Local business · Waltham, MALocal business · 681 Main St Ste 2-14, Waltham, MA 02451
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When Boston Magazine wrote up a modernized house in February 2026, Connaughton Construction was the builder on it — working with architect Guy Grassi to take out the wall between the original dining room and the kitchen for a more open floor plan, a change the homeowner called "a game changer." That is the kind of job the Waltham firm is built around. President John Connaughton started as a carpenter on Back Bay and Beacon Hill townhouse renovations and has run the company for more than 44 years, by its own account, and it says several of its project managers have been there 23 to 35 years. Boston, Brookline, Newton, Chestnut Hill, Weston and Lincoln are among the towns it lists. Its Massachusetts home improvement contractor registration, #137130, is active on the state registry, and Houzz lists construction supervisor license CS-040128. Five Houzz ratings average 5.0, 46 permitted projects are on file with BuildZoom, and its Better Business Bureau page is an A+. The listed work runs from new construction and custom homes through additions, Victorian renovations, and kitchen and bath remodels — a firm set up for a project with drawings and a schedule. Ask who would run yours day to day, and settle the scope, allowances and payment schedule in writing before the first check.
“The property was strategically modernized through a collaboration with architect Guy Grassi and Connaughton Construction, removing a wall between the original dining room and the kitchen to create a more open floor plan, something the homeowner calls “a game changer.” They also bumped out part of the house to create a mudroom, laundry room, and powder room on the first floor. “It’s historic, but it didn’t have very modern spaces, and as soon as I knew we were going to do a big overhaul, I got in touch with Rachel,” the homeowner says. ... Architect Grassi Design Group Builder Connaughton Const”
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1 change recorded — last scanned Sep 5, 2026.
Typical Greater Boston range for this kind of work, from regional averages — not a quote from Connaughton Construction. Use it to sanity-check bids, then get the real number in writing.
Estimated range
$23,000 – $35,000
Typical remodeling project around $29,000
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Renovates century-old structures5.0
Basement flood repair completed while owners traveled3.2
Multi-trade condo work4.1
