Verified record
Gagnon Construction is a Chelmsford builder whose website says Larry Gagnon has been building additions and remodeling homes for over twenty-five years. The website lists a service area that includes Acton, Andover, Bedford, Billerica, Cambridge, Concord and Lexington. In 2024, a customer said Gagnon installed a new roof at the price and product stated, and found previous work around the chimney that was a water access point and took care of it with minimal added cost. Laurence Gagnon's Massachusetts home improvement contractor registration, number 108258, is expired on the state registry.
I had a new roof installed by Gagnon and they did a great job. They delivered on the price and product as stated and were very professional throughout the installation. I had a few other quotes from other companies that were higher than what Gagnon offered with little transparency on the cost. The guys from Gagnon were very transparent and helpful throughout the installation. They discovered some previous work around my chimney that was a clear water access point and took care of it with minimal added cost. I would absolutely use them again for other projects.
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2 changes recorded — last scanned Sep 22, 2026.
Typical Greater Boston range for this kind of work, from regional averages — not a quote from Gagnon 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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Gut remodels of every rental unit's kitchen and bath4.0
Design-build additions3.8
34 years in business3.7
State-verified Home Improvement Contractor license since 20253.3
