Foundation crack repair cost in Ontario runs from about $500 for a single interior injection to $8,000 for carbon fibre wall reinforcement, and up to $25,000 when exterior excavation uncovers footing damage. The method decides the price more than the crack itself does. A dry, stable hairline crack usually needs only injection. A wide, leaking, or moving crack often needs excavation, drainage repair, or bracing. This guide breaks the cost down by method for Toronto, Vaughan, and Ottawa, and says when the cheap fix is enough.
What drives the price up
Crack width and length
A hairline crack under 1/16 inch takes less resin and less contractor time than a crack that runs the full height of a wall. Contractors price injection by the port, and a longer crack needs more ports.
Whether the crack is active
A crack that is actively leaking during or after rain needs a flexible polyurethane resin that can expand and chase moisture. A dry structural crack can take a rigid epoxy instead. Epoxy injection tends to cost more per crack than polyurethane because the surface prep and port spacing are more exacting.
Wall movement
A vertical crack that has not moved is a different job from a horizontal or stepped crack on a wall that is bowing inward. Movement means the wall is under lateral pressure, not just cracked, and injection alone will not stop that pressure from reopening the crack later.
Access and finishes
A crack behind a finished basement wall costs more to reach, because the contractor has to open drywall or a framed wall first and patch it after. An unfinished basement with the crack in plain sight is the cheapest scenario for injection.
Soil and climate
Toronto and Vaughan sit on clay-heavy soil in many neighbourhoods. Clay swells when it absorbs water from rain or snowmelt and presses outward on basement walls, then shrinks back as it dries. Ottawa’s soil is also predominantly clay, and the same wet-swell, dry-shrink cycle applies there. In both regions, winter freeze-thaw cycles add repeated pressure as water trapped in the soil near the foundation freezes and expands. This cyclical pressure is why a crack that looked stable in summer can widen by spring, and why a contractor may recommend exterior drainage work alongside a crack repair rather than injection on its own.
Cost by repair method
| Method | Typical cost per crack (CAD) | Best suited to |
|---|---|---|
| Polyurethane injection | $500 to $900 | Active leak, hairline to medium crack, wall not moving |
| Epoxy injection | $700 to $1,200 | Dry structural crack, no active leak |
| Carbon fibre straps | $3,000 to $8,000 installed | Bowing wall, needs to stop further inward movement |
| Exterior excavation and membrane patch | $3,000 to $8,500 | Crack tied to a failed exterior membrane, no interior access, or several cracks in one wall section |
| Excavation plus footing repair | $8,000 to $25,000 | Excavation reveals footing damage beyond the crack itself |
These are typical ranges reported by Ontario foundation contractors, not quotes. Get a written, itemized quote before work starts. Foundation Repair Cost Ontario 2026 has a fuller breakdown of the excavation and carbon fibre figures above.
Polyurethane and epoxy injection
This is interior work. A contractor drills small ports along the crack, injects resin under pressure, and seals the surface. Most jobs finish in half a day per crack. Because there is no digging, this is the entry point for most homeowners and the reason injection accounts for the bulk of foundation crack repairs sold in Ontario.
Carbon fibre straps
Straps are epoxied to the wall and anchored to the floor joist above and the slab below, creating a tension member that resists the wall moving further inward. They are usually paired with an injection to seal the crack itself. Straps do not straighten a wall that has already bowed; they hold it where it is.
Exterior excavation
A crew digs down to the footing along the outside of the wall, cleans and repairs the crack from the outside, and often installs or replaces a waterproofing membrane and drainage board before backfilling. This is more expensive because of the labour in digging, backfilling, and restoring the yard, not because the crack repair itself is harder. A narrow side yard, mature landscaping, or a deck built over the dig area all add cost.
When the cheap fix is enough
Interior injection is a reasonable, durable fix when the crack is not actively growing, the wall shows no bowing or stepping, and the leak (if any) is limited to that one crack rather than seepage along the whole wall-floor joint. Many injected cracks hold for the life of the house.
When to spend more
Excavation or carbon fibre is the better call when the wall is visibly bowed, when the same wall has several cracks rather than one, when water is entering along a wide area rather than a single line, or when a home inspection flagged structural movement rather than a cosmetic crack. Patching a moving wall with injection alone usually means paying for the same repair twice.
What our boards show for Toronto, Vaughan, and Ottawa
Georgian Bay Pros ranks companies by Google rating and review count, as a directory, not as a referrer that vets or endorses any one company. As of the September 2026 data month:
The board for foundation repair companies in Toronto lists 20 companies. The median rating is 5.0 and the median review count is 76, with total reviews across the board at 5,345. Three of the 20 companies have fewer than 20 reviews, so most listings have a reasonable review base to judge from.
The board for foundation repair companies in Vaughan also lists 20 companies, with a median rating of 4.95 and a median review count of 57.5. Eight of the 20 have fewer than 20 reviews, roughly double the share seen in Toronto, so it is worth checking review counts individually before assuming a high star rating reflects a large sample.
Ottawa does not yet have a dedicated foundation repair board in our data. The closest match is basement waterproofing companies in Ottawa, which lists 20 companies with a median rating of 5.0 and a median review count of 56. Several companies on that board, including firms with “foundation” in their name, do crack repair and foundation work alongside waterproofing, which is common in a market where the same crew handles both.
A high review count is not proof of quality, but a company with a low review count is a smaller sample to judge from. Read a handful of recent reviews rather than the star rating alone, on any board.
Getting more than one quote
Because injection, carbon fibre, and excavation solve different problems at very different price points, get at least two assessments before choosing a method, especially if a contractor recommends excavation for a crack that looks stable and dry. The foundation repair trade hub lists the vertical across every town in our directory if you want to compare boards in nearby markets.
A note on city subsidy programs
The City of Toronto runs a Basement Flooding Protection Subsidy Program that pays toward a home plumbing assessment, backwater valves, sump pumps, and foundation drain severance and capping. It does not cover crack injection, carbon fibre reinforcement, or exterior waterproofing membrane work, so budget for crack repair separately from any subsidy application.
Frequently asked questions
How much does it cost to fix a foundation crack in Ontario?
A single interior injection typically costs $500 to $1,200. Carbon fibre reinforcement for a bowing wall runs $3,000 to $8,000. Exterior excavation starts around $3,000 per crack and can reach $25,000 if the dig finds footing damage.
What is the cheapest way to fix a foundation crack?
Interior polyurethane or epoxy injection is the cheapest method, because it needs no digging and no drywall demolition beyond the crack itself. It works on dry or actively leaking cracks that are not moving.
When do I need excavation instead of injection?
Excavation is usually needed when the crack is wide, runs with several others, sits below grade with no interior access, or when water is tracking in from a failed exterior membrane rather than through the crack alone.
Do carbon fibre straps stop a foundation wall from moving?
Carbon fibre straps hold a bowed wall in its current position and resist further inward movement. They do not push the wall back to plumb. A wall bowed more than about one inch usually needs a different method.
Does Toronto’s basement flooding subsidy cover crack repair?
No. The City of Toronto’s Basement Flooding Protection Subsidy Program pays toward backwater valves, sump pumps, and foundation drain capping. It does not cover crack injection, carbon fibre, or waterproofing work.