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Typical Greater Boston range for this kind of work, from regional averages — not a quote from BG Foundation Repair. Use it to sanity-check bids, then get the real number in writing.
Not sure which you need? Start with an inspection — many reputable companies assess free, and independent assessments run up to $500.
The wall run getting the drain — a full 30×40 ft basement is about 140 ft.
Estimated range
$7,600 – $15,000
Typical waterproofing project around $11,300
Four basement companies had looked at the horizontal crack running from the window well to the garage; in a June 2026 review, the homeowner said BG Foundation Repair solved it in short order, at a price they called reasonable. That shape repeats: a foundation problem someone else has already quoted, solved smaller and for less. BG works out of Marlborough, and its site describes a family-owned foundation crack repair and basement waterproofing business covering Massachusetts, Rhode Island, Connecticut, southern New Hampshire and southern Vermont. Its Massachusetts home improvement contractor registration is active. The Better Business Bureau grades it A+, Google shows 5 stars across 54 ratings, and Angi 5.0 from seven. Speed is what customers keep describing. One called on a June 2026 afternoon and had Ben there the next morning, the repair finished at the quoted price with no extras. In January 2026 a homeowner texted a photo of the foundation on a Friday afternoon and had a quote back that day; in December 2025 a customer with a leaking crack in Bristol, New Hampshire had the crew there the next day. The job list stays narrow: wall and floor cracks, a garage slab with spalling and minor cracking in May 2026, a parge coat and a corner where water was infiltrating in December 2025, and water coming through a bulkhead in March 2026, where the crew followed up with a second treatment as a precaution. In an April 2025 review, a homeowner said a wall crack another company had already repaired kept leaking, and stopped after BG's fix. A June 2025 customer came back two months later, after heavy rain, to say the seal was holding. More than one homeowner arrived after a bigger proposal elsewhere: in February 2026 one company had recommended a sump pump and another an exterior excavation, and a May 2026 customer who had been pitched expensive solutions said Ben came out the same day and did the repair for a fraction of the cost. When a house went on the market in June 2026, the inspector called the crack repair one of the best he had seen. The real limit is geography — a February 2026 inquirer was well outside the service area and said so plainly, though the questions still got answered. For a wet basement, a cracked foundation wall or a spalling slab, this is the narrow specialist to call rather than a general contractor; send photos with the first message, since quotes here often start from a picture, and get the warranty in writing — a June 2025 customer said one came with the work.
“Anyone in need of Foundation maintenance, contact my buddy at BG Foundation Repairs. Based out of Marlborough, but works all over the state.”
We had an amazing experience with BG Repair, we had them repair a crack in our basement and we are actually selling our house when the inspector came he said it was one of the best jobs he's seen for crack repair and was blown away. They were so responsive and went above and beyond to answer our questions and also guarantee a warrantee of issues to arise. They were beyond helpful will use them again if needed!!!
Just wanted to thank BG Foundation Repair for their quick response and professional repairs to the crack in my foundation. I called in the afternoon and Ben was here the next morning. The repair was competed in no time and according to the quoted price... no extras and no surprises. I highly recommend BG Foundation Repair for anyone requiring professional service on their foundation or other concrete structures.
We had some large cracks in our basement walls. These guys were very professional and did amazing work. Helped to educate us on the cause of the cracks and the process for repair. Great pricing also. I am looking forward to recommending them to anyone who has cracks in their foundation.
Ben Grant did an incredible job at solving a 40 (?) year problem in my basement in very short time, for an incredibly reasonable price. The problem was a horizontal crack in my foundation wall that ran from the window well to the garage. I had 4 basement companies look at it -- all the big names you see on commercials -- who gave me expensive estimates that didn't address the problem. I even had to reschedule Ben twice do to conflicts in my schedule. He patiently followed up and let me know his next availability. He was fast, neat, affordable, and comprehensive in his communications and explanations and went above and beyond. What more can I say? I highly recommend BG Foundation Reapir. I want to add an update 3 weeks later. Since BG Foundation Repair's work, we have had several decent rain storms with downpours and high winds. My basement remained completely dry and actually felt warm(er), which is a first.
Good experience. Would recommend!
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Certified attributes are verified against the public registry. Others are the business's own statement.
1 change recorded — last scanned Jul 1, 2026.
Remodeling work4.3
Chimney rebuilds5.0
Active state license3.6