A.J. Waterproofing

4.83 | 9 Verified Ratings
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3774 Kratz Road
Collegeville, PA 19426
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A.J. Waterproofing

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.


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Service Area

  • Norristown
  • Valley Forge
  • Chester
  • Wayne
  • North Wales
  • West Chester
  • Fort Washington
  • Eagleville
  • Harleysville
  • Southeastern
  • Media
  • Marcus Hook
  • Blue Bell
  • Downingtown
  • Audubon
  • Pottstown
  • Exton
  • Collegeville
  • Doylestown
  • Phoenixville
  • Conshohocken
  • Garnet Valley
  • Spring House
  • Telford
  • Souderton
  • Chalfont
  • Wyncote
  • Narberth
  • Kennett Square
  • Colmar
  • New Hope
  • Coatesville
  • Thorndale
  • West Point
  • Villanova
  • Paoli
  • Newtown
  • Philadelphia
  • Schwenksville
  • Worcester
  • Aston
  • Wallingford
  • Broomall
  • Hatfield
  • Dresher
  • Cheltenham
  • Oreland
  • Glen Mills
  • Merion Station
  • Skippack
  • Chadds Ford
  • Glenside
  • Elkins Park
  • Springfield
  • Fairview Village
  • East Greenville
  • Bryn Mawr
  • Chester Springs
  • Buckingham
  • Sellersville
  • Spring City
  • Franconia
  • Jenkintown
  • Devon
  • Malvern
  • Hilltown
  • Huntingdon Valley
  • Gwynedd Valley
  • Prospect Park
  • Thornton
  • Lansdale
  • Hatboro
  • Havertown
  • Newtown Square
  • Swarthmore
  • Gilbertsville
  • Clifton Heights
  • Horsham
  • Lansdowne
  • Ridley Park
  • Pennsburg
  • Abington
  • Quakertown
  • Glenolden
  • Haverford
  • King of Prussia
  • Royersford
  • Brookhaven
  • Upper Darby
  • Lafayette Hill
  • Perkiomenville
  • Perkasie
  • Ambler
  • Plymouth Meeting
  • Montgomeryville
  • Ardmore
  • Salfordville
  • Drexel Hill
  • Willow Grove
  • Essington
  • See All >

Services Offered


Areas of Expertise

  • Waterproofing

Quick Facts

Business Hours
(Please call to confirm)
  • Warranty Offered
  • Free Estimates
  • Warranty Description: Life time


In Business Since: 1976
State Licensing
Trade: Home Improvement Contractor
License #: PA054659
Expiration: 01-24-2020
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Ratings & Reviews
A.J. Waterproofing

Real feedback from real homeowners.
Learn more about this pro by reading the ratings and reviews below.
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Showing 1-9 of 9
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5.0   |  
Review by in Royersford, PA
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.
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4.33   |  
Review by in Aldan Pa, PA
They were very professional and efficient!
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5.0   |  
Review by in Hatboro, PA
Quick service. Provided multiple options that would fit my budget.
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5.0   |  
Review by in Pottstown, PA
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.
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5.0   |  
You're lucky if you get them.
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5.0   |  
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!
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4.0   |  
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.
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5.0   |  
Review by in Downingtown, PA
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!

2 of 2 users found this review helpful.

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5.0   |  
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.

2 of 2 users found this review helpful.

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