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ADU Construction · Henry County, Georgia
Permit required
In Georgia, a ADU Construction requires a building permit.
An accessory dwelling unit (ADU) always requires a building permit because it adds a habitable dwelling, including electrical, plumbing, mechanical permits and egress/zoning review. Plans are reviewed under the Statewide code (IRC 2024); apply through Henry County Building & Plan Review before work begins.
Source: Statewide, IRC 2024 · Verified 2026 by StateDataIndex
Building an Accessory Dwelling Unit requires complex zoning, structural, and utility permits.
With a growing population of around 249,960 residents, Henry County maintains a relatively streamlined permitting process compared to major urban hubs. Processing typically takes 1 to 3 weeks.
Code Compliance & Inspections
Because Georgia sits in a hurricane-prone zone, the Georgia State Minimum Standard Codes requires exterior work to use wind-rated materials and proper anchoring (such as tie-downs and impact-rated components) to pass inspection.
Concurrent Permits & HOAs
For Henry County residents, we highly recommend reviewing your neighborhood HOA covenants before paying any municipal fees. Often, homeowners associations maintain stricter rules regarding materials and dimensions for your ADU Construction than the county itself.
Zoning & Cost Factors
Georgia mandates adherence to state minimum standard codes, but allows local governments significant flexibility in enforcing aesthetic and density zoning ordinances. Fortunately, Georgia maintains relatively builder-friendly regulations, keeping base permit fees competitive.
Estimated municipal base fee: $383–$585
This is a planning estimate only — actual fees in Henry County depend on your project valuation. A typical breakdown looks roughly like:
- Application Fee: ~$135
- Plan Review Fee: ~$90
- Inspection Fee: ~$225
Always confirm exact fees with your local building department before applying.
Cost Comparison: Henry County vs State Average
State Average Base Fee
Henry County Estimated Base Fee
*Chart represents median application base fees and does not include project valuation percentages.
Henry County Building Department
Office: Henry County Building & Plan Review
Address: 140 Henry Pkwy, McDonough, GA 30253, USA
Phone: (770) 288-6051
Source: official Henry County government records. Hours and procedures can change — call ahead to confirm.
How to Apply in Henry County
In Henry County, applications and fees are usually handled through an online permit portal. Your contractor should include their Georgia State Licensing Board license number to avoid rejections.
ADU Construction Requirements in Henry County
Typical Submittal Package
When applying for a ADU Construction permit, you or your contractor will generally need to submit the following documentation for the city's review:
- Comprehensive architectural and structural plans
- Foundation engineering reports
- Sewer, water, and utility connection plans
- Site plan showing property lines and setbacks
Standard Ordinances & Processing Time
Key code points for a ADU Construction in Henry County: ADUs typically have maximum square footage limits (often 800-1200 sq ft), height restrictions, and usually require dedicated off-street parking depending on local zoning.
Estimated processing time in Henry County: 10 to 14 business days.
Frequently Asked Questions
What are the specific penalties for unpermitted ADU Construction work in urban Henry County?
Building without authorization is considered a code violation. The local government can issue a Stop Work Order, forcing you to halt construction immediately. You may be subject to retroactive permit fees (often double the original cost), daily fines, or even a mandate to tear down the unpermitted work at your own expense.
Can a homeowner pull their own ADU Construction permit in Georgia?
Yes. Georgia generally allows property owners to act as their own general contractor under an Owner-Builder exemption. If you take this route, you assume full legal and financial liability and must ensure all work complies with the Georgia State Minimum Standard Codes.
How much does a ADU Construction permit cost in Henry County?
As a planning estimate, base municipal fees for a ADU Construction permit in Henry County typically fall between $383 and $585. The final amount depends on your project valuation, so confirm the exact figure with the local building department.
How long does it take to get a ADU Construction permit in Henry County?
Based on the size of Henry County, the typical processing time is 10 to 14 business days. Times vary with the season and the building department application volume.
Where do I apply for a ADU Construction permit in Henry County?
You can apply through the Henry County Building & Plan Review or online via the county permit portal. For questions, call (770) 288-6051.
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Expert ADU Construction Resources
Legal & Compliance
Understanding Zoning Laws: What You Can and Cannot Build
Demystify local zoning ordinances, setbacks, and land-use rules to ensure your project is legal.
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Legal & Compliance
HOA Approvals vs. City Permits: Which Comes First?
Understand the difference between municipal building permits and Homeowners Association approvals.
Read GuideBuilding It Yourself? Here's What You'll Need
Planning an ADU? Tools homeowners use in the design and layout phase:
📘
Backyard ADU Design Guide (Book)
View on Amazon →
📐
Laser Level
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🔍
Franklin ProSensor Stud Finder
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📏
25ft Tape Measure
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Other Permit Types in Henry County
Planning another home improvement project? Check the requirements and fees for:
Nearby Jurisdictions in Georgia
Building near the county line? Check requirements for neighboring areas: