Foundation Waterproofing Cost Ontario 2026
Interior, exterior, and crack-injection ranges—plus city bands—so you can compare written scopes before you hire.
See the full 2026 Ontario waterproofing cost hub for city bands, per-linear-foot exterior ranges, and our calculator.
Foundation Waterproofing Cost Overview
Interior Waterproofing
$3,000 - $10,000
Sealants, drainage, coatings
Exterior Waterproofing
$10,000 - $25,000+
Full excavation, membrane
Cement/Concrete Foundation
$5,000 - $15,000
Crack repair + waterproofing
Foundation waterproofing costs depend on the method used, foundation size, and severity of water issues. Most Ontario homeowners pay between $5,000 and $15,000 for comprehensive protection. Sanity-check quotes with the cost calculator.
City cost bands (interior / exterior)
| City | Interior | Exterior |
|---|---|---|
| Toronto | $4,000–$10,000 | $10,000–$22,000 |
| Mississauga | $3,500–$9,500 | $9,000–$20,000 |
| Vaughan | $3,800–$10,500 | $9,500–$21,000 |
| Oakville | $4,000–$11,000 | $10,000–$24,000 |
| Hamilton | $3,500–$9,500 | $8,500–$19,000 |
| Ottawa | $3,800–$10,500 | $9,500–$22,000 |
| Kitchener | $3,200–$9,000 | $8,000–$18,000 |
| Windsor | $3,000–$8,500 | $7,500–$17,000 |
Crack-only scopes: basement crack repair guide. Contractors: directory.
Cement Foundation Waterproofing
Cement (concrete) foundations are the most common type in Ontario homes. While durable, concrete is porous and develops cracks over time, allowing water to seep into your basement. Proper waterproofing is essential to protect your home's structural integrity and prevent mold growth.
Cement Foundation Issues
- Hairline Cracks
Common in settling foundations, allow water seepage
- Structural Cracks
Larger cracks indicating foundation movement
- Cold Joints
Weak points where concrete was poured in stages
- Porous Concrete
Water wicks through concrete over time
Solutions & Costs
- Crack Injection
$300-$800 per crack for epoxy/polyurethane
- Interior Sealant
$3-$6 per sq ft for waterproof coating
- Exterior Membrane
$100-$150 per linear foot
- Complete System
$5,000-$15,000 for full foundation
Waterproofing Methods & Pricing
Interior Waterproofing
$3,000 - $10,000Interior solutions manage water that enters your basement. Includes sealants, interior drain tile, and sump pumps.
- Waterproof paint/sealers: $500-$1,500
- Interior drain tile: $5,000-$12,000
- Sump pump installation: $1,200-$3,000
- Vapor barrier: $2-$4 per sq ft
Exterior Waterproofing
Excavation around foundation to apply waterproof membrane and install exterior drain tile. Prevents water from reaching foundation.
- Excavation: $50-$100 per linear ft
- Membrane application: $30-$50 per linear ft
- Exterior drain tile: $25-$50 per linear ft
- Landscaping restoration: $1,000-$3,000
Crack Repair Only
$300 - $1,500For minor issues, crack injection alone may solve water intrusion. Uses epoxy or polyurethane to seal foundation cracks.
- Epoxy injection: $300-$600 per crack
- Polyurethane injection: $400-$800 per crack
- Includes warranty (typically 10+ years)
- Same-day completion for most repairs
Factors Affecting Foundation Waterproofing Cost
Foundation Size
Larger homes with more linear footage cost more to waterproof
Foundation Depth
Deeper foundations require more excavation for exterior work
Water Table Level
High water tables require more robust drainage solutions
Existing Damage
Structural repairs add to total project cost
Access Difficulty
Obstacles like decks, driveways, or landscaping increase costs
Material Quality
Premium membranes and longer warranties cost more
Foundation Waterproofing Across Ontario
Related Waterproofing Services
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Resources & guides
Practical articles on waterproofing, foundations, and moisture—written for Ontario homeowners.
- 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