WATERPROOFING BASEMENTS SINCE 1995

Basement Waterproofing Thornhill

Your foundation deserves the protection of a reliable contractor with over 25 years of experience in the York Region. Whether your property is a classic build in Old Thornhill or a newer residence in the Uplands or Beverly Glen area, we provide expert waterproofing and basement waterproofing Thornhill services designed to tackle the specific drainage needs of the community. Backed by our industry-leading 25-year warranty, our solutions ensure that your home remains a dry, healthy, and safe environment for your family.

(416) 454-7575

Free Estimate

The Most Qualified Basement Waterproofing Experts in Thornhill

With over 25 years of experience and full licensing across Ontario, we deliver code-compliant, high-quality waterproofing and foundation repair solutions designed to protect homes from the region’s unique soil and drainage challenges. Our certified technicians follow Ontario Building Code standards and provide customized solutions to prevent basement flooding, foundation damage, and mold buildup.

Fully Licensed & Certified Across Ontario:

Ontario Plumbing License: F16194534
Toronto Master Plumbing License: T-95-4804177
Toronto Plumbing Contractor License: T94-5531005
Toronto Building Renovator License for 3 Trades:

- Basement Waterproofing: T85-4953944
- Underpinning: T85-4953944
- Concrete Work: T85-4953944
Mississauga Plumbing Contractor & Basement Waterproofing License: 2025 001668 TC
Mississauga Master Plumber License: 025 001445 TM
Hamilton Master Plumber License: 27-000118
Hamilton Plumbing Contractor & Basement Waterproofing License: 27-000133

With these accreditations, our team ensures safe, efficient, and long-lasting waterproofing for homes in Thornhill and surrounding York Region communities.

Expert Basement Waterproofing in Thornhill

Water can cause significant damage if it enters your basement. At Direct Waterproofing, we specialize in interior and exterior waterproofing solutions, serving Thornhill for over 25 years. Our licensed team is equipped with the latest tools and techniques to keep your basement dry.

We prioritize understanding your needs before any payment. You’ll receive a free estimate and answers to all your questions. Trust us to apply innovative methods and high-quality materials to protect your home effectively.

Graphic showing customer testimonials about waterproofing services.

Image of waterproofing materials being applied.

Graphic showcasing 25 years of experience in waterproofing.

What Basement Waterproofing Services Are Available In Thornhill?

Direct Waterproofing have a full range of waterproofing solutions available in Thornhill. Whatever the problem, we can help you to identify and solve it, and we make sure your basement stays permanently dry. Here are just some of the services that we offer:

EXTERIOR WATERPROOFING

Interior waterproofing provides an economic solution for minor damp problems,,..

$100-$300 per linear ft.

INTERIOR WATERPROOFING

Interior waterproofing is any solution that focuses on the interior of your property. ..

$70-$350 per linear ft.

EMERGENCY WATERPROOFING

Water damage can come fast, and is usually unexpected. Nobody can predict that a ..

$100-$300 per linear ft.

BACKWATER VALVE INSTALLATION

A backwater valve is an extremely important installation that will prevent your home ..

$1,000 to $3,000 per project.

FOUNDATION REPAIR

Our foundation repair services restore your foundation walls and floors back to a sturdy ..

$1,600-$3,200 per crack.

BASEMENT LOWERING

We offer full basement lowering services that give you the opportunity to create extra..

$1,600-$3,200 per crack.

WEEPING TILE INSTALLATION

Pools of water can collect behind your foundation walls, in your basement, or against..

$80 to $500 per linear ft.

WINDOW WELL INSTALLATION

Leaks and damp problems can sometimes be caused by a build up of water in your..

$3,000-$8,500+ per tile.

FRENCH DRAINS

There is nothing much worse than pools of water gathering in your yard, basement, or ..

$20 to $60 per linear ft.

SUMP PUMP INSTALLATION

Sump pumps are a highly effective method of dealing with extreme water retention in ..

$560-$3,500 per pump.

BATTERY BACKUP PUMP

A battery backup pump is a solution that provides backup power to your sump pump,,.

$300-$700+ per pump.

BACKFLOW PREVENTERS

To stop backflow, where sewage can come back up your pipes and into your basement,..

$500 to $3,000 per project.

