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Serving Southern Ontario Since 1998 Licensed & Insured Waterproofing • Drainage • Plumbing

Water Management

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Waterproofing, drainage, foundation and flood-protection solutions based on where the water is coming from.

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Basement Waterproofing

Interior Waterproofing Interior drainage and water management Exterior Waterproofing Foundation membrane and exterior drainage Foundation Crack Repair Diagnose and repair leaking foundation cracks

Drainage & Flood Protection

Sump Pump Installation Pumps, pits, backups and replacements Backwater Valve Protection against reverse sewer flow French Drain Installation Yard and foundation drainage correction

Foundation & Plumbing

Basement Underpinning Basement lowering and structural work Sewer & Drain Repair Backups, blocked drains and sewer problems Emergency Service Urgent flooding and plumbing assistance

Not sure which service matches the problem? Start with an assessment. Request an Assessment

Southern Ontario

Local waterproofing service

Explore local waterproofing, drainage, sump pump and flood-prevention services.

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Learn about waterproofing, compare options, review warranties and estimate potential project costs.

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Services

Basement Waterproofing

Interior Basement Waterproofing Exterior Basement Waterproofing Foundation Crack Repair

Drainage & Flood Protection

Sump Pump Installation Backwater Valve Installation French Drain Installation

Foundation & Plumbing

Basement Underpinning Sewer & Drain Repair View All Services

Service Areas

Toronto & Peel

Toronto Mississauga Brampton

Halton

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Hamilton & Niagara

Hamilton St. Catharines View All Service Areas

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Canada Waterproofers

Interior vs. Exterior Waterproofing

Answer a few questions about your situation and we'll recommend the best waterproofing approach for your home.

1. Where is the water entering your basement?

Through the walls (seeping, staining, or wet patches) Through the floor or floor-wall joint Through a visible crack in the wall Not sure / general dampness

2. Do you have access to the exterior of your foundation walls?

Yes — open yard, clear of obstacles Partially — some obstacles (deck, patio, landscaping) No — attached garage, neighbour's property, or no clearance

3. Is your basement finished (drywall, flooring, etc.)?

Yes — fully or partially finished No — unfinished / open walls

4. How severe is the water problem?

Minor — occasional dampness or humidity Moderate — visible seeping after rain or snow melt Severe — standing water, flooding, or active leaks

5. What is your primary concern?

Budget — I want the most affordable solution Permanence — I want the most thorough, long-lasting fix Minimal disruption — I don't want major digging or construction

Please answer all questions before seeing your recommendation.

Full Method Comparison

	Interior	Exterior
Addresses root cause	Manages water inside	✅ Stops water at source
Disruption to yard	✅ None	Excavation required
Disruption to interior	Floor perimeter cut	✅ None
Typical cost	✅ Lower	Higher
Works on finished basements	✅ Yes	✅ Yes
Requires exterior access	✅ No	Yes
Protects foundation membrane	No	✅ Yes
Best for	Managing recurring seepage	Long-term structural protection

Not sure which is right for your home?

Our specialists assess your foundation in person and recommend the most effective and cost-efficient solution for your specific situation — at no charge.

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📞 416-333-LEAK

© 2026 Canada Waterproofers. Recommendations are based on self-reported information and are indicative only. An on-site inspection is required for a definitive assessment.

Waterproofing & Drainage Assessment

Not sure where the water is coming from?

Tell us what you are seeing. We can assess whether the problem involves the foundation, interior drainage, sump system, sewer connection or exterior water management.

Request a Free Assessment → 416-333-5325

Serving Since 1998 Water-management experience Warranty Protection Transferable on qualifying systems Licensed & Insured Professional Ontario contractor BBB A+ Rated Independent customer reviews

CANADA WATERPROOFERS Waterproofing • Drainage • Plumbing

Basement waterproofing, drainage, sump pump and flood-prevention services for homeowners across Toronto, Peel, Halton, Hamilton, Niagara and surrounding Southern Ontario communities.

Our Locations

51 Wolseley St, Suite 108
Toronto, ON M5T 1A5

Mississauga

3410 Semenyk Ct #9
Mississauga, ON L5C 4P8

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Interior Basement Waterproofing
Exterior Basement Waterproofing
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Service Areas

Toronto Mississauga Brampton Oakville Burlington Milton Hamilton St. Catharines

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Licensing & contractor information

Toronto License: T94-4543511, P25298, B25300, T95-4543513, T85-4543510 | Oakville License: 2023 100463 000 00 LICE, 2023 100455000 00 LICE | Mississauga License: 2025 008967 TC & 2025008966 TM | Hamilton License: 23 301959 00CL, 23 301960 00MA

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