The 10 ADU builders from Google's results for Boston, Massachusetts, ordered by Google rating weighted by review count. No firm pays to be listed or ranked.
Last updated
Licensing in Massachusetts. Massachusetts requires Home Improvement Contractor (HIC) registration, and structural work needs a Construction Supervisor License (CSL).
on GoogleWoburn, MA
Based in Woburn, FiveTen Construction & Design builds custom accessory dwelling units across Massachusetts. Projects range from backyard cottages and detached studios to basement conversions, and the firm carries each one from design through the permitting stage and into construction.
(781) 507-4767 462 Washington St #2232, Woburn, MA 01801
on GoogleBedford, MA
Working across Greater Boston from a base in Bedford, this contractor designs and builds accessory dwelling units. Its ADU work focuses on adding separate living space to existing residential lots, whether for relatives, rental tenants or other flexible uses on the property.
(781) 515-0045 65 Hancock St, Bedford, MA 01730
on GoogleBoston, MA
Boston Construct builds home additions and ADUs for Boston homeowners who need more room but want to stay in their neighborhood. Its work addresses tight lots and layouts that no longer fit how a household lives.
(617) 697-1719 1660 Soldiers Fld Rd Ste 7 1094, Boston, MA 02135
on GoogleBoston, MA
Horizon ADU designs and builds custom accessory dwelling units for Boston-area homeowners. The company turns unused parts of a residential lot into separate housing, giving owners a way to house relatives or bring in rental income from a second unit on their property.
(774) 222-0127 77 King St, Boston, MA 02122
on GoogleBoston, MA
Boston Plans works on accessory dwelling units in Boston, Massachusetts.
(617) 722-4300 1 City Hall Square #9, Boston, MA 02201
Boston
Boston ADU Builder handles accessory dwelling unit construction in Boston.
Norwell, MA
From Norwell, ADU Building Systems produces modular accessory dwelling units in a climate-controlled factory and handles design and construction across Massachusetts. Homeowners can tour the plant to watch units go from framing to final assembly, and the finished units serve as family suites or rentals.
(508) 789-0634 320 Washington St, Norwell, MA 02061
Boston
Builds accessory dwelling units in the Boston area.
Boston
Studio Luz Architects is a Boston design practice whose ADU work includes a modern backyard unit for a historic single-family house in Jamaica Plain. That project was planned as a rental, giving the owners extra income from a second dwelling on the same lot.
Boston
Hybrid Built Home makes custom modular ADUs for properties in Greater Boston and Berkshire County. Each unit is a self-contained home with its own kitchen, bath and living room, and a hybrid build process shortens on-site construction, reducing crew time and noise in the backyard.
In Boston, a garage conversion ADU typically costs $71,000 – $177,000. Remodeling labor in Boston runs about 18% above the US median, which accounts for most of the difference from the same project elsewhere.
These are the firms from Google's results for "adu builders boston", with directories, chains and suppliers removed. They are ordered by Google rating weighted by review count, and the ratings shown are Google's. No firm pays to be listed or ranked. The list was last updated in October 2026.
It depends on your city and state. California, Oregon and Washington have state laws that make ADUs allowed on most single-family lots. Elsewhere it is set by local zoning, so check lot size, setback and owner-occupancy rules with your city first.