“Can I build an ADU on my property?”
It is one of the first—and most important—questions we hear from Virginia homeowners interested in accessory dwelling units.
In many cases, the answer is yes.
But determining whether you can build an ADU involves more than checking the size of your backyard. Zoning, setbacks, utilities, septic capacity, easements, parking, lot coverage, and other site conditions can all affect what you are allowed to build and where you can place it.
Two properties located only a few miles apart may require completely different approaches.
One may have public water and sewer, while the other relies on a private well and septic system. One may have a large, open backyard, while another requires a smaller design or more creative placement.
None of those conditions automatically makes or breaks an ADU project.
The goal is to understand the property, identify potential obstacles early, and determine the best path forward.
At 757 Building Company, we evaluate properties throughout Hampton Roads and the surrounding areas to help homeowners answer a more useful question:
What type of ADU can work on this property, and what will it take to build it?
What Is an Accessory Dwelling Unit?
An accessory dwelling unit, commonly called an ADU, is an independent living space located on the same property as a primary residence.
An ADU generally includes its own:
- Living area
- Sleeping area
- Kitchen
- Bathroom
- Entrance
ADUs can take several forms, including:
- Detached backyard cottages
- Attached additions
- Garage apartments
- Apartments above detached garages
- Converted areas within an existing home
- Small studio-style residences
At 757 Building Company, we focus primarily on purpose-built ADUs designed to function and feel like complete homes.
An ADU can provide a private residence for aging parents, an independent space for an adult child, housing for extended family, or a long-term rental that generates additional income.
Whatever the intended use, every successful ADU project begins with understanding what the property can support.
Start With Zoning
Every property has a zoning classification that helps determine what can be built on it.
Historically, Virginia cities and counties have had significant control over their own ADU regulations. As a result, the rules can vary considerably from one locality to another.
Depending on the property’s location, local regulations may address:
- Whether detached or attached ADUs are permitted
- Maximum ADU size
- Building height
- Setbacks from property lines
- Parking requirements
- Owner-occupancy requirements
- Rental restrictions
- Lot coverage
- Permitting or approval procedures
That is why we are cautious about giving homeowners a blanket answer based only on the city or county in which they live.
The property’s actual zoning, lot configuration, utility conditions, and applicable local requirements all need to be considered.
Virginia Is Becoming More ADU-Friendly
Virginia is moving toward a more standardized framework for accessory dwelling units.
The Commonwealth enacted legislation in 2026 establishing new ADU standards scheduled to take effect on July 1, 2027. Under the new statute, zoning ordinances in applicable single-family residential districts will generally be deemed to allow ADUs as a permitted accessory use.
Localities may still enforce certain requirements related to building codes, water, sewer, septic systems, parking, stormwater, flood zones, historic districts, lot coverage, and other site considerations. The law also contains exceptions, including one affecting localities that adopted an ADU ordinance before January 1, 2026.
In other words, the legislation is a significant step toward making ADUs more accessible, but it does not eliminate the need to evaluate the rules that apply to a particular property.
Until the new standards take effect—and even after they do—the feasibility process should begin with the property and its locality.
The details of Virginia’s new ADU framework are available in Virginia Code § 15.2-2292.4.
Is My Property Large Enough for an ADU?
Homeowners often assume they need several acres to build an ADU.
A larger property can certainly provide more options, but total acreage is not the only consideration. What matters most is whether the property contains a workable building envelope.
The building envelope is the portion of the property where an ADU can be legally and practically constructed after accounting for:
- Property lines
- Required setbacks
- Existing buildings
- Easements
- Wells and septic systems
- Drainfields and reserve areas
- Public or private utilities
- Drainage and stormwater conditions
- Wetlands, flood zones, or other environmental features
- Driveways and emergency access
- Lot-coverage limitations
Sometimes the most obvious location is not the best one.
Moving the ADU 20 or 30 feet, rotating the building, choosing a smaller model, or changing the driveway layout can completely alter what is possible.
A survey, GIS records, property information, and a preliminary site layout can usually tell us a great deal. If the homeowner’s preferred location preferred location does not work, that does not necessarily mean the ADU cannot be built.
It may simply mean the site needs a different plan.
How Do Setbacks Affect ADU Placement?
Setbacks establish minimum distances between a building and features such as:
- Property lines
- Roads or rights-of-way
- Other structures
- Wells
- Septic tanks and drainfields
- Wetlands or environmental areas
One way to visualize setbacks is to imagine a smaller box inside your property boundaries. The ADU generally needs to fit within that box while also avoiding easements, utility areas, septic components, and other restrictions.
On some properties, the available building area is immediately apparent. On others, finding it requires more careful planning.
A narrow lot, unusual property shape, existing detached garage, or septic reserve area may limit certain locations without eliminating the project entirely.
