MassDwell Solutions

109 Highland Ave, Suite 203, Needham, MA 02494 20 miles

MassDwell Solutions builds modular ADUs for homeowners, investors & developers. Models range from 470–892 sqft, starting at $164,500. Factory-built steel frame units include full warranties, energy-efficient features & 8–12 week installation.

Turkel Design

1060 Broadway, Somerville, MA 02144 26.1 miles

Prefab Specialist Luxury Builds

Turkel Design offers custom-designed accessory dwelling units (ADUs) using a prefab process. Highlights include expert cabinetry, smart storage, and high-quality finishes, ensuring ADUs feel purposeful and cohesive with the main residence.

Meetinghouse Builders

191 Depot Road, Hollis, NH 03049 30.4 miles

Free Consultation Turnkey Solutions

Meetinghouse Builders offers custom ADU design & construction in Hollis, NH. Services include detached builds, garage conversions, basement ADUs & home additions. Features 3D renderings, style guides & full construction documents.

NorthEast Design + Build

2949 Hartford Avenue, Johnston, RI 02919 31 miles

10 years in business

NorthEast Design + Build offers ADU and in-law apartment construction across Massachusetts & Rhode Island. Services include detached backyard cottages, in-law suites, and attached additions. Serving Milford, Providence, Warwick & more.

John Crowley Construction Co

171 Mattakeesett St, Pembroke, MA 02359 43 miles

Licensed 25 years in business Eco-Friendly

John Crowley Construction Co offers turnkey ADU construction on Massachusetts' South Shore, serving Pembroke, Plymouth, Hingham & more. Licensed (#114197), insured, 25+ years experience. Detached, attached, garage & basement ADUs available.

Amex Construction

15 Industrial Way, Hanover, MA 02339 39.5 miles

Eco-Friendly

Amex Construction is a Hanover-based design-build ADU contractor serving Massachusetts' South Shore. They manage detached ADUs, barn conversions, and basement suites, handling design, permitting, septic upgrades, and construction under one contract.

Spring Home Improvement

16 North Washington Street, Attleboro, MA 02760 25.8 miles

Licensed 13 years in business

Spring Home Improvement offers expert ADU contractor services in Norfolk, MA. Family-owned since 2012, they handle design, permits, and construction with 10+ years of experience, transparent pricing, and a one-year labor warranty.

Provost Companies

20 Maple Street, Stoughton, MA 02072 28.2 miles

ADU Builders of MA

807 Massachusetts Avenue, Boston, MA 02118 28.2 miles

Eco-Friendly

Expert ADU builders serving Massachusetts homeowners. Services include detached ADUs, garage conversions, basement units & in-law suites. Fully permitted, code-compliant builds. Costs from $80K. Serving Boston, Cambridge, Worcester & statewide.

ADU-PRO Corp.

121 Orchard Street, Millis, MA 02054 14.8 miles

Licensed 30 years in business Eco-Friendly

ADU-PRO Corp is a Massachusetts ADU specialist offering full-service construction, permitting, and project management. Led by licensed experts, they help homeowners build granny flats, in-law suites, and backyard cottages up to 900 sq ft.read more

Rockhouse Construction

22 Morgan Mill Road, Johnston, RI 02919 29.9 miles

Luxury Builds

Rockhouse Construction builds ADUs across Rhode Island, including Providence, Warwick, and Cranston. Options include detached, attached, garage, and basement conversions. Costs range from $60,000 to $480,000+, varying by size and finish level.

Other cities in Massachusetts

What you need to know

Searching for top Detached ADU ADU Contractors in Westborough, Massachusetts? Our directory highlights trusted local professionals who specialize in designing and building accessory dwelling units (ADUs).

Working with a qualified Detached ADU ADU Contractor in Westborough ensures your ADU project meets local building codes, zoning laws, and permit requirements. Whether you're planning a detached ADU, garage conversion, or backyard cottage, experienced Detached ADU professionals can guide you through every step.

Westborough homeowners are increasingly investing in ADUs to create additional living space, generate rental income, or support multigenerational living. The Detached ADU experts featured here bring local expertise and proven experience to help make your project a success.

Browse our listings to find the best Detached ADU ADU Contractors in Westborough, Massachusetts, and get started today.

Detached ADU near Westborough, MA