Permanent waterproofing and foundation repair—fixed right the first time in London & area.
Wet basement? Foundation crack? Drainage problem? A1 Waterproofing installs proven interior and exterior waterproofing systems built to last.

A1 Waterproofing is built on a simple promise: we fix it once, and we fix it right. From interior and exterior waterproofing to complete foundation repair, our team brings the skill and discipline to stop leaks and restore strength to your home. Backed by proven systems and a no-shortcuts approach, we deliver permanent solutions homeowners can count on.
A1 Waterproofing is built on a simple promise: we fix it once, and we fix it right. From interior and exterior waterproofing to complete foundation repair, our team delivers permanent solutions homeowners can count on.
Get Free EstimateBasement waterproofing is one of the most important repairs and a must-do if you want to guarantee your basement stays waterproof.
Commercial waterproofing requires precision and long-term performance. We work with property managers, contractors, and developers to protect buildings from water damage and prevent costly repairs.
Proper drainage is critical to preventing water buildup and protecting your property. We provide reliable drainage systems designed to redirect water away from foundations and eliminate moisture issues at the source.
A1 Waterproofing is Canadian owned family operated company that has been waterproofing homes throughout London & surrounding for 14 years. At the forefront of our operation is our team of professionals; that share the same commitment to excellence and dedication to providing you, our customer the best value on your investment.
A1s reputation as a trustworthy and reliable basement waterproofing & foundation repair contractor reflects our dedication to these core values
This isnt just something we do, its something we believe in.
When quoting an exterior waterproofing repair there are many factors to consider when pricing takes place.
Things such as proximity to other homes or obstacles, underground services such as gas or hydro & soil type to mention a few.
On average a homeowner should expect to pay between $75 – $125 a linear foot for exterior waterproofing.
Interior waterproofing is cheaper and sometimes less evasive but unlike exterior waterproofing, which prevents water from coming in contact with the foundation it acts as a corrective method that manages water that has already entered a basement.
Cost typically range between $60 and $100 per linear foot.
When we repair foundation cracks, we don’t mess around, upholding a rigorous standard of quality in our crack repair services. Whether performed by hand on the exterior of the home or done from the inside, we guarantee results or your repair cost is fully refunded.
Interior Vertical Crack Repairs range from $600 – $800
Exterior Vertical Crack Repairs range from: Contact us for options & pricing.
The size and type of drain, where it will be install as well as the obstacles that may be encountered determine the cost.
You can expect to pay from $50 – $100 linear foot.
At A1 we understand that water can wreak havoc in a short amount of time and thats why if your issue is urgent we work extra hard to provide solutions within 48hrs
A1 is so dedicated to providing their customers with the very best service we won’t ask for any form of payment until your satisfied with the work completed
We are so confident with our quality of workmanship that we wont ask you for payment until your satisfied with the work completed.
At A1 we understand that water can wreak havoc in a short amount of time and thats why if your issue is urgent we work extra hard to provide solutions within 48hrs.
A1 is so dedicated to providing their customers with the very best service we won’t ask for any form of payment until your satisfied with the work completed
You can rest assured that we are so confident with our quality of workmanship that we wont ask you for payment until your satisfied with the work completed.
Trustindex verifies that the original source of the review is Google. Words cannot express the gratitude that I feel for this company. Not only did they provide a very detailed and fair quote, but their communication and response time were exceptional from the very beginning. The work that was to be done today was fixing two cracks in our foundation One was done from the inside the other was gonna be done from the outside that was seeping water in into our basement, putting a camera through our Sump pump to check the weeping tile for clogs and to dig out one of our window wells and fix the crack and install a new drain. Meeting the team for the first time today only confirmed that we had made the right choice. The guys were Anthony, Eric, and Newton, meeting them we knew we had made the right decision. The guys worked incredibly hard from 7:30 a.m. until 5:30 p.m. with stopping only for lunch. They dug out our window well by hand because they knew that bringing machinery into our backyard would have ruined the landscaping. That level of care and compassion meant a lot to us. The crew was professional, respectful, hardworking, and even shared a few laughs with us throughout the day because as a customer I was quite funny. I was so appreciative of their dedication that I gave them each $20 for lunch as a small thank you for all their hard work. I highly recommend this company. You will definitely not be disappointed.Posted on Google Julie SilcockTrustindex verifies that the original source of the review is Google. Posted on Google Jeff WarnerTrustindex verifies that the original source of the review is Google. I really appreciate your quick response! Anthony was there when I needed him. And very knowledgeable.Posted on Google Cathy WissonTrustindex verifies that the original source of the review is Google. The workers dis a great job on our foundation, we’re very careful with our landscaping and did a great clean up afterwards. Highly recommend this companyPosted on Google Kim PatrickTrustindex verifies that the original source of the review is Google. So fast and professional. The prices were so affordable. Customer service outstanding. Thank you see you again if I crack again....Posted on Google Sue BeauneTrustindex verifies that the original source of the review is Google. Very professional and know what they're doing when dealing with your basement. They do great work we would highly recommend them.Posted on Google John “G40STI” KatsTrustindex verifies that the original source of the review is Google. Suggested a good solution and a better price.Posted on Google RachelleTrustindex verifies that the original source of the review is Google. Posted on Google Rachelle D'SouzaGoogle rating score: 4.6 of 5, based on 8 reviews