How much does basement crack repair cost in Ontario?

For 2026 planning, many injected cracks land around $500–$1,500 each before tax, depending on length, access, and material. Structural repairs or full perimeter drainage are separate scopes—see our cost hub for bands.

Is crack injection enough, or do I need waterproofing?

Injection can stop an isolated active crack in sound poured concrete. Recurring floor–wall joint seepage, failed weeping tile, or multiple wet cracks usually need drainage and sump work—not more injections alone.

When should I call an engineer about a foundation crack?

Wide horizontal cracks, bulging walls, doors that suddenly stick, or stair-step cracks in block often need a structural assessment before cosmetic sealing. Ask contractors whether engineering is required for your crack pattern.

What causes basement foundation cracks in Ontario?

Shrinkage during curing, freeze–thaw, clay shrink–swell, settlement, and hydrostatic pressure are common. Vertical hairline cracks in poured walls are often non-structural; horizontal or widening cracks need a closer look.

Can I repair a basement crack myself?

DIY kits can slow damp hairline cracks, but active flowing leaks and structural cracks usually need professional injection, drainage diagnosis, or engineering. Misapplied epoxy on a moving crack often fails within a season.

Ontario home illustrating water protection from roof leaks through foundation and drainage — Waterproof Ontario.

Basement Crack Repair in Ontario

Match the fix to the crack—injection for active leaks in sound poured walls, engineering when movement is structural, and drainage when weeping tile has failed.

Reviewed by Waterproof Ontario editorial team · Updated August 3, 2026. Figures are planning ranges, not quotes—confirm scope and price in writing with licensed contractors.

When crack repair is the right scope

Waterproof Ontario publishes this guide so homeowners can diagnose and compare contractors—we do not install repairs ourselves. An isolated wet crack in poured concrete often responds to polyurethane or epoxy injection. Recurring seepage at the floor–wall joint, multiple wet cracks after every storm, or a clogged perimeter drain usually needs basement waterproofing (interior drainage and sump) rather than more injections alone.

For budgeting bands and the interactive calculator, see the Ontario waterproofing cost hub. Typical crack injection planning range (2026): $500–$1,500 per crack.

Injection vs drainage vs structural repair

Polyurethane injection — flexible water-stop for active seepage cracks in poured concrete.
Epoxy injection — structural bonding when the wall is otherwise sound and movement has stopped.
Interior drainage + sump — when water enters along the footing or multiple paths, not one crack.
Engineering / wall repair — horizontal cracks, bulging block, or progressive widening before any cosmetic seal.

Related problem guides: basement leak repair, wet basement repair, and foundation waterproofing cost.

Find crack repair contractors by city

Start on a city guide for local soils and cost context, then browse the Ontario contractor directory.

Toronto Mississauga Vaughan Markham Oakville Hamilton Scarborough Etobicoke North York Kitchener Windsor Ottawa

Frequently asked questions — basement crack repair

Choosing basement crack repair scopes in Ontario

Not every crack needs the same fix. Hairline shrinkage, active seepage, and structural movement require different materials and warranties.

Ask whether the crack is active (wet) or dormant, and how they tested it.
Epoxy vs polyurethane: structural bonding vs flexible water-stop—quotes should name which and why.
Horizontal or stair-step cracks in block walls may need engineering before injection.
Compare labour warranty separately from material warranty; ask what voids coverage.

See the full 2026 Ontario cost hub for roof-to-foundation bands, basement city ranges, and the basement calculator.

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Request written scopes that name the crack type, material, and warranty—then sanity-check prices against the cost hub.

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