Basement Leak Repair in Ontario, Canada
Professional solutions for basement leaks, water seepage, and foundation water problems. Fast response, permanent repairs.
Reviewed by Waterproof Ontario editorial team · — prices in CAD. Figures are planning ranges, not quotes—confirm scope and price in writing with licensed contractors.
Basement leak repair in Ontario, Canada, in 2026, is commonly $300–$800 CAD per crack for injection, $5,000–$12,000 CAD for interior drainage with a sump, and $10,000–$25,000 CAD for an exterior dig. Injection covers the crack only. Drainage totals cover pipe, stone, and the pump, before tax. Permits and finished-floor repairs are usually extra. Compare contractors in the directory.
Prices in CAD. See the full 2026 Ontario cost hub for roof-to-foundation bands, basement city ranges, and the basement calculator.
Basement leak repair cost (2026)
Planning ranges in CAD, before tax: crack injection often $300–$800 per crack; window-well drains $500–$1,500 per well; interior drainage with sump commonly $5,000–$12,000; exterior excavation and membrane work $10,000–$25,000+. Use the Ontario cost hub and calculator to sanity-check quotes, and see basement crack repair when the failure is an isolated active crack.
Compare contractors in the Ontario directory—request written scopes for the same water path.
Common Basement Leak Locations
Wall Cracks
Vertical or horizontal cracks allowing water seepage through foundation walls
Floor-Wall Joint
Cove joint where floor meets wall is a common entry point
Window Wells
Poorly drained window wells allow water to enter through windows
Pipe Penetrations
Gaps around pipes, wires, and utilities entering the basement
Signs You Have a Basement Leak
Water Stains on Walls
Discoloration or white mineral deposits (efflorescence)
Musty Odor
Persistent damp smell indicating moisture or mold
Visible Mold Growth
Black, green, or white mold on walls or floor
Peeling Paint or Wallpaper
Moisture behind walls causing finish to deteriorate
Standing Water After Rain
Puddles appearing during or after storms
Damp or Wet Carpet
Moisture coming up through floor or from walls
Rust on Metal Items
Excessive humidity causing metal to corrode
High Humidity
Condensation on windows, pipes, or cold surfaces
Basement Leak Repair Solutions
Crack Injection
$300 - $800/crackEpoxy or polyurethane injection seals foundation cracks from the inside. Fast, effective solution for most wall cracks.
- Same-day repair
- 10+ year warranty
- No excavation needed
Interior Drainage System
$5,000 - $12,000Interior drain tile and sump pump system captures water at the floor-wall joint and removes it from your basement.
- Handles severe water issues
- Works year-round
- Lifetime warranty available
Window Well Drain
$500 - $1,500/wellProper drainage from window wells prevents water from entering through basement windows. Includes gravel, drain connection, and cover.
- Prevents window leaks
- Clear window well covers
- Easy maintenance
Exterior Waterproofing
$10,000 - $25,000+Complete exterior excavation and waterproof membrane application. The most comprehensive solution for severe or multiple leaks.
- Prevents water entry
- Protects foundation
- 25+ year protection
Why You Should Fix Basement Leaks Quickly
Risks of Ignoring Leaks
- Mold growth within 24-48 hours
- Structural damage to foundation
- Damaged flooring and belongings
- Reduced home value
- Health issues from mold
Benefits of Quick Repair
- Prevent expensive damage
- Protect your family's health
- Maintain home value
- Lower repair costs
- Peace of mind
Basement leak repair by city
City guides for local soils and cost context, plus the full contractor directory.
Related Waterproofing Services
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Basement leak repair scopes that hold up
Crack injection, interior drains, and exterior membranes solve different problems. Match the repair to how water enters and how your foundation was built.
- Active flowing cracks may need injection plus drainage—not surface sealant alone.
- Cove joint leaks often need interior tile and sump, not only wall patches.
- Stone and brick foundations may need repointing before membranes are quoted.
- Get multiple quotes that describe the same failure mode, not different assumptions.
Prices in CAD. See the full 2026 Ontario cost hub for roof-to-foundation bands, basement city ranges, and the basement calculator.
Common questions
Related guides
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Resources & guides
Practical articles on moisture, foundations, and keeping water out of Ontario homes.
- Mold removal, remediation & basement mold
- Basement flooding & foundation damage
- What causes basement & foundation leaks?
- Interior vs exterior waterproofing
- Sika waterproofing
- Waterproofing membrane
- Basement waterproofing systems
- Warranties & service agreements
- Basement waterproofing cost (Ontario)
- Basement crack repair
- Benefits of pro waterproofing
- DIY vs professional waterproofing
- Damp proof membrane
- Schluter shower system