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Basement Waterproofing

Basement Waterproofing Solutions in Toronto

Have Questions? Our Foundation Experts Are Ready to Help.

20+
Years Serving Toronto
44
5-Star Reviews
5★
Customer Satisfaction
Basement Waterproofing

How We Fix Leaky Basements

We are Toronto's basement waterproofing specialists and guarantee all waterproofing work with a 20-year transferable warranty. We diagnose and fix leaky, wet basements — giving homeowners new space they can use in their homes.

Whether your basement has a small leak, dampness, or visible water entry, we'll find the source and recommend the right solution — exterior waterproofing, interior waterproofing, or a combination of both.

Emergency Basement Flooding?

If you have an active leak, standing water, or suddenly flooding basement, immediate action is required to prevent structural damage and mold growth.

Rapid response for active basement leaks
Sump pump failure replacement
Temporary fixes and permanent solutions to stop water fast

Call us immediately at (416) 879-4593 for urgent assistance.

We Specialize In:

  • Exterior Waterproofing
  • Interior Waterproofing
  • Weeping Tile Systems
  • Sump-pits & Sump-pumps
  • Backflow Valves
  • Window Well Drains
  • 20 year transferable warranty on all waterproofing work

Ready to get started?

Call 416-879-4593 or request your free estimate online.

Get Free Estimate

Our Waterproofing Process

From initial diagnosis to final cleanup, we follow a rigorous process to ensure your basement stays dry.

1

Free On-Site Inspection

We come out, look at your basement, and figure out where the water is getting in.

2

Quote & Recommendation

We explain what we found and recommend interior, exterior, or both — with a clear price.

3

Waterproofing Installation

We do the work — excavation, membranes, weeping tile, sump pumps, backwater valves — whatever your home needs.

4

Cleanup & Warranty

We clean up, walk you through everything, and hand over your 20-year warranty paperwork.

Basement Waterproofing in progress

Signs You May Need Waterproofing

Water always finds the path of least resistance. Identifying how moisture is entering your basement is the first step to a permanent solution.

Musty odors or visible mold in your basement
White chalky staining on concrete walls
Damp spots on drywall or peeling paint
Water pooling on the floor after heavy rain
Rust on appliances or the bottom of your furnace

Learn more about Foundation Repair foundation repair so the structural issue is fixed before waterproofing.

Interior Waterproofing

A damp basement can be expensive, damaging and unhealthy! While exterior waterproofing is the best way to get to the source of the problem, interior waterproofing methods can seal out moisture when exterior access is not an option. If you are planning a new basement renovation, waterproofing is a must in order to protect your investment by preventing future water damage.

Weeping Tile | Sump Pumps | Backflow Valves

Weeping tile systems and sump pumps are parts of a drainage system designed to move excess groundwater away from your home. Older weeping tile systems should be examined for breakage or blockage and even replaced for maximum effectiveness. A mainline back-flow valve is highly recommended for new basement renovations as a preventative measure to keep your basement free of flooding and sewer back-ups.

Window Wells

If moisture is entering your home through a basement window you may need a drain installed in your window well so the water can't pool.

Exterior Waterproofing

By far the most effective way to stop water from entering your basement is to install an exterior waterproofing system. A job best left to professionals, exterior waterproofing involves excavating around your house down to the footing, repairing and sealing the exposed foundation walls, and then installing a new weeping tile system to move excess water away from your foundation.

When to choose exterior waterproofing:

Exterior waterproofing gets to the source of the problem and is the best long-term solution for leaky basements. It's ideal when you want complete, permanent protection for your home.

What's Involved:

Excavating around the house down to the footing
Repairing and sealing the exposed foundation walls
Installing a new weeping tile system to move water away from your foundation
Backfilling and restoring your property

Interior vs. Exterior: Which Solution Do You Need?

Understanding the differences between exterior vs interior waterproofing helps you make the right choice for your Toronto home. Both methods effectively protect your basement, but each has distinct advantages depending on your situation and budget.

FactorInteriorExterior
Cost$$$$$$$
EffectivenessGoodBest
InstallationInside onlyRequires excavation
SeasonYear-roundSpring-Fall ideal
DisruptionMinimalModerate

Not sure which solution is right for your home? Our waterproofing contractors in Toronto will assess your specific situation during a free inspection and recommend the most effective approach for your budget and needs.

Service Areas

Protecting Homes Across the GTA

We provide expert interior and exterior waterproofing services throughout Toronto, North York, East York, Scarborough, Etobicoke, Mississauga, Vaughan, and the Durham Region.

20-Year Transferable Warranty

We stand behind our waterproofing systems with one of the strongest guarantees in the industry.

By the Numbers

20+
Years Experience
GTA
Service Area
20
Year Warranty

Get Your Free How We Fix Leaky Basements Estimate

Speak with Saverio directly about your project. No obligation, no pressure — just honest advice from someone with 20+ years of experience.

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Quick FAQ

Frequently Asked Questions

Find answers to common questions about our waterproofing systems and processes.

How much do waterproofing solutions cost in Toronto?

Project costs depend on wall length and height, access, repairs, pump and backup options, and whether work is interior or exterior. You will receive a clear, itemized quote after a free on-site inspection. Contact us to schedule your assessment.

Get your free estimate

Do you offer emergency repair for active leaks?

Yes. We provide emergency basement waterproofing services across Toronto and the GTA. If you have an active leak, water seeping through walls, or flooding after heavy rain, call us at 416-879-4593. We'll assess the urgency, provide temporary mitigation if needed, and schedule permanent waterproofing solutions to protect your basement.

What is the difference between interior and exterior waterproofing?

Interior waterproofing manages water that has already entered your basement using weeping tile, sump pumps, and backflow valves. Exterior waterproofing stops water before it reaches the wall by sealing the foundation from the outside and installing drainage at the footing. Exterior is the most effective long-term solution, but interior is a practical option when exterior access is limited. We assess your home and recommend the right approach for your situation.

What does your 20-year waterproofing warranty cover?

Our warranty covers all materials and workmanship in treated areas for up to 20 years. If water enters through a wall or floor area we waterproofed, we come back and fix it at no cost. The warranty is transferable if you sell your home, which adds value and reassurance for buyers. Call us for full warranty terms.

How do I know if my basement needs waterproofing?

Common signs include musty odors, visible mold, white chalky staining on walls, damp spots on drywall, water pooling after heavy rain, or rust forming on basement appliances. If your Toronto home was built before 1980, the original waterproofing has likely deteriorated. A free inspection will confirm whether you need interior, exterior, or both types of protection.

Book a free inspection

Can you waterproof a finished basement in Toronto?

Yes. If your finished basement is showing signs of moisture, we can install interior waterproofing systems with minimal disruption. In many cases we work along the perimeter walls, install weeping tile beneath the slab, and add a sump pump — then restore the affected areas. For severe cases, exterior waterproofing may be recommended. We explain your options honestly before any work begins.

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Free Estimate

Toronto Basement Assessment

Site Visits Arranged When Convenient

Share details below and we'll leave you with a clear moisture-control or Toronto foundation repair plan. Progress photos available upon request.

Call or Text

(416) 879-4593

Email

cornerstone@live.ca

Location

Based in East York • Serving the GTA