The objective is to find the safest, most practical, and most cost-effective place for the ADU.
Can I Build an ADU if I Have a Well and Septic System?
Possibly—and having a private well and septic system does not automatically prevent you from building an ADU.
Many properties throughout Hampton Roads and the surrounding rural areas are not connected to public utilities. These properties simply require additional evaluation to determine how the ADU will receive water and handle wastewater.
Septic Capacity
Septic systems are generally approved based in part on the number of bedrooms they are designed to serve.
For example, if a property has a three-bedroom primary residence and the homeowner wants to build a two-bedroom ADU, the wastewater plan must account for the additional bedrooms.
Depending on the property, possible solutions may include:
- Expanding the existing septic system
- Modifying or upgrading the existing system
- Adding drainfield capacity
- Installing a separate septic system for the ADU
- Using an engineered septic solution
The appropriate option depends on several factors, including:
- Soil conditions
- Existing septic capacity
- Available land
- Drainfield and reserve-area locations
- The number of proposed ADU bedrooms
- Local health department requirements
This is one area where additional acreage can be especially helpful. Larger properties may provide more flexibility for locating the ADU, septic components, and required reserve areas.
However, acreage alone does not guarantee septic approval. The property still needs to be evaluated by the appropriate professionals and authorities.
Private Wells
The same general principle applies to a private well.
The planning process needs to determine whether the existing well can adequately serve both residences and whether the proposed design maintains the required separation between the well, septic components, buildings, and other site features.
Depending on the project, the existing well may be able to serve both homes, or another water-supply solution may be necessary.
The important point is that having a private well does not automatically disqualify the property. It simply makes water supply part of the feasibility and site-development plan.
What if My Property Has Public Water and Sewer?
Public water and sewer can simplify part of the feasibility process because the project may not require a private well, drainfield, or septic expansion.
However, public utilities do not eliminate every site consideration. We may still need to evaluate:
- Connection locations
- Tap or connection requirements
- Available capacity
- Utility easements
- Connection and impact fees
- Building placement
- Zoning and setbacks
- Parking
- Lot coverage
- Site-development requirements
Properties with public utilities can be excellent candidates for ADUs, particularly when there is adequate backyard space or an existing structure that can be replaced or incorporated into the project.
Our region includes both suburban neighborhoods with public utilities and rural properties with wells and septic systems. A successful ADU program needs to account for both.
What Are Lot Coverage and Impervious-Area Limits?
On smaller properties, lot coverage and impervious-area limitations can affect ADU feasibility.
Local regulations may limit how much of the property can be covered by buildings or surfaces that prevent water from naturally soaking into the ground.
These surfaces may include:
- Houses and ADUs
- Garages
- Driveways
- Concrete walkways
- Patios
- Other hardscape improvements
Reaching a coverage limit does not always end the project. A smaller ADU, modified footprint, reduced patio area, or different parking layout may solve the issue.
In other cases, the property may have more available coverage than the homeowner realizes.
The answer comes from calculating the existing and proposed improvements—not from making assumptions based on the apparent size of the yard.
Will I Need Additional Parking?
Parking requirements vary by locality and property.
An ADU may require dedicated off-street parking, replacement of parking displaced by construction, or compliance with other driveway and access requirements.
Potential parking solutions include:
- Expanding the existing driveway
- Adding a parking pad
- Creating a parking area beside the ADU
- Incorporating a garage into the ADU design
For homeowners who need both living space and enclosed parking, a carriage-house-style ADU can be an attractive option because it combines a garage and separate residence within one structure.
Parking is usually easier and less expensive to address when it is incorporated into the site plan from the beginning.
Can I Rent My ADU?
A long-term rental is one of the primary reasons many homeowners consider building an ADU.
For the right property, an ADU can create an independent rental residence without requiring the homeowner to move from the primary house.
Potential rental income may help a homeowner:
- Offset a portion of the mortgage
- Pay down construction financing
- Create supplemental monthly income
- Build an additional source of retirement income
- Turn underused property into a productive asset
However, homeowners should evaluate the rental rules that apply in their locality.
A traditional long-term residential lease is different from operating a short-term rental through a platform such as Airbnb or Vrbo. Localities and homeowners associations may treat short-term rentals differently or prohibit them altogether.
If rental income is the primary reason for building the ADU, that should be discussed early. The intended use can influence the appropriate size, layout, parking plan, privacy considerations, and overall financial analysis.
Can My Parents Live in an ADU?
Absolutely. In fact, multigenerational living is one of the most compelling reasons to build an ADU.
Instead of moving an aging parent into a spare bedroom, an ADU may allow the family to provide a complete home only steps away.
Mom, Dad, or another family member can have:
- A private bedroom
- A full bathroom
- A kitchen
- A living area
- A separate entrance
- Greater independence
At the same time, family members remain close enough to provide help when it is needed.