DRAIN SNAKING AND CLEANING

Clogs in your drains can cause major problems, especially if they are in your main lines or..

$75-$350 per project.

SEWER DRAIN CLEANING

Your drain carries all of the waste water away from your home, and into the underground ..

$75-$350 per project.

Cost of Basement Waterproofing in Thornhill

Exterior basement waterproofing in Thornhill ranges from $100 to $300 per linear foot, while interior waterproofing services cost between $70 and $350 per linear foot. Additional services such as backwater valve or sump pump installations are priced at $1,000 to $3,500, and foundation repairs cost $1,600 to $3,200 per crack. Factors like work scope, methods used, and area size influence the total cost. Direct Waterproofing offers competitive rates and free estimates to protect your home with effective solutions. Contact us for a custom quote tailored to your property’s needs.

Basement & Flood Prevention Rebates in Thornhill

Thornhill homeowners can take advantage of several local and regional initiatives designed to lower the cost of essential basement flood protection improvements.

Thornhill SNAP – Climate Ready Homes Program

Through the Toronto and Region Conservation Authority (TRCA) Thornhill SNAP initiative, single-family homes may qualify for:

Free home consultation (with climate resilience & flood prevention advice)
Up to $3,800 in financial rebates for flood protection upgrades—such as installing backwater valves, sump pumps with battery backups, flood alarm systems, and eco-landscaping solutions like rain gardens
One free incentive for homeowners completing a consultation by August 31, 2025

Durham Region Basement Flooding Loan Program

If your Thornhill home has experienced sewer backup or flooding, you can access up to $3,000 interest-free from Durham Region. The loan is repayable over three years and applies toward:

Backwater valve installation
Sump pump systems (including battery backup)

Contact Direct Waterproofing today to schedule your free inspection in Thornhill and maximize savings on basement waterproofing projects.

Direct Waterproofing -
Call Us For An Estimate in Thornhill (416) 454-7575

When Might You Need Basement Waterproofing Services in Thornhill?

If you notice signs of a damp or leaky basement, it’s time to contact the experts. Temporary fixes won’t solve the issue, and ignoring it will only worsen the damage. Professional waterproofing keeps water away from your home, ensuring your basement stays dry and protected. Dampness can result from various factors, mainly because water follows the path of least resistance. Hydrostatic pressure, pooled water, or weak entry points can lead to leaks in your foundation walls and floors.

A damp basement becomes unusable and can damage your belongings and structural integrity. It’s essential to address any dampness or leaks as soon as possible.

Why Choose Our Basement Waterproofing For Your Thornhill Place?

Direct Waterproofing offer fully personalized basement waterproofing services in Thornhill, and aim to solve your problem by offering you the best solutions available anywhere. We offer a 25 year warranty on all of our work, so you can be sure that the problem will never return, and your basement will stay dry for years to come.

Why Choose Direct Waterproofing

Toronto’s Best Exterior & Interior Waterproofing

Satisfaction Guaranteed

Highest Quality Services in Waterproofing & Foundation Repair in Toronto.

25 Years of Experience

Our highly skilled technicians have over 25 YEARS EXPERIENCE.

Serving GTA

Direct Waterproofing company, serving the Toronto, and GTA Ontario communities, for 25 years.

Affordable prices

We provide exceptional basement waterproofing services, yet we don't overcharge our customers. We listen to our clients and provide quality services that are within their budget.

Certified

We'll get it right the first time because all our waterproofing experts are skilled, licensed, and experienced. They have handled numerous waterproofing projects in Toronto.

Warranty

At Direct Waterproofing, we want you to be secure and confident with the services we are offering. We provide a warranty of up to 25 years for all our basement waterproofing services.

The Best Materials

We ensure that our clients get the most out of our waterproofing services by using high-quality waterproofing materials. We understand that the effectiveness of waterproofing depends on the quality of materials used.

24 Hours Service

No matter what time it is, we are here to serve you.

Top Causes of Basement Water Damage in Thornhill Homes

Understanding the root causes of basement moisture is the first step in preventing long-term damage. Thornhill homeowners commonly face:

1. Hydrostatic Pressure

Excess groundwater builds up around your foundation, creating pressure that pushes water through cracks and gaps in your basement walls or floor.

