Basement Waterproofing Services Since 1961
More Than 60 Years of Waterproofing Experience and 50,000+ Projects Completed.
For more than six decades, City Wide Group has helped homeowners across Toronto, the GTA, Niagara, Hamilton, Kitchener–Waterloo, and beyond protect their homes from leaks, flooding, and foundation damage. Whether you’ve noticed a damp corner or you’re dealing with a chronically wet basement, our experienced crews bring proven solutions, clear advice, and respectful service to every job.
From the first inspection to the final cleanup, we focus on long-term fixes—not temporary patches—so you can stop worrying about water and start using your basement with confidence.
Basement Waterproofing Services
Every home and every foundation behaves a little differently. Soil conditions, grading, age of construction, and previous repairs all influence how and where water finds its way in. That’s why City Wide Group offers a complete range of waterproofing and foundation services, so we can match the solution to your specific property instead of forcing every basement into the same one-size-fits-all approach.
Blindside Applications
In addition to residential and commercial basements, City Wide Group supports builders, developers, and contractors with specialized blindside waterproofing systems for new construction and below-grade structures.
50,000+ Projects Completed Across Ontario
With more than 50,000 projects completed since 1961, we’ve seen just about every kind of basement and foundation issue there is. That experience means we can quickly identify the cause of a leak and recommend the approach that actually fixes it—not just the one that looks good on the surface.
We’ve worked on century homes with stone foundations, newer homes with poured concrete, multi-unit buildings, commercial spaces, and everything in between. That breadth of experience is why so many homeowners, property managers, and contractors trust City Wide Group with their most important asset: the structure of their building.
Leader in Basement Waterproofing in Toronto
City Wide Group is a trusted basement waterproofing company in Toronto, providing both interior and exterior solutions for wet basements, leaks, foundation cracks, and mould concerns. As a family-owned business, we understand how stressful water issues can be, and we take the time to explain your options in plain language before any work begins.
Whether you need a single wall repaired or a full-perimeter waterproofing system, our team designs a solution tailored to your home, your budget, and your long-term plans.
FEATURED WATERPROOFING PROJECTS IN TORONTO & THE GTA
From older Toronto homes with stone foundations to newer builds in the suburbs, City Wide Group has completed thousands of successful waterproofing projects across the GTA. Below are a few examples that show how we diagnose the real cause of a leak, recommend the right solution, and complete the work with careful attention to your property. Explore these featured projects to see the types of results you can expect when you trust your basement and foundation to our team.
The client contacted The City Wide Group requesting a professional basement waterproofing estimate for the church property located at Howarth Ave. The primary concern was potential water intrusion originating from aging foundation components.
The client contacted The City Wide Group regarding concerns about moisture and potential water infiltration along a section of the basement foundation. After a site assessment, exterior waterproofing was recommended to protect the property from further deterioration.
The client contacted The City Wide Group regarding concerns about moisture and potential water infiltration along a section of the basement foundation. After a site assessment, exterior waterproofing was recommended to protect the property from further deterioration.
The client contacted The City Wide Group for concerns related to moisture and water infiltration along the basement foundation. An initial site assessment recommended 8 linear feet (LF) of exterior waterproofing, as well as the removal and later reinstallation of interlock once the soil has adequately settled.
The client contacted The City Wide Group regarding water infiltration concerns affecting the basement area of the property. A site assessment was completed, and exterior waterproofing was recommended as the most effective solution.
The client contacted The City Wide Group regarding water infiltration concerns in the basement. A site assessment was conducted, and exterior waterproofing was recommended.
The client contacted The City Wide Group regarding foundation concerns and signs of water infiltration. Upon inspection, it was determined that exterior waterproofing was required.
The client contacted The City Wide Group reporting cracks in the property’s foundation. Upon inspection, the foundation cracks were identified as the primary issue, posing potential risks of water infiltration and further structural damage.
Why Choose Us
Over 63 Years as Your Toronto Waterproofing Company
The City Wide Group has been a leading Toronto waterproofing company for over six decades. Since we first opened our doors in 1961, we’ve delivered nothing but quality work that is completed on time and on budget – it’s how we built our reputation in our community as a trusted waterproofing company in Toronto.
Family owned and operated, our team has spent decades helping clients with all their water damage, waterproofing solutions and waterproofing services, foundation cracks, basement wall, and wet basement needs. We always prioritize our clients and their needs; it’s what’s propelled City Wide Group to win the prestigious Consumer’s Choice Award for 27 consecutive years.
