Unincorporated Henry County, Georgia requires a building permit for a new single-family home and applicable residential additions or accessory structures1. The county also applies zoning in unincorporated areas2. District 4 Environmental Health handles local septic permits and inspections under Georgia's statewide rules3. An owner may act as general contractor for a personal residence by submitting the required affidavit and identification4.
At a glance
- Building permit
- Required for residential construction in unincorporated Henry County1
- Zoning
- Applies in unincorporated Henry County under the Unified Land Development Code2
- Septic permit
- Required for septic service; District 4 Environmental Health administers permits and inspections35
- Owner-builder
- Available for a personal residence with an affidavit, identification and occupancy restrictions4
- 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 October 10, 2026.
Off-grid gear
Going off-grid in Henry County means bringing your own water and power. The kit we’d start with:
- Water Crystal Quest Filter any source — well, rain, or creek — to drinking-clean.
- Power Bluetti Solar generators and home battery backup for living off the grid.
- Septic Soil percolation test kit Run your own perc test before paying an engineer — the first thing a septic office asks about.
- Water Well water test kit Bacteria, nitrates, hardness — know what the well on a parcel is really pumping.
These are affiliate links — we may earn a commission, at no cost to you. As an Amazon Associate, Bolthole Index earns from qualifying purchases.
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 whether or not they are locally enforced9. For each permitted single-family dwelling or townhouse, the county's $7,085.90 development impact fee is due before permit issuance as of July 1, 2026; this amount is not the complete building-permit fee schedule610. Henry County allows an owner-builder to pull a permit for a personal residence by submitting the Homeowner/Builder Affidavit and identification, but the owner must intend to occupy the home and may not build it to sell, rent or house another person or family4. The owner-builder remains responsible for code compliance and cannot build another residence under that option for 2 years after receiving the certificate of occupancy4.
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) 288-605111. Residential applications and supporting paperwork go through SAGESGov, where the applicant must choose the correct project type and complete the applicable checklist sections12. Building permits, land-disturbance permits and lot-modification applications may remain separate application records, and each process must be filed under the proper record unless staff directs otherwise13. Incomplete or inaccurate submissions can lead to intake denial, correction requests and delays12.
Does Henry County have zoning?
Yes. Henry County uses a Unified Land Development Code and Highway Corridor Overlay District for zoning in 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 ordinance14. A city may administer different rules inside its limits, so ask the city with jurisdiction there2. For unincorporated land, Henry County separately reviews lot divisions and modifications when applicable, including minimum lot size, lot width, zoning conditions, variances and legal access15. One district-specific exception: inside the Towaliga Watershed Protection District, a single-family lot needs at least 1 1/4 acres unless public sewerage serves it16. Parcels in that district that are adjacent to or within 1,000 feet of a reservoir owned or operated by Henry County or the Henry County Water and Sewerage Authority need at least 3 acres, with buildings and septic field lines set back 250 feet1718. Outside that watershed district, we could not confirm numeric minimum lot size, setbacks, lot coverage, building height or minimum dwelling size; ask the Building & Plan Review Department for the standards tied to the parcel's district11.
How do septic permits work in Henry County?
District 4 Environmental Health administers Henry County septic permits, inspections and complaints under Georgia Department of Public Health rules3. District 4 publishes separate applications for new residential systems, residential repairs, new commercial systems and commercial repairs19. Apply before developing a lot or structure that will use septic; the site must receive a favorable inspection before the construction permit is issued20. The permit remains valid for no more than 12 months20. Final inspection is required after construction and before final cover, and the County Board of Health must give written approval before the system is backfilled or used2122. Residential additions such as pools, detached garages and outbuildings on septic property also require contact with the local Environmental Health Office, an application and associated fees19. About 72% of Henry County soils have no severe limitation for a conventional drain field, but the specific site still must pass review23.
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 apply11. 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 answer11.
Building a home in Henry County: the steps, in order
- Confirm the parcel's zoning district and whether county or city rules apply before design214.
- Decide how water and wastewater will be served. Provide a public-water meter receipt or obtain District 4's location permit for a non-public well, and obtain a septic permit when the property will use septic rather than sewer2425.
- Apply to District 4 Environmental Health for septic site review and a construction permit before site development; the permit lasts no more than 12 months320.
- Submit the Homeowner/Builder Affidavit and identification if you will act as your own builder, and make sure the occupancy restrictions fit your plan4.
- Submit each applicable record through SAGESGov; building, land-disturbance and lot-modification applications may be separate13.
- Obtain the land-disturbance permit first when disturbing 200 square feet or more, then obtain the building permit1.
- Before final cover or use of the septic system, obtain the required final inspection and written approval2122.
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 use214. 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 approval2320. Verify whether the property has public water and sewer. A county residential submission needs a water-meter receipt for public water or a well permit for a well, while septic documentation is required for septic service but not sewer service24. District 4 issues location permits for non-public wells, and private-well applicants must use a licensed water-well contractor25. If access touches a state highway right-of-way, obtain the required state permit before construction there26. Also ask the county about parcel-specific floodplain approval and county driveway rules, which we could not confirm.
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 one11.
- Georgia's tiny-house Appendix Q provisions apply only if Henry County adopted them locally; confirm adoption with the Building & Plan Review Department711.
- The published $7,085.90 amount is a development impact fee effective July 1, 2026, not a complete building-permit fee schedule; confirm all current charges before budgeting106.
Sources
- Residential New Home Permit Checklist, quoted and re-checked
- Planning & Zoning, quoted and re-checked
- Wastewater Management, quoted and re-checked
- Residential New Home Permit Checklist, quoted and re-checked
- Residential New Home Permit Checklist, quoted and re-checked
- Building & Plan Review Department, quoted and re-checked
- 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
- Building & Plan Review Department, quoted and re-checked
- Henry County Building & Plan Review Department (henrycountyga.gov)
- Building & Plan Review Department, quoted and re-checked
- Residential New Home Permit Checklist, quoted and re-checked
- Governing Statutes, Regulations, and Guidance (Georgia statewide rule), quoted and re-checked
- henrycountyga.gov, quoted and re-checked
- Henry County Code of Ordinances, Sec. 3-5-383. Restricted use of certain land, quoted and re-checked
- Henry County Code of Ordinances, Sec. 3-5-383. Restricted use of certain land, quoted and re-checked
- Henry County Code of Ordinances, Sec. 3-5-383. Restricted use of certain land, quoted and re-checked
- Wastewater Management, quoted and re-checked
- On-Site Sewage Management Systems Manual, quoted and re-checked
- Residential Repair Permit Application, quoted and re-checked
- On-Site Sewage Management Systems Manual, quoted and re-checked
- 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
- Residential New Home Permit Checklist, quoted and re-checked
- Well Water, quoted and re-checked
- Regulations for Driveway & Encroachment Control Manual (Georgia statewide rule), quoted and re-checked
Written October 10, 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.