Key Waterproofing Construction logo
Approved Pro
This pro has maintained an average of 4.5+ star throughout their time with Angi.
Approved Pro

Key Waterproofing Construction

Foundation, Basement or Crawlspace Waterproofing / Encapsulation,
This pro has maintained an average of 4.5+ star throughout their time with Angi.

About us

Serving all of Eastern Mass and So. New Hampshire including North Shore, South Shore, and Cape Cod We pride our company on reliability, great communication, integrity, and quality work. We are experts in Basement Waterproofing and work hard to keep you as educated as we can on your particular task or project. We look forward to earning your business!

Business highlights

11 years of experience

Amenities

Free Estimates

Yes

Warranties

Yes

Accepted Payment Methods

  • CreditCard
Reviews
4.7194 Reviews
Number of StarsImage of DistributionNumber of Ratings
5
89%
4
6%
3
2%
2
1%
1
2%

Filter reviews by service

Showing 1-25 of 194 reviews
Robert M.
Sep 2025
5.0
Foundation, Basement or Crawlspace Waterproofing / Encapsulation
Outstanding presentation, outstanding work. Completed and cleaned up everything and a very fair price. Workers never stopped except for water. Unbelievable pace and quality! Thank you Key Construction. Bob from Dartmouth

Robert S.
Jul 2025
5.0
Foundation, Basement or Crawlspace Waterproofing / Encapsulation
$6,488
I've had other waterproofers come and do work, but long story short Stephen and his team did excellent work. He was able to help me: - Reclaim some more basement space by filling my moving the sump pump into the utility area of my basement - Figured out at a glance what needed to happen - Explained to me how the entire system work - Answered any and all questions I had honestly Not only did he listen to all my concerns and was honest

Greg C.
Jun 2025
5.0
Foundation, Basement or Crawlspace Waterproofing / Encapsulation
$6,800
Stephen and his team are very professional and executed on the job in a timely matter. Additionally, they were able to provide insights into other aspects of the construction process. Look forward to working with them again in the future.

Darshan R.
Nov 2024
5.0
Foundation, Basement or Crawlspace Waterproofing / Encapsulation
Yes, I recommend this pro
Na

Paul S.
Aug 2024
5.0
Foundation, Basement or Crawlspace Waterproofing / Encapsulation
Yes, I recommend this pro
I had a great experience with them, from the estimation process through to the end.

Joe S.
Jul 2024
4.0
Yes, I recommend this pro
Great job on 2 sump pump installations

Anand S.
Jun 2024
5.0
Foundation, Basement or Crawlspace Waterproofing / Encapsulation
Yes, I recommend this pro
Great job by Wendel and his crew

Dave B.
Jun 2024
5.0
Foundation, Basement or Crawlspace Waterproofing / Encapsulation
Yes, I recommend this pro
effective, punctual, tidy

LIYA L.
Jun 2024
5.0
Foundation, Basement or Crawlspace Waterproofing / Encapsulation
Yes, I recommend this pro
Had the job done in 2 days, so far so good. I hope our basement leaking problem is permanently solved

Tasha H.
May 2024
5.0
Yes, I recommend this pro
They came out quickly on a Sunday and work started on that Monday. I couldnâ  t find a better price. They work was quick and they clean up really good after themselves. My basement is finally waterproof and I have had several rains since itâ  s been installed. Finally a dry basement and peace of mind. Highly recommended!

Rishi K.
May 2024
5.0
Foundation, Basement or Crawlspace Waterproofing / Encapsulation
$11,000
I would give more than 5 stars for this team & company because they were very punctual in time, their work ethics, their responsibility of delivering the committed job and I never over looked what they were doing through out the whole project. I hired the Key Waterproofing in November and targeted to start the work on December 2nd, 2023. Early morning around 7 am on 2nd Dec, I met Wendel Touisant who is the Project Manager. He explained the workplan, time table, mutual expectations, care after work completion etc. Wendel worked with his expert guys who completed the water proofing project on time as he targeted. After completion of the work, we surveyed the work and he assured me that my basement will never get a single drop of water ever which company provided a warranty certificate. During January/February of 2024, there were plenty of rain & flooding across North Attleboro vicinity but NOT even a single drop of water in my basement. I would definitely recommend the Key Waterproofing company.

Sheila O.
Apr 2024
5.0
Foundation, Basement or Crawlspace Waterproofing / Encapsulation
Yes, I recommend this pro
After living in this house for 38 years ( original owner), I was surrounded with trees. All trees are gone and I'm now at the bottom of a hill the builder made for new houses. Have 2 sump pumps with never having water in a finished basement, now when it rains we get water. Call Ed, he came right out and we signed a contract with an open installation date. After last storm Ed put us on priority list, crew come in and jackhammer around the basement and installed a French drain and added a 3rd pump. Job was finished in 2 days, all trash and cleaning done. Wendel came by to check on the work, we are waiting for a couple of finishing items ( pump cover and outside drain pipe finish ). These 2 guys were amazing with the amount of cement that had to be taken out, the stone carried in 5 gallon buckets, the mixing of cement to repair the floor. We gave them lunch and whatever they needed for drinks. I see a few bad reviews on this company but I would say it's the customer looking for too much perfection. This company is great with their prices, warranty, and their very hard working employees, Ed always responded when calling with questions or concerns.