For waterproofing and underpinning solutions that are sure to protect your home, choose The City Wide Group.
Our expert advice and timely, dependable service are backed by an accurate estimate that will be done well in advance of the project commencing – and we always guarantee customer satisfaction after the work is complete. We can permanently prevent wet and leaky basement Toronto issues and seal foundation cracks – inside and out . Additionally, we install weeping tiles, drains inside or out, and underpin your basement to ensure that your home is fully waterproofed. .
Safeguard your family’s health and your property’s value with a waterproofing company Toronto you can trust – contact The City Wide Group.
Our philosophy is simple: diagnose each problem carefully, recommend only the work you actually need, and stand behind every project we complete. This approach has helped us earn repeat business and referrals from generations of homeowners who call us whenever they move, renovate, or invest in additional properties.
We have been ensuring the safety of families and companies with our waterproofing and underpinning services for more than 60 years at The City Wide Group. Founded in 1961, our family-owned business has completed more than 25,000 projects, serving the community with their needs. Along with gaining community trust, we have received the Consumer’s Choice Award for 29 consecutive years, honoring our devotion to quality workmanship. Our customers will enjoy peace of mind knowing that their property will be protected for generations to come, thanks to our fully transferable lifetime warranty.
Over the years, we’ve worked on homes and buildings of every style and age. That depth of experience allows us to quickly recognize problem patterns, catch hidden risks, and design waterproofing systems that respond to real-world conditions—not just textbook scenarios.
Many new customers find us because a neighbour, realtor, or contractor recommended us after seeing how well our work has held up over time. That long-term trust is what drives us to maintain high standards on every single project.
HOW MUCH DOES IT COST TO
WATERPROOF A BASEMENT IN TORONTO?
Basement waterproofing costs in Toronto and the GTA vary depending on several key factors: the size and depth of your foundation, whether work is completed inside or outside, how accessible the walls are, and how much damage has already occurred. Interior solutions are often less invasive and more economical, while full exterior systems can provide comprehensive, long-term protection for entire walls.
At City Wide Group, we begin with a thorough on-site assessment. You’ll receive a clear, written estimate that outlines the recommended scope of work, the methods we’ll use, and the associated costs. There are no hidden extras—just transparent pricing and a step-by-step plan.
If you’re comparing quotes, we’re happy to explain the differences in materials, methods, and warranties so you can make a confident decision about which option offers the best long-term value for your home.
See the table below for a general pricing guide. These are approximate ranges only; your actual cost will depend on an on-site assessment.
| Waterproofing Method | Estimated Cost (Per Linear Foot / Job) | Best For | Details |
|---|---|---|---|
| Exterior Waterproofing | Approx. $150 – $350+ per linear foot | Severe leaks, chronic seepage, accessible foundation walls | Most durable long-term solution. Requires excavation down to the footing, crack repair, new waterproofing membrane, drainage mat, and weeping tile to keep water away from the foundation. |
| Interior Waterproofing | Approx. $80 – $180 per linear foot | Finished basements, limited exterior access, mild to moderate seepage | Installed from inside the basement along the interior perimeter. Uses interior drains and a sump pump to collect and redirect water without full exterior excavation. |
| Foundation Crack Injection | Approx. $350 – $1,200 per crack | Isolated vertical cracks in poured concrete foundations | Non-invasive repair from inside the basement using specialized resins or epoxies to seal cracks and stop targeted leaks. |
| Sump Pump Installation | Approx. $1,000 – $3,000 per job | Water-prone areas or active groundwater issues | Installation or replacement of a sump pit and pump to move collected water safely away from your home. Often paired with interior waterproofing systems. |
| Weeping Tile Replacement | Approx. $120 – $275+ per linear foot | Poor drainage or clogged / failing existing systems | Removes old weeping tile and installs new drainage to carry water away from your foundation, helping prevent future leaks and hydrostatic pressure. |
All pricing is approximate and may vary based on access, depth of dig, permits, landscaping, and the overall scope of work.
Our Step-by-Step Waterproofing Process
Whether you need a small crack repair, a full exterior system, or a complete basement transformation, our team can walk you through your options in plain language and help you decide what should be prioritized first. In many cases, we can phase work to match your budget and timing while still addressing urgent risks right away.
Our typical waterproofing process includes:
- Inspection & Diagnosis – We review both the interior and exterior of your foundation, looking at visible cracks, moisture patterns, grading, and drainage to understand how water is entering.
