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.