Foundation Crack Injection vs Exterior Excavation Repair in Toronto
Last updated: By Below-Grade Records Desk
Injection is the cheaper repair by an order of magnitude: $300 to $1,500 for one crack, per Nusite Group, Gamcon and DryShield, against $50 to $300 and up per linear foot to excavate, or $5,000 to $20,000 and up for the whole job per DryShield. Excavation earns its price only when the outside of the wall has to be reached anyway.
Once you have picked, WaterproofingIndex's own dataset holds 7 foundation crack injection specialists across the Greater Toronto Area at an average Google rating of 4.78★ over 522 reviews (August 2026), so you can move straight from this verdict to a ranked shortlist of pros who do the work.
WaterproofingIndex reconciles conflicting contractor quotes by widening the range rather than picking a favourite, and reviews every figure before publishing.
Comparison
Crack injection or Exterior excavation: what actually differs?
Every price in this table names the Canadian source that published it, in the cell itself. Rows that carry no price are statements about how the two methods work, not claims about cost.
| Criterion | Crack injection | Exterior excavation |
|---|---|---|
| One crack, typical Toronto quote | $300–$800 (Nusite Group); $400–$800 one-day repair (Gamcon); $750–$1,000 polyurethane and $750–$1,500 epoxy (DryShield) | $50–$300+ per linear ft to expose, repair and waterproof the area (RCC Waterproofing) |
| Whole job | $800–$3,500 for a home needing 1 to 3 cracks repaired (Ontario Foundations) | $5,000–$20,000+ depending on depth and access (DryShield) |
| How it works | Ports are drilled along the crack from inside and resin is injected through the wall thickness. | The wall is dug to the footing from outside, then repaired and waterproofed on the water side. |
| Which resin, and why | Polyurethane expands and stays flexible, priced $400–$800 for a non-structural leaking crack; epoxy sets rigid for a structural crack, $500–$1,200 (Ontario Foundations) | Not applicable. The repair is a membrane on the outside face rather than a fill inside the crack. |
| Wall type | A poured-concrete repair. Resin is injected through the wall along the crack. | Works on the outside face whatever the wall is built from. |
| What else can be done at the same time | Tie-rod holes sealed at $75–$150 each (DryShield); carbon fibre staples added over the crack at $800–$2,500 (Ontario Foundations) | Membrane, drainage board and new weeping tile, since the trench is already open |
| Disruption | Interior only. Nothing outside is touched and Gamcon prices it as a one-day repair. | The ground along the wall is opened to the footing and backfilled afterwards. |
| Season | Year round; interior injection is not weather dependent. | Needs unfrozen ground, so typically April to November. |
| Do-it-yourself option | Materials only: a $89.16 crack prep and injection foam kit at The Home Depot Canada, or a $321.64 Hydra Stop 300 kit for a 10 ft crack on Amazon.ca | None. Excavation to a footing is not a homeowner job. |
Contact
Which basements call for crack injection?
Injection is the default answer for a leaking crack in a poured wall, and the price gap is the reason. Ontario Foundations puts a whole visit covering one to three cracks at $800 to $3,500, which is below the starting point of most exterior quotes for a single wall.
- The wall is poured concrete and the crack is accessible from inside.
- You want it done now. Gamcon prices injection as a one-day repair with no excavation, and it runs through the winter.
- The leak is the problem, not the wall. Polyurethane at $400 to $800 stays flexible in a non-structural crack (Ontario Foundations).
- Tie-rod holes are weeping too, which are sealed alongside at $75 to $150 each (DryShield).
Contact
Which basements call for an exterior excavation repair instead?
Excavation makes sense when the outside of the wall has to be reached for other reasons, because then the crack repair rides along with work you were paying for anyway. On its own it is a large spend: DryShield puts the whole job at $5,000 to $20,000 and up, and Aquatech Waterproofing publishes $15,000 as a starting point.
- The exterior membrane or weeping tile is due, so the trench is justified without the crack.
- The crack has been injected before and is still passing water.
- Exterior crack repair is priced at $150 to $250 and up per linear foot at the crack location (DryShield), so a short scope can stay contained.
- The wall needs parging or face repair that cannot be reached from inside.
Prices
What does each cost on a real project?
Take one leaking vertical crack in a poured basement wall, the most common single-defect call in Toronto. Published quotes for exactly that job:
- Injection, low end of the GTA range
- $300–$800 (Nusite Group)
- Injection, one-day repair, no excavation
- $400–$800 (Gamcon)
- Injection, full interior program with access and prep
- $1,500–$2,200 (Leaquida Waterproofing)
- Exterior dig at the crack, 10 ft of wall at $50–$300+ per linear ft
- $500–$3,000+ (RCC Waterproofing)
- Exterior repair priced as a whole job
- $5,000–$20,000+ (DryShield)
The spread inside the injection column is itself the lesson: the same crack draws $300 and $2,200 from different Toronto firms, so get more than one number before you accept either. Excavation only competes on price when a short, shallow, accessible section is enough, and no GTA source publishes a whole-job exterior figure that undercuts a straightforward injection.
Frequently asked questions
How much does foundation crack injection cost in Toronto?
- Published GTA quotes span $300 to $800 (Nusite Group), $400 to $800 for a one-day repair (Gamcon), $750 to $1,000 for polyurethane and $750 to $1,500 for epoxy (DryShield), and $1,500 to $3,000 (Aquatech Waterproofing). Ontario Foundations puts a whole visit covering one to three cracks at $800 to $3,500. Add 13% HST, and get at least three quotes given that spread.
Should the crack be injected with epoxy or polyurethane?
- Ontario Foundations prices them as different repairs. Polyurethane expands and stays flexible, quoted $400 to $800 for a non-structural crack that is passing water. Epoxy sets rigid and bonds the concrete, quoted $500 to $1,200 for a structural crack. Where a crack needs reinforcement as well, carbon fibre staples are added over the injection at $800 to $2,500.
When is exterior excavation worth it for a crack?
- When the trench is justified by something else. Digging to the footing costs $50 to $300 and up per linear foot to expose, repair and waterproof (RCC Waterproofing), and DryShield puts a whole exterior crack job at $5,000 to $20,000 and up. If the membrane or weeping tile is due anyway, the crack repair is a small addition; if it is not, injection does the same leak for a fraction.
Can I inject a foundation crack myself?
- The materials are sold retail: The Home Depot Canada lists a crack prep paste and injection foam kit at $89.16, and Amazon.ca lists a Hydra Stop 300 system for a 10 foot crack at $321.64. That covers materials only. Injection depends on setting ports and controlling how far resin travels through the wall, and a failed attempt still leaves the professional repair to pay for.
Questions to ask your contractor
- Is this epoxy or polyurethane, and why that one for this crack?
- Is the injection meant to stop water, or to bond the wall structurally? Injecting from inside versus digging outside
- How do you know the crack has stopped moving? Sourced price per crack
- What happens if the same crack leaks again, and for how long is that covered?
- Does the warranty transfer if we sell the house?