- Detailed Estimate – You receive a clear, written estimate outlining recommended solutions, scope, timelines, and pricing so you know exactly what to expect.
Permits & Utility Locates – Before excavation begins, we arrange utility locates and any required permits to ensure work is completed safely and in compliance with local regulations.
- Excavation & Preparation – Where necessary, our crews carefully excavate, clean the foundation walls, and prepare all surfaces for repairs, membranes, and drainage components.
- Repairs, Membranes & Drainage – We repair cracks and voids, apply professional waterproofing membranes, install drainage mats, and lay new weeping tiles to collect and redirect water away from your foundation.
- Backfilling & Site Restoration – Once the system is installed and tested, we backfill with appropriate materials, compact the soil, and restore affected landscaping and hardscaping as agreed.
- Final Walkthrough & Warranty – At the end of the job, we walk you through what was done, answer your questions, and provide your written warranty documentation for long-term peace of mind.
Signs You May Need Basement Waterproofing
Water on the Basement Floor
Puddles, damp spots, or a “sweating” concrete floor are clear signs that water is finding its way in. Even if these areas dry out between storms, recurring moisture can damage finishes and encourage mould growth behind walls and under flooring.
Stained or Flaking Foundation Walls
White, chalky deposits (efflorescence), peeling paint, or soft spots on basement walls often indicate water moving through the foundation. These cosmetic clues usually appear long before a major leak and are an early warning that your waterproofing system needs attention.
Musty Odours and Mould
A persistent musty smell, visible mould patches, or allergy-like symptoms when you spend time in the basement all suggest elevated moisture levels. Effective waterproofing, drainage improvements, and better ventilation are often required to solve the problem—not just cleaning the surface.
Water Around Windows or at the Top of Walls
Water tracking in around window frames or seeping from the top of basement walls can point to grading issues, window well problems, or surface water overwhelming existing drainage. Addressing these concerns early can prevent more serious leaks and structural stress.
Risks of Ignoring Basement Water Leaks
Structural Damage Over Time
Water weakens concrete, mortar joints, and masonry as it moves through and freezes and thaws. What starts as a hairline crack or minor leak can evolve into bowing walls, shifting footings, or significant structural repairs if left unaddressed.
Lower Property Value and Difficult Resale
Active leaks, visible water stains, or a damp smell in the basement are major red flags for buyers and home inspectors. Investing in proper waterproofing now can make your home easier to sell and help protect its market value.
Health and Indoor Air Quality Issues
Damp basements are ideal environments for mould, dust mites, and other allergens. These can affect indoor air quality throughout the home, not just in the basement—especially when heating and cooling systems circulate air between floors.
Pests and Unwanted Guests
Moist, hidden areas around foundations can attract insects and rodents. By controlling water and moisture levels, you make your home less appealing to pests and reduce the risk of secondary damage.
Why Homeowners Choose City Wide Group
Decades of Specialized Experience
Since 1961, City Wide Group has focused on waterproofing, drainage, and foundations. That specialization allows us to spot problems quickly, recommend the right method the first time, and execute projects efficiently on-site.
Lifetime, Fully Transferable Warranty
We back our work with a lifetime warranty on treated areas that stays with the property, not just the person who hired us. When you sell your home, you can pass that protection on to the next owner—adding confidence and value at resale.
Local Crews, Local Knowledge
Toronto, Hamilton, Niagara, Kitchener–Waterloo, and Vancouver each have their own soil conditions, housing styles, and weather patterns. Our local teams understand these realities firsthand and design waterproofing solutions that are proven to work in your specific area.
Clear Communication from Start to Finish
We explain what we’re doing and why, walk you through each stage of the job, and keep you updated if conditions change during excavation. When the work is done, we show you exactly what was installed, how it works, and what is covered under your warranty.
Ontario Locations
With locally based crews across Ontario, we understand the specific soil conditions, drainage patterns, and housing styles in each region we serve. That local insight helps us recommend solutions that match how homes and foundations are actually built in your community.
Vancouver Location
Our Vancouver location brings City Wide Group’s decades of waterproofing and underpinning experience to the West Coast, adapting our proven methods to local building practices and climate conditions. Homeowners and businesses receive the same careful assessment, quality workmanship, and strong warranty coverage that have defined our work in Ontario since 1961.
