Why Build an ADU?

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.

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.

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.

One of the partners at Capital Dwelling will be your single point of contact through every step of the construction process. We work with a team of insured local contractors, who have years of experience building our products.

Each Capital Dwelling project is equipped with electricity and in many cases we can plug directly into the panel in your primary residence to power the new unit. In some instances, we do need to increase the capacity of the existing panel in order to handle the increase load.

For projects that include a bathroom and/or kitchen, we will connect to the public water and sewer provided by your local municipality. The complexity of these connections can vary significantly by site.

The short answer is “a lot less time than with traditional stick-built construction”. Once the permits are secured, the foundation work, framing and interior build-out would typically require only a couple of weeks on-site. A full ADU with kitchen and bathroom would be be closer to 4 to 6 weeks.