ADUs and Passive Income: Navigating Henry County’s Zoning Laws for Accessory Dwelling Units

For many Henry County homeowners, the backyard may represent more than extra outdoor space—it may represent flexibility, family support, or future income potential.

Accessory dwelling units, commonly called ADUs, are attracting attention from homeowners interested in building detached guest cottages, garage apartments, tiny-home-style residences, or independent living spaces on an existing property.

The appeal is easy to understand.

A thoughtfully planned ADU may create space for aging parents, adult children, long-term guests, a private home office, or—in situations where local regulations allow it—a rental opportunity.

But owning a large lot does not automatically mean you can build a second residence or rent it independently.

Before creating floor plans or estimating monthly income, homeowners must understand the property's zoning, development standards, building requirements, utility capacity, neighborhood restrictions, and permitted use.

Henry County adopted a Unified Land Development Code in 2026, and the county identifies accessory structure and dwelling standards within its land-development framework. Because regulations can change and every property is different, homeowners should verify current requirements directly with Henry County Planning & Zoning before purchasing plans, hiring a contractor, or advertising future rental income.

What Is an Accessory Dwelling Unit?

An accessory dwelling unit is generally a secondary living space located on the same property as a primary residence.

Depending on the property design and local approval, an ADU may take the form of:

• A detached backyard cottage
• A garage apartment
• A converted accessory structure
• An attached private suite
• A finished living area with an independent entrance
• A small secondary residence

An ADU is different from a shed, workshop, or standard detached garage because it is intended to provide residential living space.

Features may include:

• A bedroom or sleeping area
• A bathroom
• A kitchen or food-preparation area
• Living space
• Separate access

The presence of a kitchen, independent utilities, or a separate entrance may affect how local officials classify the space. That is why homeowners should obtain a property-specific determination before beginning construction.

Step 1: Confirm That the Property Is in Unincorporated Henry County

Before researching ADU requirements, determine which local government has zoning authority over the property.

A Henry County mailing address does not necessarily mean the property is governed by unincorporated Henry County regulations.

Properties located inside cities such as:

• McDonough
• Stockbridge
• Hampton
• Locust Grove

may be subject to separate municipal zoning and development rules.

The city listed in a mailing address is not always enough to determine jurisdiction. Verify whether the property is inside city limits or located in unincorporated Henry County.

This distinction matters because the zoning process, permit requirements, setbacks, and allowed uses may differ.

Step 2: Verify the Property’s Zoning Classification

The next step is identifying the property's zoning district.

Your zoning classification may influence:

• Whether an accessory dwelling is allowed
• Whether additional approval is required
• Minimum lot requirements
• Building setbacks
• Maximum size or building coverage
• Building height
• Parking requirements
• Placement of accessory structures

Do not assume that a neighboring property with a guest house means your property automatically qualifies.

That structure may have been approved under different rules, built before current regulations, or permitted under a different zoning classification.

Start with the property's parcel information and request confirmation from Henry County Planning & Zoning.

Step 3: Determine Whether Your ADU Concept Is Allowed

The term “ADU” can describe several different designs, but local rules may treat those designs differently.

For example, these projects may not follow identical approval paths:

• A detached tiny-home-style dwelling
• An apartment above an existing garage
• A new detached garage with living space
• An attached in-law suite
• A converted basement with a separate entrance
• A backyard guest cottage

Prepare a basic description before contacting the county.

Include:

• The property address
• Parcel identification information
• Current zoning classification
• Approximate lot size
• Proposed location
• Estimated building size
• Whether the unit will be attached or detached
• Whether it will include a kitchen
• Whether it will have a separate entrance
• Whether it is intended for family occupancy or rental use

The more specific the concept, the more useful the initial zoning guidance may be.

Step 4: Review Setbacks and Lot Placement

Even when an accessory dwelling may be allowed, the property must still be capable of accommodating it.

A large backyard does not always equal a buildable backyard.

Potential constraints may include:

• Rear-yard setbacks
• Side-yard setbacks
• Easements
• Drainage areas
• Flood zones
• Septic locations
• Utility lines
• Building separation requirements
• Maximum lot coverage
• Required parking

A survey can help identify boundaries and existing site conditions, but homeowners may also need professional site planning before determining whether the project is feasible.

Avoid purchasing prefabricated structures or construction plans before confirming that the proposed location meets applicable requirements.

Step 5: Evaluate Water, Sewer, and Septic Capacity

Utilities can be one of the most important—and expensive—parts of an ADU project.

Homeowners should determine whether the property uses:

• Public water
• Public sewer
• A private well
• A septic system

Adding another living space may affect water demand, wastewater capacity, utility connections, and permitting requirements.

For properties using septic systems, the existing system may not automatically support additional bedrooms or occupancy.

Questions to ask include:

• Can the ADU connect to the existing system?
• Is additional septic capacity required?
• Will a separate utility connection be necessary?
• Are impact fees or connection fees involved?
• Is there adequate space for required infrastructure?

Complete this review early. Utility limitations can significantly change the project's design and budget.

Step 6: Understand the Difference Between an ADU and a Tiny Home

Tiny homes are popular, but “tiny home” is often a marketing or design term—not a zoning approval category.

A small structure may still need to comply with:

• Zoning regulations
• Building codes
• Foundation requirements
• Electrical codes
• Plumbing codes
• Mechanical requirements
• Utility standards
• Residential occupancy rules

A tiny home on wheels may also be treated differently from a permanent dwelling.