Waterproofing Toronto Homes for 63 Years
It’s important that basement leak repairs are done right so that the issue doesn’t every again come back. And the only way to do that is to work with a basement leak repair Toronto team that has the experience and knowledge necessary to get the job done right the first time. And here’s the best part: we use our decades of knowledge and experience to keep your basement leak repair cost down as much as possible. We also provide proactive services, like waterproofing and underpinning, to ensure that your basement is ready to withstand everything the elements can throw at it.
Because we’ve seen how quickly minor problems can escalate, we always encourage homeowners to reach out as soon as something seems off—whether it’s a musty odour, a small crack, or occasional dampness. Early intervention often means a simpler, less invasive repair and helps you avoid the disruption and expense of a major flood or structural fix.
Waterproofing Services In Toronto And The GTA
Wherever you are in the GTA or surrounding regions, there’s likely a City Wide Group crew nearby. Use the links below to explore how we approach waterproofing and underpinning in your area and what makes each region’s foundation challenges unique.
What Our Clients Have to Say
Homeowners across Toronto, the GTA, and beyond trust City Wide Group with some of the most important work on their properties. Many of our projects come from repeat clients and word-of-mouth referrals—people who have seen our waterproofing systems stand up to years of weather and choose us again when they move or renovate.
From emergency flood response to planned underpinning and full basement upgrades, clients tell us they appreciate our professionalism, respectful crews, and how clean we leave the site when the work is complete. When you’re trusting someone to dig around your foundation, that kind of track record matters.
Our Latest Blogs
Waterproofing & Underpinning FAQs
Homeowners often have similar questions when they first start looking into waterproofing or underpinning. These FAQs cover the most common concerns—cost, methods, disruption, and long-term results—so you can feel more informed before we even visit your home.
Most exterior membranes and drainage systems are designed to work quietly in the background with minimal attention. However, sump pumps, backup systems, and surface drainage should be checked periodically to ensure everything is functioning as intended. During our final walkthrough, we explain any maintenance items that apply to your specific system.
Yes. While no system can control extreme weather or municipal infrastructure, proper waterproofing, sump pump installation, backwater valves, and drainage improvements all work together to reduce the risk of water entering your home during heavy storms.
Foundation repair focuses on structural stability—addressing cracks, settlement, or movement. Waterproofing focuses on keeping water out and controlling moisture. In many cases, the two go together: we may repair structural issues and then add waterproofing and drainage so the same water pressures don’t cause new problems down the line.
Permits are typically required for underpinning and structural changes, and sometimes for certain types of exterior work, depending on your municipality. City Wide Group can advise you on what is required and help ensure all work is completed in compliance with local building codes and regulations.
We design waterproofing solutions with your finished space in mind. If your basement is already finished, we’ll explain what needs to be opened up and how it will be restored. If you’re planning a renovation, we can coordinate waterproofing and underpinning first so you’re building on a dry, secure foundation instead of trying to work around leaks later.
Clay-heavy soils, which are common in many parts of the GTA, expand when saturated and contract when they dry. This constant movement can create pressure against foundation walls and open up small pathways for water. Effective waterproofing in clay conditions usually includes robust drainage (such as weeping tiles in clean gravel) and high-quality exterior membranes to relieve pressure and control moisture.
Older foundations often require a more customized approach. Mortar joints, irregular surfaces, and previous repairs all influence how water moves. We typically combine careful crack and joint repairs with suitable membranes, drainage systems, and sometimes interior solutions to manage water effectively without putting additional stress on aging walls.
Minor maintenance tasks—like extending downspouts, improving grading, or sealing very small surface cracks—can sometimes be handled by homeowners. However, full waterproofing systems involve excavation, drainage design, membranes, and sump systems that need to be installed correctly the first time. For those projects, professional installation is almost always the better long-term investment.
Waterproofing work can be done year-round, but exterior excavation is often easier during milder weather when the ground is not frozen and snow is minimal. Interior waterproofing can typically proceed in any season. If you’re already seeing leaks, the best time to start is as soon as possible—before the next major storm.
Yes. Controlling water entry and moisture levels is the foundation of mould prevention. Once water is managed through proper waterproofing and drainage, we can pair that with appropriate ventilation or dehumidification to help keep humidity in a healthy range and reduce the conditions mould needs to thrive.
Project timelines depend on the size of the home, the method used, and site conditions. Smaller interior systems can often be completed in a couple of days, while full exterior waterproofing or underpinning may take longer. During your estimate, we outline an expected schedule so you know how long crews will be on-site and how the work will be phased.
