKalb County: Dunwoody, Redan, Chamblee.
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 DeKalb County has 94 FIRM panels, the newest effective August 2019; 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 DeKalb house comes from a licensed surveyor and is often on file with the county or city building office.
Property lines
The parcel outline, parcel number and mapped size come from the Georgia county parcel layers (each county publishes its own), so a DeKalb lot shows the same lines the county tax assessor draws. DeKalb County covers about 171,295 acres of land and 2,187 acres of water.
Mapped lines are approximate. The DeKalb County tax assessor keeps the parcel record (DeKalb County website); a licensed surveyor sets the true corners.
Zoning
DeKalb County zones its unincorporated land, and Dunwoody, Chamblee each zone the land inside their limits. ParcelSheet shows the use the county tax assessor lists for the lot and links the county planning and zoning office for the district, the uses it allows and the lot size it needs.
ADU and guest houses
Under Georgia's Zoning Procedures Law (Official Code of Georgia Title 36, Chapter 66), local governments can allow an accessory dwelling unit on a lot with a house. Whether a DeKalb lot can add one depends on its district; the county planning and zoning office 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. DeKalb County is soil survey area GA089, DeKalb County, Georgia, last updated September 2026, on Web Soil Survey.
A new or changed septic system in DeKalb County needs a permit from the DeKalb County environmental health office (county board of health, under the Georgia Department of Public Health).
Setbacks
Setbacks in DeKalb County come from the zoning district: the front, side and rear distances a house must keep. ParcelSheet does not draw setback lines; the county zoning office gives them for the lot's district, and Dunwoody and Chamblee for land inside their limits.
Hazards that apply
- Wetlands and wildfire. ParcelSheet shows the National Wetlands Inventory near a DeKalb lot and the Forest Service wildfire hazard rating at it.
Questions
Is my house in a flood zone in DeKalb 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 DeKalb County has 94 panels, the newest effective August 2019. A lender or insurer uses the official FIRM panel; FEMA's Map Service Center has it.
How do I find property lines in DeKalb County?
Open the Georgia map, type the address, and the parcel outline from the DeKalb County tax assessor shows on the map with its parcel number and mapped size. Mapped lines are approximate; only a licensed surveyor sets the true corners.
What is my property zoned in DeKalb County?
Zoning in DeKalb County is set by the county for unincorporated land and by each city (such as Dunwoody, Chamblee) inside its own limits. ParcelSheet shows the use code the county tax assessor lists and links the office that sets the zoning; the planning office has the final word.
Can I build an ADU in DeKalb County?
Under Georgia's Zoning Procedures Law (Official Code of Georgia Title 36, Chapter 66), counties and cities can allow an accessory dwelling unit, and each sets its own rules. In DeKalb 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 DeKalb County?
Yes. A new or changed septic system in DeKalb County needs a permit from the DeKalb County environmental health office (county board of health, under the Georgia Department of Public Health). ParcelSheet shows the USDA soil survey's septic rating at the lot, from survey area GA089 (DeKalb County, Georgia).
What can I build on 5 acres in DeKalb County?
Zoning in DeKalb County is set by the county for unincorporated land and each city inside its own limits (such as Dunwoody, Chamblee). The zoning district decides the uses, how many homes and the smallest lot it allows on 5 acres. ParcelSheet shows the lot size as mapped and the use code on the parcel record; the planning office has the district and its rules. See the DeKalb County website.
What are the residential setbacks in DeKalb County (2026)?
Setbacks in DeKalb County come from the zoning code of the county, or of the city when the lot is inside city limits: the front, side and rear distances depend on the lot's district. ParcelSheet does not draw setback lines or give a number it did not read; the zoning office gives them for the district. See the DeKalb County website.
Next to DeKalb County: Clayton County, Fulton County, Gwinnett County, Henry County, Rockdale County.
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