Thomas D.
Mar 2024
5.0
Foundation, Basement or Crawlspace Waterproofing / Encapsulation
Yes, I recommend this pro
I highly recommend Key Waterproofing. I have a main basement and a small storage basement. Both flood every time it rains. Our drainage was not working and we called Key Waterproofing. Ed and Wendell along with their team were fantastic. The job was finished within the timeframe we were given and the price was very good compared to their competitors. Overall we are very happy with the results.

Elizabeth C.
Mar 2024
5.0
Foundation, Basement or Crawlspace Waterproofing / Encapsulation
Yes, I recommend this pro
We were worried about the cement dust covering everything in our basement as they dug up the floor to install a French drain system. I watched them carefully tape up plastic sheeting just at I described. They were thorough and very pleasant to work with.

Craig H.
Mar 2024
5.0
Foundation, Basement or Crawlspace Waterproofing / Encapsulation
Yes, I recommend this pro
Did a great job, they still have to come back and finish the outdoor work when the weather permits.

Do S.
Mar 2024
5.0
Foundation, Basement or Crawlspace Waterproofing / Encapsulation
Yes, I recommend this pro
This company is very responsive, the quote was quick and most reasonable(I had 4 other quotes). They did work very quickly and efficiently. No complaints. Highly recommend!!

Penelope M.
Feb 2024
5.0
Yes, I recommend this pro
Wendel and Steve are very professional and know what they are doing. The job was done in a timely fashion and the crew was most courteous. The cost was fair and o am greatly appreciative for what Keys has done for me

James S.
Feb 2024
5.0
Foundation, Basement or Crawlspace Waterproofing / Encapsulation
Yes, I recommend this pro
Professional and conscientious.

Deborah C.
Feb 2024
5.0
Foundation, Basement or Crawlspace Waterproofing / Encapsulation
Yes, I recommend this pro
Wendel and his team did a great job installing the system. They were fast and cleaned up all debries after. Listen well and were respectful and considerate. Great value for money .

Peter D.
Feb 2024
5.0
Yes, I recommend this pro
Great company. Easy to deal with. Did what they said they would do and delivered on the pronise.

Kirk D.
Feb 2024
5.0
Yes, I recommend this pro
Wendell and his crew did a wonderful job in fact we needed his services asap and they came very next day !! Recommend highly .

Patricia F.
Jan 2024
5.0
Foundation, Basement or Crawlspace Waterproofing / Encapsulation
Yes, I recommend this pro
Wendel was wonderful. Very efficient and quick service. I would recommend them to anyone in need.

Nicolas D.
Jan 2024
5.0
Yes, I recommend this pro
$9,400
Great people, great work. Super professional and really detailed oriented. They leave the place really clean. On the down side: they are not the best communicators in terms of scheduling in advance until they have an opening to get the job done. But when they start they speed up and are super efficient! I definitely recommend.

Amy B.
Jan 2024
5.0
Yes, I recommend this pro
Wendell installed a drainage system for me and has returned to maintain it. He and his team know their stuff! They scheduled me quickly, were responsive to my calls/messages, and educated me about the system and it's care. I highly recommend Wendell and Key Waterproof.

Justin C.
Jan 2024
5.0
Foundation, Basement or Crawlspace Waterproofing / Encapsulation
Yes, I recommend this pro
Fantastic - fit me in on short notice because of emergency. I hope I never need them for anything again, but if I do I will use them without any doubt A
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Showing 1-25 of 194

Licensing

State Contractor License Requirements

All statements concerning insurance, licenses, and bonds are informational only, and are self-reported. Since insurance, licenses and bonds can expire and can be cancelled, homeowners should always check such information for themselves. To find more licensing information for your state, visit our Find Licensing Requirements page.

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FAQ

Key Waterproofing Construction is currently rated 4.7 overall out of 5.

Monday: Open All Day Tuesday: Open All Day Wednesday: Open All Day Thursday: Open All Day Friday: Open All Day Saturday: Open All Day Sunday: Open All Day

Key Waterproofing Construction accepts the following forms of payment: CreditCard

Yes, Key Waterproofing Construction offers free project estimates.

No, Key Waterproofing Construction does not offer eco-friendly accreditations.

No, Key Waterproofing Construction does not offer a senior discount.

No, Key Waterproofing Construction does not offer emergency services.

Yes, Key Waterproofing Construction offers warranties.