FAQs

An Accessory Dwelling Unit (ADU) is a self-contained living space located on the same property as a single-family home. They are also known as granny flats, in-law suites, backyard cottages, guest houses, or garage apartments. In addition to multiple names, they also have a variety of uses, including backyard home, studio space, home office, pool house or even a golf simulator.  

ADUs can be developed by right in Washington, DC, and many surrounding counties. Capital Dwelling will guide you through the zoning approval process based on your jurisdiction. If you have questions about local regulations, reach out to us with your address for a personalized assessment.

Prefab construction involves building all or part of the ADU in a controlled manufacturing facility before transporting and assembling it on-site. This method is typically 20-30% more efficient than traditional construction, reducing delays and material waste. However, prefab units may have higher transportation and installation costs and less design flexibility.

The timeline depends on several factors, including permitting, site conditions, and project complexity. Regulatory hurdles such as zoning variances, environmental restrictions, and community opposition can extend the process. Having an experienced professional to navigate these challenges is essential.

Yes, regulations vary by jurisdiction. Some common requirements include:

• The homeowner must reside in either the main house or the ADU.
• Only one ADU is allowed per property.
• Short-term rental policies vary widely and may change over time.
• Homeowners associations (HOAs) and historic districts may have additional rules regarding size, location, and design.

Yes. We do not offer cookie-cutter solutions; each ADU is custom-designed to meet the homeowner’s needs. From layout to materials to interior finishes, we work with you to match your vision while staying within budget.

The maximum ADU size depends on your backyard’s dimensions and local zoning regulations. Our team will conduct a site visit and recommend a size and placement that aligns with your property’s conditions.

While most jurisdictions do not regulate ADU design, local zoning laws dictate size, height, and placement. Some HOAs and historic districts impose additional style and material requirements, but there is usually room for customization.

• Electricity: In many cases, the ADU can be powered by the existing panel in your primary residence. If additional capacity is needed, an upgrade may be required.
• Plumbing: ADUs connect to public water and sewer lines. If your property uses a well or septic system, additional capacity assessments may be needed to comply with local regulations.

Costs vary based on size, build complexity, and site conditions. Typically:

• 60-70% of costs go to construction, materials, labor, and overhead.
• 30-40% cover design, engineering, permitting, utility connections, and site preparation.

Some of the biggest cost drivers include:

• Utility connections, such as upgrading electrical capacity, water, or sewer
• Site conditions, including grading, tree removal, demolition of existing structures)
• Permitting and regulatory requirements, including zoning, environmental studies, historic district approvals)

Capital Dwelling does not provide direct financing, but most clients use:

• Home equity loans or HELOCs
• Cash-out refinancing
• Lenders specializing in ADU financing

Depending on your financial situation, you may qualify for tax benefits related to home improvement financing. Consult a tax professional for details.

Adding an ADU increases your home’s total livable space and can generate rental income, both of which positively impact property value. The exact increase varies by location and market conditions.

ADUs offer both short and long-term benefits:

• Multi-use flexibility – They can serve as a guest house, home office, rental unit, or multi-generational living space.
• Increased property value – More livable space and potential rental income.
• Increased home usability – New living space designed specifically to accommodate your needs
• Passive income opportunities – Renting your ADU can provide a steady revenue stream.

Rental income depends on location, size, and ADU quality, as well as whether you offer short-term (Airbnb) or long-term rentals. Some homeowners maximize income by moving into the ADU and renting out their primary residence.

Unanticipated permit requirements (zoning, land development, subdivision approvals) can add months to the project timeline.

If your site has stormwater restrictions, forest conservation rules, or tree removal regulations, you may need to bring in specialists, increasing costs and extending approval time.

Expanding water, sewer, or electrical capacity can add significant costs, especially if topography makes connections difficult.

Many homeowners underestimate site preparation costs, such as:

• Demolition of existing structures
• Land grading and drainage solutions
• Tree removal and landscaping after construction

Issues such as easements, deed restrictions, and covenants can prevent or limit where you can build. A professional survey early in the process can help avoid surprises.

We offer a seamless, stress-free experience from start to finish, providing expert guidance on every aspect of your ADU project. Our approach stands out because:

• Custom Design Solutions – No one-size-fits-all templates. Your ADU is designed to fit your unique needs.
• Local Expertise – We navigate zoning laws, permitting, and utility connections specific to DC, Maryland, and Virginia.
• High-Quality Craftsmanship – We partner with trusted builders to ensure superior construction.
• End-to-End Support – From feasibility assessments to final inspections, we handle the details so you don’t have to.

Yes! Unlike builders or prefab companies that push their own products, Capital Dwelling acts as an experienced, unbiased consultant and advisor to help homeowners navigate the entire ADU process.

We assess your property, budget, and goals to determine the best approach, whether that means a custom-built ADU, a prefab solution, or even deciding that an ADU isn’t the right fit. Our priority is your best interest, ensuring you make informed decisions without pressure or sales tactics.