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A.J. Waterproofing, LLC

Foundation, Basement or Crawlspace Waterproofing / Encapsulation,

About us

We a family run waterproofing specialist company that has been owned and operated since 1976 by A.J. DiElsi. We have one crew, one truck and start and finish one job at a time. We are completely insured with general liability and workman's compensation. There is no charge for estimates and we take no deposits on any job. You pay us upon completion of the job. We do not have salesmen. A.J. is the gentleman that comes out to give each estimate and he is on each job. We do impeccable workmanship, and the jobs are always left cleaner than when we arrived. We give a lifetime guarantee on our French Drains and it is transferable to new homeowner. Please feel free to call with any questions 610-409-0888.

Business highlights

50 years of experience

Services we offer

Waterproofing

Amenities

Free Estimates

Yes

Reviews
4.615 Reviews
Number of StarsImage of DistributionNumber of Ratings
5
80%
4
7%
3
0%
2
0%
1
7%

Filter reviews by service

Showing 1-15 of 15 reviews
Jeff D.
Jun 2026
5.0
Foundation, Basement or Crawlspace Waterproofing / Encapsulation
$6,500
I had a water problem in the basement of my store. It appeared on Saturday. AJ and Caroline were amazing. Immediately they asked a lot of questions and recommended a way to test for diagnosis of the problem. AJ met with me and we agreed on the remediation. His team arrived today on time and went to work. By 2:30 they installed a French Drain and cleaned up so it looked like no one had even been here. They also installed a sump pump. AJ is a real professional. He is courteous, and reliable. I would recommend him to anyone who has any difficulty that requires waterproofing services. The price was very fair as well.

Carlos Q.
Apr 2026
5.0
Foundation, Basement or Crawlspace Waterproofing / Encapsulation
These guys are as professional as they come! Very courteous and informative of the process. If you’re looking for waterproofing work? LOOK NO FURTHER….There’s only 5 ⭐️ I give them 10 ⭐️ ⭐️.

CAROLYN G.
Mar 2025
5.0
Foundation, Basement or Crawlspace Waterproofing / Encapsulation
Following several puddle producing heavy rains, we decided it was time to address our damp basement. AJ Waterproofing responded promptly, offering to take a look at the project same day. AJ examined the interior and exterior of our foundation and recommended extending our partial French drain. We chose to engage AJ Waterproofing for our project based on their fair pricing and excellent customer service. AJ and his team arrived on time, completed the project efficiently and left our basement and their exterior work area cleaner then they found it. AJ and his team went the extra mile to ensure that our waste line was properly supported replacing our stacks of old bricks with wall mounted supporting pegs. We are pleased with the installation of the new portion of French drain and recommend checking out AJ Waterproofing for your waterproofing needs

Joel F.
Feb 2020
5.0
Yes, I recommend this pro
We recently had work done by AJ Waterproofing and cannot say enough about their work. From the minute they arrived, AJ was like a maestro conducting his very capable crew to establish a containment area to prevent dust and debri from permeating the rest of the house. Every effort was made to cover furniture, speakers and carpet with plastic. From there, it only got better. AJ and crew made short work of jack hammering the floor, tunneling under the existing paneled wall without disturbing the paneling and trim. This alone saved me a few thousand dollars on repair and replacement. His crew continuously swept and discarded debri to ensure a clean work area.. Without even asking, his guys installed the drains for our furnace condensation line, softener and dehumidifier within the french drain system. The coup de gras was a meticulous cleanup, which included wiping down the floor and walls, making it cleaner than when he started! I highly recommend AJ for all your waterproofing needs. A true pro.

Kevin K.
Jan 2020
5.0
Yes, I recommend this pro
We recently used AJ's Waterproofing Services to fix our water issues in our basement and we couldn't be happier with the job him and his team did. It was very apparent from our consultation with him that he is the ultimate professional. He spent over an hour and a half with us explaining the issues at hand in our basement and the different options we could go with to remedy the situation. It never once felt like he was out to oversell us or take advantage of us. We knew very quickly he was the man for our job. The day of the French drain install, he sent us multiple updates throughout the day. After they were done for the day, they thoroughly cleaned the area. There were no traces of dust and debris from where they dug up the concrete. We just had a major rain storm and we had no water in the basement. I would highly recommend AJ's Waterproofing for all of your water issue needs.

