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Fast, permanent solutions for basement leaks — from minor seepage to major water intrusion.
A leaky basement is one of the most urgent problems a Toronto homeowner can face, and we've repaired thousands of them over our 20+ years in the waterproofing industry. The first thing we want homeowners to understand is that basement leaks do not fix themselves — they only get worse. Water is incredibly persistent, and once it finds a path into your basement, that path will widen over time as water erodes concrete, dissolves mortar, and exploits every weakness in your foundation. The sooner you address a leak, the simpler and less expensive the repair.
Why Choose Us
The most common type of basement leak we see in Toronto is foundation crack seepage. Poured concrete foundations — standard in homes built from the 1960s onward — develop shrinkage cracks as the concrete cures, and over time, Toronto's freeze-thaw cycles and clay soil pressure widen these cracks until water pushes through. We repair these with low-pressure crack injection using either structural epoxy or expanding polyurethane resin. Epoxy creates a bond stronger than the original concrete and is our choice for structural cracks. Polyurethane expands 10 to 20 times its volume to fill voids and remains flexible, making it ideal for cracks that may still experience slight movement from thermal expansion. Both materials fill the crack from front to back — from the interior surface through to the soil side — providing a complete, permanent seal.
Don't Ignore the Signs
The second most common leak source in Toronto basements is cove joint seepage — water entering where the basement floor meets the wall. This joint is not a crack; it is a natural cold joint where the floor slab was poured against the already-cured wall. In homes with failed or non-existent weeping tile, hydrostatic pressure forces water up through this joint, often appearing as a dark wet line along the entire perimeter. The fix is an interior perimeter drainage system: we trench along the wall-floor joint, install perforated pipe in a gravel bed sloped to a sump pit, and pour new concrete over the top. This intercepts the water before it surfaces and channels it to the pump.
For older Toronto homes — particularly the 1950s cinder block and concrete block construction common in Scarborough, East York, and parts of Etobicoke — leaks often appear as weeping from mortar joints at multiple points along the wall. Block foundations are essentially hollow, and water fills the cores from the top down, eventually seeping out at the weakest mortar joints. Surface sealers and hydraulic cement patches are temporary at best. The proper repair involves installing weep holes at the base of each block core to drain trapped water into an interior perimeter drainage system, then covering the wall with a dimpled drainage membrane that directs any future seepage to the drain rather than your floor.
We also see seasonal leaks caused by window well flooding, particularly in spring when snow piled against the house melts faster than the frozen soil can absorb it. Improperly drained window wells act like bathtubs against your basement windows, and the water eventually finds its way past the window seal. The fix involves cleaning or replacing the window well drain, ensuring it connects to the weeping tile, and installing a clear polycarbonate cover to keep rain and snow out while still allowing light in. Every leak has a cause, and every cause has a permanent solution — that is our approach on every job. We never recommend band-aid fixes because they waste your money and leave the real problem to get worse.
Materials & Methods
Expanding polyurethane resin injected into foundation cracks at low pressure through surface-mounted ports. The resin expands 10-20x to fill the full crack depth and any surrounding voids, remains flexible to accommodate thermal movement, and cures in minutes to stop active leaks immediately.
Two-part structural epoxy resin injected through ports at measured intervals along the crack. Fills the full depth from interior face to soil side, cures to a bond strength exceeding the original concrete (7,000+ PSI), and restores structural integrity for cracks with width exceeding 1/16 inch.
Trench cut along the wall-floor joint, fitted with 4-inch perforated PVC pipe in a gravel bed sloped to the sump pit. A controlled gap at the cove joint intercepts hydrostatic seepage and directs it to the drain before it reaches the floor surface. New concrete poured to restore the floor.
Excavation and cleaning or replacement of the window well drain connection to the weeping tile. New 3/4-inch clear gravel fill in the window well base, proper grading around the well perimeter, and installation of a clear polycarbonate window well cover to prevent surface water entry.
Our Process
We trace the leak to its exact source using proven diagnostic techniques.
We explain the cause, recommend solutions, and provide a transparent quote before any work begins.
Our technicians apply the appropriate repair method — injection, membrane, drainage, or combination.
We verify the repair, clean up, and provide warranty documentation for your records.
Transparent Pricing
Honest pricing with no hidden fees. Every quote is customized to your specific needs.
| Service | Price Range |
|---|---|
| Single crack repair | $400 – $800 |
| Multiple crack repairs | $1,000 – $3,000 |
| Wall seepage repair | $2,000 – $6,000 |
| Complete leak remediation | $4,000 – $12,000 |
Prices vary by project scope. Get an accurate quote with a free inspection.
Get Your Free QuoteClient Reviews
“Outstanding job! My basement is finally dry thanks to your team. No more musty smell or moisture problems. A+ service!”
“From the initial appointment to final inspection, service was exceptional. Prompt, professional, and results exceeded expectations.”
“Professional and friendly staff. They solved our leaky basement in no time. The results were fantastic. Basement has been leak-free since the work was done.”
Experience & Expertise
Related Solutions
Expert foundation crack repair using advanced injection techniques to permanently seal and stabilize cracks.
Learn More →Seals your basement walls and floors from the inside to stop water infiltration and prevent moisture damage.
Learn More →Professional window well installation for basement drainage, natural light, and egress code compliance.
Learn More →Service Areas
We provide leaky basement repair throughout Toronto and the Greater Toronto Area.
Common Questions
