Named crew leads — reviewers consistently credit Wendel and Stephen for the work
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.
2024 property damage report — a reviewer described wall and tile damage left unresolved
2022 unmet follow-up — a reviewer described a cracked slab and no return visit
Key Waterproofing Construction is a Holbrook, Massachusetts basement waterproofing and foundation-protection contractor that says it serves homeowners across Eastern Massachusetts. The company has been in business for about six years, and its on-site work is led by team members customers repeatedly name as Wendel (also spelled Wendell) and Stephen.
Across Angi, HomeAdvisor, and Google, the business has collected 69 reviews since 2022, the large majority five stars. Homeowners consistently credit the crew for sump pump installations, French drain systems, and basement or foundation waterproofing completed quickly and cleanly, with several reviewers describing same-day or hour-long response for a failed sump pump and others reporting a dry basement through repeated storms years after the work.
The record is not uniformly positive. In a March 2024 review, a homeowner described the crew leaving property damage, including a hole in a wall and broken tile, without returning to address it. A separate 2022 review described a poured concrete slab that cracked and pillars that were not installed as agreed, with no follow-up visit after several months. Both accounts are specific and worth asking about directly, particularly for larger concrete or structural scopes rather than a straightforward sump pump job.
For a sump pump, French drain, or basement waterproofing job in the Holbrook and greater Boston area, Key Waterproofing Construction's long, mostly positive track record and Massachusetts trade license make it worth a quote; for bigger structural or concrete work, ask for recent references given the complaints above.
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.
The job was completed well and the crew worked hard. They are experienced craftsmen and communicated effectively with the owner and tenant. The job was done quickly after the agreement was made. The crew was on the job the next day! Workers were friendly and answered our questions.
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!
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."]
