Building permits, zoning and septic rules in Thomson, Georgia

At a glance

Building permit

Required for new homes and additions; apply at 210 Railroad Street¹

Zoning

City of Thomson zoning ordinance (Chapter 22), administered through the county planning office²

Building code

International Residential Code 2024 with Georgia amendments (2026)⁴

Septic

McDuffie County Health Department site approval, only where municipal water or sewer is not available³

Driveway

County road department permit must be approved before a building permit issues⁵

Owner-builder

Georgia does not require a state license to build your own home; local permits still apply⁶

Accessory structure setbacks

5 ft side and rear for 399 sq ft or less; 10 ft for 400 sq ft or more⁷

Who to call

Contact details are copied from each office’s official page and were checked against it on October 16, 2026.

Do you need a building permit in Thomson, Georgia?

Yes. Anyone building a new home or an addition in Thomson applies for construction permits at 210 Railroad Street⁸. New single-family homes also need plans submitted, a requirement in effect since 2013, and contractors buying permits must show a state license, liability insurance and a bond¹. Accessory structures, mobile home placement, storage buildings and signs need permits too¹. The city's published example is a $40 permit for an accessory structure valued at $4000 or under¹.

Thomson construction is built to the International Residential Code, 2024 edition, with Georgia amendments (2026)⁴. Inspections are required on new houses, including footer or slab, rough-in, electrical release and final, and the owner calls the planning office to request each one⁹. A certificate of occupancy requires all work to be complete and the address displayed¹⁰.

Who issues building permits in Thomson, and how do you reach them?

Building permits for land inside Thomson are handled at the joint McDuffie County and City of Thomson office at 210 Railroad Street, Thomson, GA 30824, phone 706-595-1781⁸. The city's permit procedures are handled by the McDuffie County Planning Commission¹¹. A fee schedule is published for both the city and the county, though we have not reviewed its line items¹².

Georgia does not require a state license to build your own home, but the owner must still comply with all required local building codes and regulations⁶. Whether Thomson has its own owner-builder registration procedure inside city limits is something we could not confirm; ask the Community Development office before you apply.

Does Thomson have zoning, and what does it mean for RVs, tiny homes and setbacks?

Thomson has its own zoning, set out in Chapter 22 of the city code, and McDuffie County administers it by contract through the county planning commission and community development department². The city's regulations differ from the county's, so a rule you read for unincorporated McDuffie County may not apply inside Thomson². The city also has subdivision regulations covering residential, commercial and industrial subdivisions¹³.

For sheds, carports and other accessory structures, the setback is 5 feet from side and rear lot lines for structures of 399 square feet or less, and 10 feet for structures of 400 square feet or more⁷. District-by-district setbacks, minimum lot size and minimum home size are in the zoning ordinance, which we did not confirm in detail.

We could not confirm whether Thomson allows living in an RV or a tiny home on a lot; call Community Development at 706-595-1781 before you buy⁸. Georgia leaves tiny-home siting to the local government, and local zoning controls where one can go¹⁴.

How do septic permits work inside Thomson?

Septic approval applies only on lots inside Thomson where municipal water or sewer is not available, and the McDuffie County Health Department issues the site approval³. The planning commission decides whether city utilities are available³. The health department's letter then goes to the planning commission with your building permit application¹⁵.

Where a public sewer is within 200 feet of the property line or in a public right-of-way abutting it, Georgia requires connection to it¹⁶. Septic permits are a county health matter even inside the city; the city planning office does not issue them. The McDuffie County Health Department is at 307 Greenway Street, phone (706) 595-1740¹⁷. In McDuffie County overall, about 76% of soils rate as not limited for a conventional drain field¹⁸, which is county-wide and not specific to any city lot.

Building a home in Thomson: the steps, in order

1. Confirm the lot is inside Thomson city limits and check its zoning district with Community Development at 706-595-1781²⁸.
2. Get the driveway permit approved by the McDuffie County road department; no building permit can be issued before it⁵.
3. If city water or sewer is not available to the lot, get septic site approval from the McDuffie County Health Department³.
4. Apply for construction permits at 210 Railroad Street, bringing plans for a new single-family home and the health department letter if one applies¹¹⁵.
5. Call the planning office to request each required inspection⁹.
6. Finish all work and display the address to receive a certificate of occupancy¹⁰.

What stays with McDuffie County, and what should you check before you buy in Thomson?

The county road department, not the city, issues the driveway permit that a Thomson building permit depends on⁵. Septic site approval also stays with the county health department³. For land outside city limits, use the McDuffie County page, since the city's rules do not apply there.

Check floodplain status first: anyone building in a designated floodplain must comply with the city and FEMA requirements, and Thomson's flood hazard areas include the Jones Road/Norris School area and Whites Creek west of Shadowmoor¹⁹. Property taxes are set county-wide: McDuffie County's effective rate is 0.8%²⁰.

Watch-outs

• We could not confirm Thomson's rules on RVs, tiny homes, minimum home size or lot size; those sit in the city zoning ordinance, so ask Community Development at 706-595-1781 before buying²⁸.
• The permit procedures handout posted on the city site is old, so confirm current requirements and fees with the permit office before relying on it¹¹.
• A lot on city sewer does not need septic approval, but where sewer is not available the health department letter is required before the building permit¹⁵.

Sources

1. Building Permits (Thomson), quoted and re-checked
2. Community Development (City of Thomson / McDuffie County) (Thomson), quoted and re-checked
3. McDuffie County Planning Commission Building Permit Procedures (Thomson), quoted and re-checked
4. Adopted Codes (Thomson), quoted and re-checked
5. McDuffie County Planning Commission Building Permit Procedures (Thomson), quoted and re-checked
6. Residential and Commercial General Contractors Frequently Asked Questions (Georgia statewide rule), quoted and re-checked
7. thomson-mcduffie.gov (Thomson), quoted and re-checked
8. McDuffie County & City of Thomson Community Development / Planning Commission (thomson-mcduffie.gov)
9. Building Inspections (Thomson), quoted and re-checked
10. Building Inspections (Thomson), quoted and re-checked
11. McDuffie County Planning Commission Building Permit Procedures (Thomson), quoted and re-checked
12. Building Permits (Thomson), quoted and re-checked
13. Community Development (City of Thomson / McDuffie County) (Thomson), quoted and re-checked
14. Georgia Tiny House Fact Sheet (Georgia statewide rule), quoted and re-checked
15. McDuffie County Planning Commission Building Permit Procedures (Thomson), quoted and re-checked
16. GA DPH Onsite Sewage Manual (Georgia statewide rule), quoted and re-checked
17. McDuffie County Health Department / Environmental Health (ada.ecphd.com)
18. Share of soils USDA rates "not limited" for a conventional septic drain field (SSURGO). A strict rating: the median county is about 6% and a tenth of counties are 0%, so a low figure means most lots need a site evaluation or an engineered system, not that septic is impossible. Cite it only with that caveat: Bolthole Index county data
19. Community Development (City of Thomson / McDuffie County) (Thomson), quoted and re-checked
20. Effective property tax rate: Bolthole Index county data

Written October 16, 2026 from the rules quoted below, each taken from an official source and re-checked by an independent reviewer. This is research, not legal advice: rules change, so confirm with the office before you buy or build.