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Home addition contractors in Boston

The 10 home addition contractors 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

Bump-out
$29,500 – $71,000small single-room extension
Room addition
$94,500 – $236,000ground floor, finished
Second-story addition
$177,000 – $472,000whole or partial floor
Boston vs US
+18%well above the US median

Licensing in Massachusetts. Massachusetts requires Home Improvement Contractor (HIC) registration, and structural work needs a Construction Supervisor License (CSL).

Number 1: Tba Designs

5.0(23)out of 5, from 23 reviewson GoogleActon, MA

Thomas Buckborough & Associates is a design-build firm in Acton serving Greater Boston. It designs and builds home additions such as sunrooms, in-law suites and second stories, planned to keep the character of the original house.

(978) 263-3850 358 Great Rd, Acton, MA 01720

Number 2: Hawthorn Builders

5.0(20)out of 5, from 20 reviewson GoogleNeedham, MA

From its Needham base, Hawthorn Builders handles design and construction of custom homes across Greater Boston. The company also takes on renovations, home additions and ADUs, in towns including Brookline, Watertown and Beacon Hill.

(781) 707-6564 97 Chapel St #3, Needham, MA 02492

Number 3: Home Additions & ADUs

5.0(18)out of 5, from 18 reviewson GoogleNatick, MA

M&A Contractors builds home additions and ADUs in Natick, Newton, Wellesley, Weston, Needham, Dover and Greater Boston. Work covers second stories, primary suites and kitchen expansions, built from an architect's plans or planned with the homeowner, with permitting, framing and finish handled in-house.

(860) 287-5215 76 Summer St, Natick, MA 01760

Number 4: Boston Construct

4.9(24)out of 5, from 24 reviewson 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

Number 5: General Contractors Boston

4.9(13)out of 5, from 13 reviewson GoogleBoston, MA

A D Construction is a design-build remodeler in Boston's South End handling residential projects. Its work runs from kitchens and bathrooms to additions, attic conversions, basements, carpentry, closets and storage, decks and roof decks, and window replacement.

(617) 201-1018 22 Milford St, Boston, MA 02118

Number 6: US Pro Paint

4.8(218)out of 5, from 218 reviewson GoogleHingham, MA

Based in Hingham, US Pro Paint & Renovation adds living space to homes on the South Shore, in Greater Boston and on Cape Cod. It builds additions and finishes basements, covering design, permits, structural framing and interior work under one contract.

(800) 964-0717 175 Derby St Ste 4, Hingham, MA 02043

Number 7: Home Addition in Walpole, MA

4.5(8)out of 5, from 8 reviewson GoogleNeedham, MA

Colony Home Improvement is a Needham remodeler that builds home additions in Walpole and the greater Boston area. It works with families who want to expand their current home instead of relocating.

(781) 453-9977 280 Hillside Ave, Needham, MA 02494

Number 8: For Ma

No Google reviews yetBoston

Forma Construction builds custom home additions on the North Shore and in Greater Boston. Projects include sunrooms, garage conversions, room additions and second stories, with the team coordinating from early planning through final completion.

Number 9: Home Addition Ma

No Google reviews yetBoston

Operating as Aureli Construction, this Greater Boston contractor builds home additions and also takes on whole-house remodels, kitchen renovations and basement finishing. Its work extends to Medford and other communities around the city, and the firm helps owners weigh adding space against moving to a new house.

Number 10: Home Additions & Exterior Remodels in Boston

No Google reviews yetBoston

This Boston contractor builds home additions and takes on exterior remodeling work for houses around the city.

What home addition contractors charge in Boston

In Boston, a bump-out typically costs $29,500 – $71,000. Remodeling labor in Boston runs about 18% above the US median, which accounts for most of the difference from the same project elsewhere.

How to choose between them

  • Check the license yourself. Where Massachusetts or Boston licenses this work, the licensing board's own lookup confirms a license number in a minute. Do it before you sign, not after.
  • Get three bids on the same scope. Written down, split into labor, materials, allowances and anything structural. Most people compare a total against a total and end up choosing between two different projects.
  • Ask what is not included. Permits, debris removal, fixture and finish allowances, and repairs after demolition are the four that turn a cheap bid into an average one.
  • Never pay a large deposit up front. A deposit to order materials and hold a start date is normal. Half the total before anyone shows up is not.

How this list is ordered

These are the firms from Google's results for "home additions 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.

Home addition contractors in Boston: common questions

Do I need an architect for a home addition?

Usually yes, or a design-build firm with in-house design. Additions need stamped structural drawings for the permit in most places, and zoning review on setbacks, height and lot coverage.