Unincorporated Henry County, Georgia requires a building permit for a new single-family home and certain residential additions or accessory structures1. The county also applies zoning through its Unified Land Development Code in unincorporated areas2. District 4 Public Health handles septic permits and inspections3. An owner may pull the county permit using a Homeowner/Builder Affidavit4.
At a glance
- Building permit
- Required for residential construction in unincorporated Henry County5
- Zoning
- Applies in unincorporated Henry County under the Unified Land Development Code2
- Septic permit
- Required and handled by District 4 Public Health3
- Owner-builder
- Allowed via Homeowner/Builder Affidavit; no contractor license required4
- Development impact fee
- $7,085.90 per home, effective July 1, 20266
- Tiny home
- Treated as a standard dwelling, subject to the full building code and local zoning7
- Well
- A well permit is required when a well will serve the property8
Who to call
Building permits
Henry County Building & Plan Review Department
Reviews plans, issues residential building permits, and coordinates the combined Building & Plan Review / Planning & Zoning compliance checklist for unincorporated Henry County
140 Henry Parkway, McDonough, GA 30253
Septic permits
District 4 Public Health - Environmental Health (Henry County)
Administers septic (onsite sewage management system) permits and inspections for Henry County under Georgia DPH Rule 511-3-1
Contact details are copied from each office’s official page and were checked against it on September 29, 2026.
Do you need a building permit in Henry County, Georgia?
Yes. Unincorporated Henry County requires a building permit for a new single-family detached home and for applicable residential additions or accessory structures1. A residential land-disturbance permit is also required before the building permit when the project will disturb 200 square feet or more1. Georgia's mandatory construction codes apply statewide, and local governments use administrative procedures to enforce them9. If you're building a new single-family home, budget for the county's development impact fee: as of July 1, 2026, the fee totals $7,085.90 and is due before the building permit is issued6. Henry County lets an owner-builder pull the permit by signing a Homeowner/Builder Affidavit4. The owner-builder option does not waive permits, codes, inspections or zoning requirements10.
Who is the Henry County building department, and how do you reach them?
Henry County's Building & Plan Review Department is at 140 Henry Parkway, McDonough, Georgia 30253, phone (770) 288-60516. Residential applications and supporting paperwork go through SAGESGov, and the applicant must select the project type and complete the applicable checklist sections11. Building permits, land-disturbance permits and lot-modification applications may still be processed as separate application records11. The checklist does not replace county codes, approved zoning conditions, construction codes or other applicable requirements11.
Does Henry County have zoning?
Yes. Henry County's Unified Land Development Code establishes zoning districts for unincorporated Henry County2. Georgia does not impose one statewide district map, so the parcel's district, permitted uses and development standards must come from the applicable county or municipal ordinance12. We could not confirm one rule covering every incorporated municipality in Henry County; ask the city with jurisdiction when a parcel is inside city limits. For unincorporated land, confirm the zoning district and any parcel-specific conditions with Henry County before fixing the house location or buying for a particular use2. Numeric minimum lot size, setbacks, lot coverage, building height and minimum dwelling size could not be confirmed from the available county material, so ask the Building & Plan Review Department for the standards tied to the parcel's district6.
How do septic permits work in Henry County?
District 4 Public Health's Henry County Environmental Health Office administers permits and inspections for onsite sewage systems3. Apply in writing before developing a lot or structure that will use septic, and before installing the system or any component3. The County Board of Health must approve or deny a completed application within 20 days, and a construction permit remains valid for no more than 12 months3. A favorable site inspection is required before permit issuance13. Do not backfill or use the system until the County Board of Health completes its final inspection and gives written approval; repairs, replacements and additions also require permits and inspections143. About 72% of Henry County soils have no severe limitation for a conventional drain field, but the specific site still must pass review15.
Can you live in an RV or tiny home on your land in Henry County?
A site-built or modular tiny home in Georgia is a dwelling subject to the applicable building codes and local siting and zoning requirements7. Georgia's IRC Appendix Q tiny-house provisions apply only when the local government has specifically adopted them, and we could not confirm Henry County's adoption or its local tiny-home occupancy rule7. Ask the Building & Plan Review Department whether the parcel's zoning district allows the proposed home and which code provisions apply6. We also could not confirm Henry County's rule for long-term RV occupancy or temporary camping on private land. Ask the department about both the intended duration and whether utility connections or an active building permit change the answer6.
Building a home in Henry County: the steps, in order
- Confirm the parcel's zoning district and applicable county or city requirements before design212.
- Decide how water and wastewater will be served. Provide a public-water meter receipt or a well permit, and obtain a septic permit when the property will use septic rather than sewer168.
- Apply to District 4 Public Health for the septic site review and construction permit before site development; the permit lasts no more than 12 months3.
- Complete the Homeowner/Builder Affidavit if you will act as your own builder4.
- Submit the applicable paperwork through SAGESGov; building, land-disturbance and lot-modification applications may be separate records11.
- Obtain the land-disturbance permit first when disturbing 200 square feet or more, then obtain the building permit1.
- Before backfilling or using septic, obtain the County Board of Health's final inspection and written approval14.
What to check before you buy land in Henry County
Confirm whether the parcel is in unincorporated Henry County or a city, then identify the zoning district and permitted use212. Check septic feasibility before committing: about 72% of county soils have no severe limitation for a conventional drain field, but the individual site still needs approval153. Verify whether the property has public water and sewer. A home served by public water needs water-meter documentation, while a well-served property needs a well permit; septic documentation is required for septic service but not for sewer service168. If access touches a state highway right-of-way, obtain the required state permit before construction there17. Also check floodplain status and legal access; the available material did not confirm Henry County's parcel-specific floodplain approval or county driveway rules.
Watch-outs
- We could not confirm RV or camper occupancy rules for unincorporated Henry County; ask the Building & Plan Review Department before planning to live in one6.
- Georgia's tiny-house Appendix Q provisions apply only if Henry County adopted them locally; confirm adoption with the Building & Plan Review Department76.
- Henry County's development impact fee changes by date; it is scheduled to be restored to $7,085.90 effective July 1, 2026, so confirm the current amount before you budget your build6.
Sources
- Residential New Home Permit Checklist, quoted and re-checked
- Henry County Unified Land Development Code, Chapter 2 (Zoning Districts) (2026 county census)
- Wastewater Management, quoted and re-checked
- Henry County Building & Plan Review Department (2026 county census)
- Residential New Home Permit Checklist (2026 county census)
- Henry County Building & Plan Review Department (henrycountyga.gov)
- Georgia Tiny House Fact Sheet (Georgia statewide rule), quoted and re-checked
- Residential New Home Permit Checklist, quoted and re-checked
- Mandatory and Permissive State Codes, quoted and re-checked
- Residential and Commercial General Contractors Frequently Asked Questions (Georgia statewide rule), quoted and re-checked
- Building & Plan Review Department, quoted and re-checked
- Governing Statutes, Regulations, and Guidance (Georgia statewide rule), quoted and re-checked
- Rules of the Department of Public Health, Chapter 511-3-1, On-Site Sewage Management Systems, quoted and re-checked
- Manual for On-Site Sewage Management Systems, quoted and re-checked
- Share of soils without severe limits for a conventional septic drain field (USDA SSURGO): Bolthole Index county data
- Residential New Home Permit Checklist, quoted and re-checked
- Regulations for Driveway & Encroachment Control Manual (Georgia statewide rule), quoted and re-checked
Written September 29, 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.