What Is an Accessory Dwelling Unit (ADU) — and Should You Build One?

Granny flat. Casita. Carriage house. In-law apartment. These charming names all refer to one increasingly popular concept: the Accessory Dwelling Unit (ADU) — a small, independent living space built on the same lot as a primary residence.

As zoning laws evolve and multi-generational living grows in popularity, ADUs are gaining momentum across the U.S. Whether you're looking to house a family member or generate rental income, an ADU could be a smart investment. But before you start sketching floor plans, there are several important factors to consider.

First Things First: Is an ADU Allowed on Your Lot?

The most critical question is whether you're legally allowed to build an ADU. Roughly one-third of U.S. states now have legislation allowing homeowners to build these additional dwellings on residential properties. In other cases, decisions are made at the county or municipal level. Before moving forward, check your state and local zoning ordinances.

If your property qualifies, the next question is: Should you build one? Will it provide value for your family — and does it have the potential to increase your home’s resale value?

Common Reasons Homeowners Choose to Build an ADU

✔️ Multi-generational living — A safe, private space for aging parents or returning adult children
✔️ Rental income — Long-term or short-term leasing potential
✔️ Home office or guest suite — A private, distraction-free zone steps from home
✔️ Future flexibility — Live in the ADU while renovating or downsizing later in life

Proximity & Privacy: How Close Is Too Close?

Another key consideration is placement. Do you want the ADU just steps from your back door for easy access — or tucked farther back on your lot for more separation and privacy?

If you plan to rent the unit, you’ll also want to check local rules about renting to non-relatives. In some jurisdictions, ADUs may be limited to family use only. Resources like AARP’s ADU guide are helpful for navigating these restrictions.

Construction Matters: Why Working with a Pro Is Critical

This isn’t your typical DIY backyard project. Building an ADU requires:

• Full code compliance

• Utility hookups (water, sewer, electric — and sometimes gas)

• Structural integrity and inspections

• Permits and zoning approval

That’s why choosing a professional builder like ValueBuild Homes is essential. Our team will handle the process from start to finish — from securing permits to final inspections — ensuring your investment is protected and fully up to code.

ADU Designs: Detached, Attached, or Internal?

ADUs come in a range of configurations:

• Detached: A small home (like the Emerald C, pictured above) in your backyard

• Attached: A suite addition connected to your main home, often with a private entrance

• Garage Conversion or Lower-Level Suite: A reimagined space within your existing footprint

Designing the right style depends on your goals, your lot, and your budget. For example, a “granny pod” may include ramps and safety features for a senior family member, while a “mother-in-law suite” may feel more like a traditional guesthouse.

Don’t Forget the Details: Style, Size & Layout

Most ADUs range from 600 to 1,200 square feet, and design flexibility is key. You'll want to think about:

• Whether to match your main home’s architecture

• Orientation of doors and windows for privacy

• Shared spaces, like gardens or patios

• Driveway access or separate parking

ValueBuild Homes offers customizable ADU-friendly plans — like our Emerald C model — that combine affordability, efficiency, and style.

Ready to Explore ADUs with ValueBuild Homes?

Whether you’re planning for family, guests, or extra income, ValueBuild Homes can help you design the perfect Accessory Dwelling Unit for your property. With years of experience building affordable, code-compliant homes throughout the Carolinas, we’re here to help you make the most of your land — and your future.

👉 Contact us today (919) 330-4923 to learn more about our ADU-ready home plans, including the Emerald C.