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Larson's Foundation Waterproofing is a Massachusetts crew built around one man's name — Paul Larson — and a specific promise: fix the actual water problem, not the biggest job someone else quoted. Across dozens of Google reviews the same story repeats — cracked foundations sealed, sump pumps installed, French drains dug — and, again and again, customers who say Paul talked them out of a costlier fix another company had pushed. The company has 89 reviews on file dating back to 2021, and Google currently shows it holding a 4.9-star average from 91 ratings. Four reviews have landed in the past six months, all positive — this month, a customer described crack repair and basement sealing done before a finish-out, calling Paul "professional, responsible, and extremely reliable." That shows up across the years too: in a 2024 review, a homeowner who'd been quoted a costly full interior French drain elsewhere said Paul spent more time assessing the problem and suggested a fix that was "significantly less invasive and costly"; a 2023 review described being told by another company that a crack needed a minimum $15,000 excavation, only for Paul to say the big dig wasn't necessary. Customers writing in 2024 and 2025 repeatedly mention the same follow-through afterward — he explained the work before starting and walked through it when done — and one 2024 review reported that after 2 inches of rain in less than a day, the basement stayed dry months after a pump went in. Two older reviews break from that. In a December 2021 review, a customer said they spent over $10,000 on French drains, downspout extensions and crack sealing and still had the same water problem, and said the company refused to honor the warranty or do follow-up work. A separate October 2022 review accused Paul of trying to charge $24,000 for a repair a retired engineer found unnecessary, and described him calling repeatedly afterward. Neither complaint recurs in the reviews since. For foundation cracks, sump pumps, French drains or a wet basement, the volume and consistency since point one way — but given those two older disputes, it's worth pinning down exactly what a quote covers and the warranty terms before signing.
Typical Greater Boston range for this kind of work, from regional averages — not a quote from Larson's Foundation Waterproofing LLC. 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
I highly recommend Larson's Foundation Waterproofing we used them to repair some settling cracks and seal our basement before we finish it . From start to finish, Paul was professional, responsible, and extremely reliable. He did an excellent job repairing the cracks in our foundation and thoroughly sealing our basement, giving us confidence that the work was done right. What impressed us most was the commitment to customer service. Paul took the time to answer our questions and even offered to come back and inspect the work before our contractor puts up the basement walls if there are any concerns. That level of follow-through and accountability is hard to find. If you're looking for a trustworthy company that stands behind its work, this is an excellent choice
Very knowledgeable and professional!!! I would highly recommend Paul.
Great experience! Paul did the waterproofing for our new build and later fixed a foundation crack for us. Professional, reliable, and very pleased with the work. Highly recommend Larson Waterproofing.
Paul is extremely knowledgeable and willing to explain each and every process. He’s always able to answer questions or concerns and we are happy with the work he did on our home.
Paul was fair, honest and did a great job completing the job in a timely manner. He explained everything, cleaned up after the work was done and told me not to hesitate in reaching out with any questions/concerns. Thanks Paul!
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1 change recorded — last scanned Aug 15, 2026.
Basement waterproofing5.0
Retaining walls5.0
Bulkhead replacement4.8
Brick and 1850s fieldstone foundations repointed4.8
Structural carpentry4.8
Owner-led communication4.8