An ADU can also adapt as the family’s needs change. A home built for a parent today could later accommodate a caregiver, visiting family member, adult child, or long-term tenant.
That flexibility is one of an ADU’s greatest benefits.
Is an ADU a Good Option for an Adult Child?
An ADU can provide an excellent middle ground for an adult child who needs independence but is not yet ready to purchase a home.
Instead of remaining in a childhood bedroom or paying rent to an unrelated landlord, a son or daughter can live in a legitimate, private residence while saving money and building a career.
Depending on how the family structures the arrangement, rent paid by the adult child may remain within the family and contribute toward the cost of the ADU.
This is why an ADU should not be viewed only as a construction project. It can become part of a broader family housing and financial strategy.
Can I Sell the ADU Separately?
Generally, homeowners should think of an ADU as part of the same real estate as the primary residence—not as a separate home that can be sold independently.
Virginia’s new statutory framework allows applicable localities to prohibit an ADU from being sold separately or subdivided from the primary dwelling.
For most homeowners, the objective is not to sell the ADU separately. It is to make the existing property more useful, flexible, and potentially more valuable.
Instead of owning one residence on the property, the homeowner may have a primary residence and a second complete living space on the same parcel.
Whether and how much an ADU adds to a property’s market value depends on the property, construction quality, local demand, legal use, and the availability of comparable sales. Homeowners should consult a qualified local real estate professional or appraiser before relying on a specific value increase.
Can an HOA Prevent Me From Building an ADU?
If the property is located within a homeowners association, its governing documents should be reviewed during the feasibility process.
Local zoning approval and private HOA approval are separate matters.
A city or county may permit an ADU while recorded covenants, architectural standards, or other private restrictions impose additional requirements. Virginia’s new statute does not generally override private agreements and recorded covenants governing the use of real property.
An HOA does not automatically make an ADU impossible, but its rules need to be investigated early—before the homeowner invests heavily in plans, engineering, or site work.
The Six Questions We Want Answered First
When a homeowner contacts 757 Building Company about an ADU, we begin by answering six fundamental questions:
- What does the property’s zoning allow?
- Where can the ADU legally and practically fit?
- What is the best water and wastewater solution?
- Are there easements, environmental conditions, HOA restrictions, or other site considerations we need to design around?
- Which ADU design best fits the property and the homeowner’s goals?
- What site work, approvals, and estimated investment will be required to move the project forward?
Once we understand those six things, the project becomes much clearer.
We can identify which ADU models may work, where the unit could be placed, what utility or septic improvements may be necessary, and which approvals should be addressed before construction begins.
What Information Should I Have Available?
You do not need to have everything figured out before starting the conversation.
However, the following information can help with an initial property evaluation:
- The property address
- A copy of the property survey, if available
- Information about the existing well or septic system
- HOA or architectural-review documents
- The approximate location where you would like to place the ADU
- The way you intend to use the ADU
- The number of bedrooms you would prefer
- Your anticipated budget or financing needs
Do not be concerned if you do not have a survey or know the details of your septic system. Missing information does not automatically prevent an initial review. It simply helps identify what may need to be gathered next.
What Happens During an ADU Feasibility Review?
Our job is not simply to sell you an ADU floor plan. It is to determine whether that plan can actually work on your property.
Depending on the project, the feasibility process may include reviewing:
- Zoning requirements
- Property records and GIS information
- Surveys and recorded easements
- Setback and lot-coverage requirements
- Well and septic conditions
- Public utility availability
- Driveway access and parking
- HOA or architectural restrictions
- Preliminary ADU placement
- Site-development considerations
Some properties are relatively straightforward. Others require additional coordination with local planning departments, health departments, surveyors, engineers, septic professionals, or utility providers.
Identifying those needs early can help homeowners make informed decisions and avoid expensive surprises later.
So, Can You Build an ADU on Your Virginia Property?
In many cases, yes.
A smaller lot, private septic system, existing well, unusual property shape, or less-than-obvious building location does not automatically make an ADU impossible. It means the property needs to be evaluated carefully.
The question is not simply:
“Are ADUs allowed in my city or county?”
The better question is:
“What type of ADU can work on my property, and what will it take to build it?”
That is the question 757 Building Company can help you answer.
Find Out Whether Your Property Is ADU-Ready
Every successful ADU begins with the property—not the floor plan.
Before selecting finishes or committing to a particular design, it is important to determine what your property can support, what approvals may be required, and which ADU best fits your goals.
Whether you are creating a home for aging parents, providing an independent space for an adult child, building a long-term rental, or simply making better use of your land, the first step is understanding what is possible.
Contact 757 Building Company to begin evaluating your Virginia property and discover which ADU options may work for you.
