What it costs in the GTA
| Job | Typical range |
|---|---|
| Interior crack injection (polyurethane or epoxy) | $500–$1,500 per crack |
| Single cosmetic crack, GTA | $600–$900 |
| Several cracks | $2,500–$4,500 |
| Structural repair or underpinning | $10,000+ |
Before HST. Finished basements cost more because drywall has to come off and go back. Ranges where published GTA and Ontario sources overlap, checked November 2026. Not a quote.
Rebates, permits & rules
- Structural repairs (bowing walls, settling, underpinning) need a building permit and usually an engineer's drawings.
- A non-structural leaking crack doesn't need an engineer. A widening or stepped crack does.
- Signed the contract at your home? Ontario gives you 10 days to cancel most contracts signed there, for any reason.
What a complete quote includes
If any of these aren't on your quote, ask. Missing doesn't mean it's wrong, but it should be in writing.
- Number and location of cracks
- Method: polyurethane or epoxy injection, or exterior repair
- Whether the crack is structural, and who decided that
- Engineer's report, if structural
- Warranty per crack, and whether it transfers
- Drywall or finish removal and repair
- Cleanup
Watch out for
- A full waterproofing system sold to fix one crack
- 'Structural' with no engineer involved
- Warranty that doesn't say what happens if the crack leaks again
- No crack count or locations
Cosmetic or structural?
- Thin vertical cracks in poured concrete are common and usually just need sealing if they leak.
- Cracks wider than about 6 mm, stair-step cracks in block walls, or walls bowing inward: call a structural engineer first.
- Doors sticking and floors sloping along with the crack is a sign of movement.
- Mark the ends of a crack with a pencil and date. If it grows, get it assessed.
5 questions to ask before you sign
- Is this crack structural? What tells you that?
- Polyurethane or epoxy, and why for this crack?
- What happens if it leaks again? Is the warranty in writing?
- Does the warranty transfer if I sell?
- Should an engineer look at this before you repair it?
Ask AI first
Paste your quote into ChatGPT, Claude or Gemini with this prompt:
I'm a homeowner in [city], Ontario. Here is my foundation repair quote: [paste]. List what it includes and leaves out (number of cracks, method, structural assessment, warranty, finishing repairs), work out the price per crack, flag anything vague, and give me 5 questions to ask before I sign. Don't guess a fair price.
Or skip the copy-paste: our free Quote Checker already knows what a foundation repair quote should include, and compares the price with real GTA ranges.
Common questions
How much does it cost to fix a foundation crack?
An interior injection typically costs about $500–$1,500 per crack in Canada.
Are foundation cracks normal?
Thin vertical cracks in poured concrete are common. Wide, stair-step or growing cracks need an engineer's look.
Do I need an engineer for a foundation crack?
Not for a typical leaking hairline crack. Yes if the crack is wide, growing, or the wall is moving.