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Accessory Dwelling Units

ADU Design and Construction

An accessory dwelling unit turns extra space into an independent home—for a parent, an adult child, a guest, or future rental flexibility. We design ADUs that live well and meet the standards independent occupancy requires.

ADU Design and Construction for Boston-area homes by Capstone Design Partners

What ADU Design and Construction Includes

  • Internal, attached, or detached ADUs
  • Kitchen, bath, and private entrance
  • Utilities and life-safety planning
  • Permitting and legal occupancy
  • Foundations, framing, and finishes
  • Multigenerational and rental layouts

Every element is coordinated as one design-build project—see how the approach comes together in our related collection.

Our Design-Build Process

Because one accountable team handles both design and construction, your adu design and construction follows a clear path: consultation, existing-condition review and 3D scanning, design and scope development, budget alignment, permitting, construction coordination, and a final walkthrough. Learn more about our team.

Service Areas

Capstone provides adu design and construction throughout Greater Boston, MetroWest, and Norfolk County, including Boston, Foxborough, Newton, Wellesley, Weston, Needham, Brookline, Lexington, Cambridge, Belmont, Milton, Hingham, and the surrounding communities. See all areas we serve.

Related services

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Frequently asked questions

What is an ADU?

An accessory dwelling unit is a self-contained residence—kitchen, bath, and typically its own entrance—created within or alongside an existing home.

Do ADUs require special permits?

Yes. ADUs are held to the standards of independent living, so permitting, utilities, and life-safety planning are central to the design.

Can a basement or garage become an ADU?

Often, yes. Basement and garage-to-ADU conversions are among the most efficient paths to a legal, comfortable second dwelling.

Planning an adu design and construction project?

Book a private design-build consultation. We'll explore your goals, your home, and what's possible.

Schedule a Design Consultation Typically a 45-minute conversation. No pressure, no obligation.
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