Interior Basement Waterproofing in Toronto & GTA
a Dry Basement Without Excavation
If you're dealing with leaks, damp walls, or musty smells but can't dig outside due to tight space, concrete, or cost interior waterproofing is your answer. At DrainPro Plumbing & Drain Services Inc., we specialize in interior basement waterproofing systems that stop leaks from the inside and keep your home dry, clean, and mold-free. We serve homes across Toronto, Mississauga, Brampton, Vaughan, Markham, Richmond Hill, Scarborough, Etobicoke, Pickering, and the entire GTA.
24/7 Emergency Service
Fully Licensed & Insured
Guaranteed Satisfaction
Rated 5 Stars by Homeowners
What Is Interior Waterproofing?
Interior waterproofing is a non-invasive system that controls water after it enters through foundation walls or floors and redirects it safely away from your basement. We remove a narrow strip of concrete along the wall, install a drainage channel and waterproof membrane, and connect it to a sump pump system that actively moves water out of the home.
It’s ideal when:
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You can’t excavate due to limited space or access
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You’re in a semi-detached, row house, or tight urban lot
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You're on a budget, or need a fast, clean solution
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You’ve already experienced flooding or mold
Interior waterproofing can be done year-round and causes minimal disruption to your home.
Signs You Might Need Interior Waterproofing
Water coming in through floor-wall joints
Moldy smells or visible mildew on baseboards
Leaks during heavy rain
Damp or crumbling drywall in the basement
Foundation walls that “sweat” or show white deposits
Sump pump working constantly without results
What We Install
Our custom interior waterproofing systems include
Waterproof Membrane: Applied to the inside wall to block and guide water toward drainage.
Drainage Channel: A perforated pipe or delta system installed below the floor slab along the leaking wall.
Sump Pump System: We install or upgrade your sump pit with a powerful pump, backflow valve, and optional battery backup.
Concrete Restoration: Once the system is in place, we re-pour and level the floor with fresh concrete.
Our Interior Waterproofing Process
At DrainPro, we make sure every interior waterproofing job is done professionally, cleanly, and with full transparency. Here’s exactly how the process works from start to finish
1. Basement Inspection
We identify where water is entering and explain the best solution clearly, with no pressure.
2. Preparing the Work Area
Floors and nearby areas are covered. We keep dust and mess contained from start to finish.
3. Breaking the Concrete
A narrow strip of floor is removed along the wall to reach the base of the foundation.
4. Installing the Drainage System
A gravel bed and perforated pipe are placed to catch and redirect water to the sump.
5. Applying the Waterproof Membrane
We install a barrier on the wall to block moisture and guide it down into the drain.
6. Connecting to the Sump Pump
The system connects to your existing sump pump or we install a new one with backup.
7. Concrete Re-Pour
We restore the floor with fresh concrete, leaving it smooth and ready to finish.
8. Final Clean-Up & Walkthrough
Everything is cleaned and reviewed. We explain how your system works and provide your warranty.
Every step is done by our in-house team of licensed waterproofing specialists, not subcontractors.
Why Choose DrainPro?
At DrainPro, we bring a reputation built on trust, efficiency, and long-lasting results.
Here’s why homeowners across Toronto, Mississauga, Vaughan, and the entire GTA rely on our drain expertise
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Full Foundation Knowledge
We don’t just waterproof, we understand how drains, sewer systems, and grading affect your whole property.
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Real Results, Real Time
We provide before and after photos of the entire process, so you know what was done underground.
Jobs Done Right & On Time
Most exterior waterproofing jobs are completed in 2–4 days with proper cleanup and full restoration.
Honest, Flat-Rate Pricing
You’ll always know what to expect. No hidden fees, no surprise hourly billing just honest, upfront quotes for every job.
Warranty You Can Trust
Most full-depth exterior waterproofing jobs come with 10–25 year warranties, depending on the job scope.
Experienced, Licensed & Insured
All DrainPro techs are certified, insured, and undergo continuous training delivering the highest standards in safety and workmanship.
Customer Reviews
Veronica D. – Scarborough, ON
"We had water seeping through a floor joint under the stairs. Mike from DrainPro explained the situation clearly and didn’t try to push exterior waterproofing like the last company did. They installed an interior drain channel and membrane system, and connected it to our existing sump. Clean job, fair price, and they were in and out in one day."
Manny J. – Vaughan, ON
"Our finished basement got soaked after a summer storm. Oleksandr walked us through the interior waterproofing process, which included breaking a strip of the floor and adding a new sump pump with battery backup. The crew covered everything in plastic, cleaned up properly, and even reinstalled the baseboards. It’s been totally dry ever since."
Sarah N. – Mississauga, ON
"Had water coming in during snow melts. Igor diagnosed the issue with a thermal camera and recommended interior waterproofing along two walls. The price was very reasonable and they didn’t waste time. They were in, did the work, poured concrete back, and left it clean. Solid work."
Kyle F. – Toronto, ON
"We’re in a semi-detached in downtown Toronto with no way to excavate. DrainPro installed a full interior drainage system and new sump pump in our basement. They were quick, respectful of the home, and explained every step. One of the better experiences we’ve had with contractors."
Frequently Asked Questions
Don’t let leaks turn into damage. Call DrainPro today for a no-pressure, expert assessment and take the first step toward a dry, healthy basement.