What is the price of foundation crack injection repair in a Toronto home?

Foundation crack injection in a Toronto home typically costs between $300 and $800 per crack, with most GTA waterproofing contractors charging a minimum service fee of $400 to $500 regardless of how many cracks are repaired. This makes it one of the most affordable and effective waterproofing repairs available, particularly for poured concrete foundations that develop hairline to moderate cracks as the house settles and the concrete cures over time.

Two injection materials are commonly used, and understanding the difference helps you make the right choice. Polyurethane injection is the more popular option for residential waterproofing in the GTA, costing $300 to $600 per crack. Polyurethane expands as it cures, filling the full depth and width of the crack including any irregular voids. It remains flexible after curing, which is a significant advantage in Toronto's climate — our 50-plus freeze-thaw cycles per year cause constant foundation movement, and a rigid repair material can crack again where a flexible one moves with the wall. Epoxy injection costs $400 to $800 per crack and creates a structural bond that's actually stronger than the surrounding concrete. Epoxy is the right choice when the crack has compromised the wall's structural integrity and you need to restore strength, but it's rigid and may crack alongside the original repair if the foundation continues to move.

The repair process involves cleaning the crack, installing injection ports at intervals along its length, sealing the surface between ports, and then injecting the material under pressure from the lowest port upward until it fills the entire crack from interior to exterior face. A skilled technician can complete a single crack in about an hour, and most GTA contractors can handle multiple cracks in a single visit. The repair can be done in any weather since it's performed from the interior, making it a year-round service.

When crack injection is the right solution — and when it isn't — matters enormously. Vertical or diagonal hairline cracks in poured concrete walls are ideal candidates for injection. These cracks are almost always caused by concrete shrinkage during curing or minor settlement, and they're structural non-issues that simply need to be sealed against water entry. However, horizontal cracks, particularly those bowing inward, indicate lateral pressure from soil — often the expansive clay soils found throughout Scarborough, North York, Mississauga, and Brampton — and may require structural reinforcement with carbon fibre straps ($500 to $800 per strap) or steel I-beams in addition to crack sealing. Stair-step cracks in concrete block walls suggest foundation movement that should be evaluated by a structural engineer ($500 to $1,500 for an assessment) before any cosmetic repair.

Most reputable GTA waterproofing contractors offer warranties of 15 to 25 years on crack injection work, and some offer lifetime transferable warranties. Always get the warranty terms in writing, confirm what's covered (reinjection only, or including any interior damage from a failed repair), and verify the company has been in business long enough to honour it. If you're planning a basement finishing project, address every visible crack before any framing goes up — a $500 repair behind a finished wall becomes a $3,000 problem once you factor in demolition and restoration of drywall, insulation, and flooring.