Do not assume that a movable structure, recreational vehicle, or prefabricated building can automatically be used as a permanent residence. Henry County’s code recognizes legally permitted accessory dwelling units while restricting additional occupancy through recreational vehicles, tents, or unapproved accessory structures.

The safest approach is to describe the exact structure and intended use to the appropriate county department.

Step 7: Confirm Whether Rental Use Is Permitted

Building approval and rental approval are not necessarily the same thing.

A structure may be approved for family occupancy or accessory residential use without automatically qualifying for every type of rental activity.

Before estimating income, ask:

• Is long-term rental occupancy permitted?
• Are owner-occupancy requirements involved?
• Are short-term rentals treated differently?
• Is a business license required?
• Are additional inspections necessary?
• Are parking requirements affected?
• Are there occupancy restrictions?

Never market an ADU as guaranteed rental income until the permitted use has been verified.

Potential income should be evaluated conservatively and should account for vacancies, maintenance, insurance, utilities, taxes, management, repairs, and financing costs.

Step 8: Review HOA Rules and Private Restrictions

County approval is only one layer of the process.

If the property is located within a homeowners association, review:

• HOA declarations
• Architectural guidelines
• Community covenants
• Rental restrictions
• Exterior design standards

An HOA may restrict detached structures, secondary residences, garage conversions, exterior entrances, or rental activity.

Private covenants may be more restrictive than local zoning requirements.

Before investing in architectural plans, obtain written guidance from the association when applicable.

Step 9: Build a Realistic ADU Budget

An ADU involves more than construction costs.

A complete feasibility budget may include:

• Surveying
• Architectural plans
• Engineering
• Site preparation
• Permit fees
• Utility connections
• Septic modifications
• Foundation work
• Construction
• Landscaping
• Driveway or parking improvements
• Insurance adjustments
• Furnishings
• Contingency reserves

Then compare the estimated total investment with the expected benefit.

That benefit may include:

• Potential rental income, if legally permitted
• Reduced costs for multigenerational living
• Avoided outside office expenses
• Greater household flexibility
• Long-term property utility

An ADU can be valuable even when rental income is not the primary goal.

The Passive-Income Opportunity

When legally permitted and financially feasible, an ADU may provide homeowners with an additional housing option that supports long-term financial flexibility.

Potential uses may include:

Long-Term Rental Housing

A separate unit may create rental-income potential when local rules and property restrictions allow it.

Multigenerational Living

Parents, grandparents, or adult children may live nearby while maintaining privacy.

Executive Home Office

A detached workspace may support remote professionals or business owners without disrupting the primary residence.

Guest Accommodations

Extended family and long-term visitors can enjoy greater independence.

The strongest ADU strategies begin with flexibility—not an assumption that income is guaranteed.

Questions to Ask Henry County Before Moving Forward

Use this checklist when speaking with Planning & Zoning or other county departments:

1. What is the property's zoning classification?
2. Is an accessory dwelling allowed in this zoning district?
3. Is the proposed design considered an ADU, guest house, accessory structure, or another use?
4. Is administrative approval sufficient, or is another zoning process required?
5. What size, height, setback, and lot-coverage standards apply?
6. Are separate entrances and kitchens permitted?
7. What parking requirements apply?
8. Can the unit be used as a long-term rental?
9. Are owner-occupancy requirements involved?
10. What building, utility, septic, or development permits are required?

Henry County’s Planning & Zoning resources are the appropriate starting point for current, property-specific guidance. Henry County Planning & Zoning

Final Thoughts

Accessory dwelling units are changing the way homeowners think about property value.

A backyard cottage, garage apartment, or independent living suite may create opportunities for family support, flexible work, long-term adaptability, or rental income where permitted.

But the smartest ADU investment begins before construction.

It begins with zoning verification.

Before buying plans, ordering a tiny home, or estimating future cash flow, confirm the property's jurisdiction, zoning classification, development standards, utility capacity, permit requirements, HOA restrictions, and legal occupancy options.

The goal is not simply to add another building.

The goal is to create a compliant, functional asset that supports your household and strengthens the property's long-term value.

Call to Action

Considering a Henry County property with ADU, guest-suite, garage-apartment, or multigenerational potential?

I can help you identify homes with the space and layout flexibility to support your goals. Before making an offer or beginning construction, we can also connect you with the appropriate zoning, lending, legal, and construction professionals to evaluate the opportunity.

FAQs

Are ADUs allowed in unincorporated Henry County?

Accessory dwelling standards are addressed within Henry County’s land-development framework, but approval depends on the property's zoning, site conditions, design, and intended use. Verify current requirements directly with Henry County before moving forward.

Can I place a tiny home in my backyard?

Not automatically. The county may evaluate the structure based on its construction, foundation, utilities, occupancy, location, and intended use. A tiny home must still comply with applicable zoning and building requirements.

Can I rent an ADU for passive income?

Rental eligibility should be confirmed separately. Zoning approval for an accessory dwelling does not automatically guarantee that every rental use is permitted.

Can I build an apartment above my garage?

Possibly, depending on zoning, setbacks, building standards, utilities, parking, and other requirements. Request a property-specific review before designing the project.

Does HOA approval replace county approval?

No. HOA approval and government approval are separate. A project may need to satisfy both.

Will an ADU increase my property value?

An approved, well-designed ADU may increase a property's functionality and buyer appeal, but value depends on construction quality, permitted use, market demand, and comparable sales.