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Verified record
Gannon Construction, run by Patrick J. Gannon and trading out of Weymouth (BBB lists the address as Cohasset), is a residential general contractor working in additions, remodeling, garages, decks, windows, doors, roofing and kitchen/bath work. The Better Business Bureau grades the company A+, though its page states the company is not BBB-accredited. The written record is entirely dated: six HomeAdvisor reviews run from April 2002 to May 2010, together covering additions, dormers, basement remodels and a garage-plus-living-area project. A May 2010 review said simply the client was 'pleased with our new room'; a July 2006 review praised a dormer on a cape house as 'beautiful and beyond our expecting'; and an April 2002 review recounted a project finished in two and a half months against a four-month quote, on budget, with the client contrasting Patrick favorably against 'horror stories about contractors.' A November 2003 review, while calling the finished work's quality superior, said it would have preferred a clearer project communication and timeline plan going in, and an October 2002 review noted a few missed 'telephone tag' calls alongside overall satisfaction. The company's own founding date is inconsistent across its listings: HomeAdvisor's profile text says it was founded in 1990 and claims 'over 18 years of construction experience,' while a business-highlights line on the same page says 26 years, and BBB separately states the company started in 1996 with 30 years in business — three different starting points for the same firm, worth asking about directly.
Typical Greater Boston range for this kind of work, from regional averages — not a quote from Gannon 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
They were prompt, professional and courteous. We are very pleased with our new room.
Very professional, clean. Great workmanship and attention to details. Good communication. Would highly recommend Patrick Gannon for any type job. The dormer on our cape is beautiful and beyond our expecting.
Thq quality of the work is superior! They came up w/ solutions we would've never thought and it looks great. If this was combined with an excellent project communication plan so I knew what was happening when, then the team would be unstoppable. Would definitely use again but would insist on sitting down and mapping the project time line first. (For my own comfort)
There were a couple of telephone tag calls; but, for the most part this company exceeded my expectations. I definitely would use this company again!
He stands by his work. With every construction project there are unexpected issues. He was a good listener and was very helpful. Good communication is one of his strongest attributes.
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1 change recorded — last scanned Aug 2, 2026.
Detailed craftsmanship5.0
Renovates century-old structures5.0