Tim C.
Jul 2019
0.5
These guys have no idea what they are doing. I hired them to remedy two leaking window wells. Both leaked in less than one year. He sent his son to fix one, the other one still leaks. I sent him photos and he had the nerve to ask me who put the PVC pipe so close to the foundation? Ummm, you guys did? This is your botched job. They should stick to boarding horses because waterproofing basements clearly is not what they are good at. Avoid this company.

Janet T.
Feb 2018
5.0
Foundation, Basement or Crawlspace Waterproofing / Encapsulation
Yes, I recommend this pro
Great service, professional, knowledgeable, affordable and fast and tidy. A crew came out on a holiday and took care of my issue post haste. Would definitely hire again.

John M.
Dec 2017
N/A
Foundation, Basement or Crawlspace Waterproofing / Encapsulation
Yes, I recommend this pro
They were very professional and efficient!

Deborah L.
Jul 2017
5.0
Foundation, Basement or Crawlspace Waterproofing / Encapsulation
Yes, I recommend this pro
Quick service. Provided multiple options that would fit my budget.

Sheldon W.
Jun 2017
5.0
Foundation, Basement or Crawlspace Waterproofing / Encapsulation
Yes, I recommend this pro
Water / dampness in basement - 1st appt with AJ was a walk thru and he shared recommendations on options he could or i can try to remediate. AJ checked in with us a week later to see how we made out. Our attempts minimally helped, but did not fix. AJ was aware of time constraints, team came in, hustled and completed in one day. super impressed with quality of work, professionalism and cleanup.

Sandra M.
May 2017
5.0
Foundation, Basement or Crawlspace Waterproofing / Encapsulation
Yes, I recommend this pro
You're lucky if you get them.

Howell M.
May 2017
5.0
Foundation, Basement or Crawlspace Waterproofing / Encapsulation
Yes, I recommend this pro
AJ Waterproofing is a thoroughly professional waterproofing business. Clean, fast, top quality workmanship and friendly! I would definitely recommend them to anyone who is in need of water alleviation in their basement! Do it correctly the first time - hire AJ Waterproofing!

Ruth G.
Jan 2017
4.0
Yes, I recommend this pro
AJ didn't try to oversell me on unnecessary work proposed by other contractors. He removed a truckload of stuff from the basement room with the water problem at no extra cost. When they finished installing the interior & exterior drains and cleaned the floor the room was cleaner than when they started. After one rain there was some water on the floor but it dried before AJ could come out. We haven't had a heavy rainfall since to really test the system, but I'll increase the rating to 5 stars when it's had more of a test.

Bill R.
May 2016
5.0
Foundation, Basement or Crawlspace Waterproofing / Encapsulation
Yes, I recommend this pro
AJ provided me with a thorough and very professional assessment of our basement water issues and I chose him over several other contractors based on his obvious knowledge, no-nonsense straight talk and strong references. He and his crew did a top notch job installing the interior perimeter drain system and two sump pumps in our large basement, as well as exterior regrading and foundation waterproofing at a very reasonable price. He's a great contractor and am glad I chose him. He's customer-focused, an expert in his craft, delivers a quality solution with integrity and attention to detail, works hard and cleans up fast. He started promptly Wednesday morning and was gone before I got home from work Thursday. He doesn't forget you after the project completes - he's quick to follow up with answers to any questions and backs up his work. If you have a water problem around your foundation - use AJ Waterproofing to fix it!

Deborah R.
May 2016
5.0
Yes, I recommend this pro
AJ was honest. I expected someone to try to sell me more of a remedy than I needed. AJ told me only what I needed to have done. He was neat, and clean up was beautiful. I would recommend this company.

Licensing

State Contractor License Requirements

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FAQ

A.J. Waterproofing, LLC is currently rated 4.6 overall out of 5.

Yes, A.J. Waterproofing, LLC offers free project estimates.

No, A.J. Waterproofing, LLC does not offer eco-friendly accreditations.

No, A.J. Waterproofing, LLC does not offer emergency services.

No, A.J. Waterproofing, LLC does not offer warranties.