In many cases, standard homeowner’s insurance does not cover water entry through foundation walls, floors, or typical seepage. Policies vary, but coverage is often limited to sudden, accidental events—not ongoing leakage. That’s one reason many homeowners choose to invest proactively in waterproofing rather than risk a major, uninsured loss later on.
Early warning signs include musty odours, small damp spots on walls or floors, peeling paint, rust on metal surfaces, and white mineral deposits on foundation walls. You may also notice the base of wood framing or furniture becoming discoloured. If you see these indicators, it’s a good time to schedule a professional assessment.
When basement waterproofing is done properly—with quality materials, correct installation, and adequate drainage—it is designed to last for the life of the structure. That’s why we back our work with a lifetime, fully transferable warranty on treated areas. The key is addressing the real cause of the water problem, not just sealing over the symptoms.
Underpinning is a significant structural project, so there will be noise, dust, and limited access to parts of your basement while work is underway. Our crews complete the work in carefully planned stages to maintain full support for your home at all times. Before starting, we explain the full process, timing, and what to expect day-to-day so you can plan around the disruption. Once finished, you’re left with a stronger foundation and a more spacious, usable lower level.
Yes. In fact, combining waterproofing and underpinning is often the most efficient and cost-effective option. Because underpinning requires working right at the foundation level, it creates an ideal opportunity to add or upgrade waterproofing and drainage systems at the same time. This approach can reduce overall disruption and ensures your newly lowered basement is both structurally sound and well-protected from water.
Basements can leak for many reasons, including failed or aging exterior damp-proofing, clogged or broken weeping tiles, poor grading around the home, foundation cracks, high groundwater, or blocked drains. In older homes, original waterproofing systems may simply have reached the end of their lifespan. A professional assessment helps pinpoint the true cause so the repair plan addresses the source of the problem instead of just treating the visible symptoms.
Basement waterproofing is the process of preventing unwanted water from entering your basement or foundation. It can include crack repairs, membranes, drainage systems, sump pumps, grading improvements, and more. Proper waterproofing helps protect against mould growth, rot, structural deterioration, and damage to flooring, drywall, and stored belongings. It also makes your basement more comfortable, usable, and attractive to potential buyers.
Interior basement waterproofing usually involves cutting a narrow trench around the inside perimeter of the basement floor, installing a drainage pipe or channel, and connecting it to a sump pump or floor drain. As water collects at the base of the wall, it’s intercepted and carried away before it can reach your finished floors and walls. This method is especially useful when exterior excavation is not practical or when you are planning to finish or renovate your basement.
The cost of waterproofing depends on several factors: the size and depth of your foundation, whether work is done inside or outside, soil conditions, access for excavation, and the extent of existing damage. After a site visit, we provide a detailed, written estimate so you know exactly what is included. In many cases, addressing water issues early is significantly more affordable than dealing with a major flood or structural repair later on.
Exterior waterproofing stops water at the outside of your foundation by sealing the walls, installing membranes and drainage boards, and adding or replacing weeping tiles at the footing. Interior waterproofing manages water that has already reached your foundation by capturing it along the inside perimeter and directing it to a sump pump or floor drain. Both approaches are effective when used in the right situations, and in some cases a combination of interior and exterior work offers the best long-term protection.
Yes. Even hairline cracks can allow water to seep through under hydrostatic pressure, especially during heavy rainfall or spring thaw. Over time, that steady trickle can widen the crack, damage finishes, and lead to more serious structural problems. Having foundation cracks inspected and repaired early is usually far less expensive than waiting until they turn into major leaks.
Lifetime, Fully Transferable Warranty
The City Wide Group prides itself on superior quality, adhering to the philosophy of doing things correctly from the outset and striving for unmatched customer contentment. Our assurance in our craftsmanship and wealth of experience makes us the only company in Toronto & the GTA to offer a real LIFETIME WARRANTY. Opt for The City Wide Group for foundation waterproofing, and we promise your treated area will remain free from water or moisture entry for as long as your house stands. Our services come with a warranty certificate that is transferable to endless future homeowners.
Family Owned Waterproofing and Underpinning Experts since 1961
FREE WATERPROOFING ESTIMATE
Whether you have an actual water leak or evidence of water seeping through the walls, contact City Wide Group for a free estimate about how to waterproofing your basement.
Please complete this form and we will call you back to arrange an appointment for a Free Estimate.
