Prompt response — one recent customer reported arrival within an hour
Dry-basement results — customers describe no water after heavy rain
Detailed projects — reviews name drains, pumps, and encapsulation
What does basement waterproofing cost in Greater Boston?
Typical Greater Boston range for this kind of work, from regional averages — not a quote from Key Waterproofing Construction. 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.
Estimate detail — request a line-item scope and equipment warranty
Project pricing — reported costs range from $1,400 to $11,000
Key Waterproofing Construction focuses on basement and foundation water problems across Eastern Massachusetts. Customers describe sump-pump replacements, French drains, crawl-space and basement waterproofing, foundation drainage, and an egress-window excavation.
The written reviews are unusually specific about the work: customers mention dry basements after heavy rain, organized crews, clear explanations, and prompt responses. A February 2026 reviewer said the team arrived within an hour after a sump-pump failure; older reviews describe completed drainage and encapsulation projects with reported costs from $1,400 to $11,000.
Before booking, ask for a written diagnosis, drainage design, equipment warranty, and a line-item estimate. The company says it serves Eastern Massachusetts, while directory profiles identify it in Holbrook and give it an A+ BBB grade.
Read the comments
Most recent comments
4.0Aug 20, 2026
Really impressed with the work from Key Waterproofing Construction.
The team arrived on time and handled everything in a very professional way.
They paid attention to the small details and kept the work area organized.
The finished work looks great and gave me confidence in the quality.
I would happily recommend them to anyone looking for reliable waterproofing work.
Wendel came right out and replaced two sump pumps and battery backups for us. Communication was clear and professional and he seems knowledgeable. Very happy with my experience!
Our sump pump broke down and they were here within an hour! Highly highly recommended! (Sump Pump or Interior Foundation Drains Installation; reported cost $1,400)
Sump Pump or Interior Foundation Drains Installation — $1,400. Our sump pump broke down and they were here within an hour! Highly highly recommended! [Response from Key Waterproofing Construction: "Thanks Andy, even though you had another company?s system, it was important for Key Waterproofing to respond to the call when you needed it."]
