Can a leaking foundation crack be injected from inside in Ottawa?

Yes, foundation cracks in Ottawa can be injected from inside the basement. Published 2025–26 Ontario contractor pricing puts crack injection at roughly $500 to $1,500 per crack, with one Ottawa source quoting from about $300 for epoxy work.

The Ottawa-area price pages list two injection materials: epoxy and polyurethane. What drives the price and which material a contractor proposes are things to ask about directly, because the choice turns on the condition of the crack and what the contractor finds when they look at it. Neither this site nor the Code can tell you which one suits your wall.

A fair quote for crack injection should spell out a few things in writing:

• which material will be used and why
• what the warranty covers, for how long, and whether it transfers to a buyer

Interior injection does not involve excavation, so no locate request is needed for this work. The City of Ottawa's exempt list names "damp proofing of existing basements" as work that does not need a building permit, but crack injection is not named on either the exempt or the permit list. Ask the City's Building Code Services whether a permit is required before the work starts.

One thing worth knowing: the City lists ways water gets into a basement, and a crack in a wall is one path. But the City also notes that protective plumbing devices, such as sump pumps and backwater valves, will not stop water entering through cracks. Ask the contractor who looks at the wall whether injection alone is the right scope for your basement.

Before you agree to any price, ask the contractor to explain in plain language what they expect to find once they start, and what happens to the quote if the crack turns out to be wider or deeper than it looks from inside.