Leaking Basement Repair Cost in Ontario (2026)
The price of fixing a leaking basement depends almost entirely on where the water gets in. Sealing one crack and waterproofing a whole basement are different jobs, with prices thousands of dollars apart.
Leak repair costPage 22
How much does it cost to fix a leaking basement? In Ontario, sealing one leaking crack from inside typically costs $500 to $1,500. Repairing one crack from outside runs $3,000 to $5,500. A full interior waterproofing system for an average basement is roughly $10,000 to $32,000, and exterior waterproofing roughly $14,000 to $42,000.
Below: prices by leak source, what moves a quote up or down, what you can fix for almost nothing, and how to get an accurate price.
Basement leak repair prices by source
| Where the water gets in | Usual fix | Typical price | Source |
|---|---|---|---|
| One crack in a poured wall | Crack injection from inside | $500 – $1,500 per crack | HomeStars; viewhomes.ca (2026) |
| One crack that needs outside access | Exterior crack repair | $3,000 – $5,500 per crack | viewhomes.ca (2026) |
| Failed weeping tile | Foundation drain replacement | $100 – $250 per linear foot | renoquotes.com (2026) |
| Wall-floor joint, all around | Interior waterproofing system | $70 – $230 per linear foot | HomeStars |
| Seepage through the walls | Exterior waterproofing | $100 – $300 per linear foot | HomeStars |
| A flooding window well | Drain clean-out or new drain | Quoted on site | No reliable Ontario figure published |
| Brampton Foundation Crack Repair | — | Crack $750 – $1,000, tie-rod hole $150, interior from $85/ft for trench and concrete (drain, membrane and pump extra), exterior from $120/ft for backfill and regrading (digging, membrane and weeping tile extra), plus HST | Our price |
These are ranges from published guides, not quotes. A real price depends on your basement.
What changes the price?
- The leak source. This matters most. One crack is a few hours of work; a full perimeter system is days.
- How much wall is involved. Waterproofing is priced by the linear foot, so one wall costs far less than four.
- A finished basement. Drywall, framing and flooring along the walls have to come off and go back on. Ask whether that's included.
- What's outside. Decks, driveways, interlock and gardens along the wall add cost to any exterior work.
- Wall type. Poured concrete can be injected; concrete block usually needs a different fix.
What can you fix for almost nothing?
Before paying for any repair, rule out the free fixes:
- Extend downspouts so they empty well away from the house.
- Regrade soil so it slopes away from the foundation.
- Clean eavestroughs so they don't overflow against the wall.
- Clear leaves out of window wells.
If water still comes in after a heavy rain, it's coming through the foundation. See basement leak repair for how each source is fixed.
Will insurance pay for it?
Usually not when water seeps in gradually through the foundation. Sewer backup and overland flooding are often separate add-ons to a policy. For homes under two years old, the Tarion warranty covers water coming through basement or foundation walls, so call your builder first.
How do you get an accurate quote?
Send us:
- A photo of where the water first appears, taken right after rain
- How often it happens (every rain, only in spring, only in big storms)
- Whether the basement is finished
- How old the house is, and whether you have a sump pump
For full-system prices, read basement waterproofing cost.