2. Freeze-Thaw Soil Movement

Fluctuating temperatures during winter months cause soil to expand and contract. This movement can shift your foundation and result in structural cracks that let in moisture.

3. Poor Drainage and Clogged Systems

Blocked or aging weeping tile systems, downspouts, and gutters often fail to redirect water away from your foundation, causing puddling and basement seepage.

4. Deteriorating Waterproofing Systems

Older homes or improperly installed waterproofing systems can lose effectiveness over time, leaving your basement vulnerable to water intrusion.

Pro Tip: If your home is more than 10 years old and you’ve never had your basement assessed, now is the time to schedule a professional inspection to prevent future problems.

Reliable Foundation Protection & Basement Waterproofing in Thornhill

Thornhill’s established neighborhoods often feature mature landscapes where shifting soil and aging foundations can lead to unexpected moisture issues. We provide professional basement waterproofing in Thornhill, offering specialized exterior barriers and structural reinforcement to combat hydrostatic pressure. Our team focuses on long-term prevention, ensuring that your foundation remains resilient against the heavy runoff and seasonal thaws typical of the Vaughan and Markham border area, keeping your lower level dry and secure.

Frequently Asked Questions About Basement Waterproofing Thornhill

Why is basement waterproofing important in Thornhill?

Thornhill homes are prone to water intrusion due to clay-rich soils and seasonal freeze-thaw cycles. Waterproofing protects your home from foundation damage, mold growth, and costly repairs—especially during heavy rains or spring thaw.

How do I know if my basement needs waterproofing?

Common warning signs include water stains, musty odors, visible mold, cracked walls or floors, and consistent dampness. If you notice any of these in your Thornhill home, it’s time to schedule a professional inspection.

What waterproofing methods do you offer in Thornhill?

We offer both interior and exterior waterproofing, including:

Weeping tile replacement
Sump pump installations
Backwater valves
Crack injections (epoxy/polyurethane)
French drains
Foundation reinforcement and underpinning

Do I need a permit for basement waterproofing in Thornhill?

For minor interior work, permits are typically not required. However, exterior excavation or drainage system replacements may need permits from York Region or the City of Vaughan/Markham, depending on your exact location. Our team handles the permit process for you.

Are there any rebates for waterproofing in Thornhill?

While Thornhill does not currently have its own rebate program, some homeowners may qualify for flood prevention subsidies through the York Region or City of Markham/Vaughan. We help identify rebate opportunities and assist with the paperwork.

How much does basement waterproofing cost in Thornhill?

Costs vary depending on the method, size of the basement, and condition of the foundation. On average, projects can range from $2,500 to $15,000. We offer free, no-obligation quotes with transparent pricing.

How long does the waterproofing process take?

Most interior waterproofing jobs in Thornhill are completed within 1–3 days. Exterior projects or underpinning can take 4–10 days, depending on the scope. We always aim for timely, minimally disruptive service.

Basement Waterproofing in
Thornhill Reviews

Direct Basement Waterproofing Toronto

5.0

Based on 307 reviews

review us on

Callum Tyrrell

2 months ago

friendly team, very efficient and quick. Thank you.

IDK

2 months ago

excellent customer service and great workmanship no more water issues after heavy rain

Sara Shinwari

2 months ago

THE MILLION

2 months ago

it’s a great company with great workers i highly recommend

Raddish Moment

2 months ago

Quick response and fast repair work. The leak hasn’t returned since.👍

Chris Ho

3 months ago

Working with Jack and the team were great. They were all friendly, answered all questions and responds very quickly. Jack in particular is very communicative and ensures all needs are met and questions are answered. The team that did the job worked quickly and ensured the area was clean afterwards. Highly recommend!

Faye

4 months ago

We had a great experience working with Direct Waterproofing on our exterior waterproofing project. Terry, the project manager, was very knowledgeable and took the time to clearly explain the situation and the recommended solution. The estimate was accurate and the work was completed in two days as expected.

The two-person crew arrived on time each day and worked efficiently throughout the project. They were professional and the finished work looks very well done. Overall, we're very happy with how everything turned out. Thank you, Terry and Direct Waterproofing Team!

Andrew Glavac

6 months ago

We recently had waterproofing work done in our basement by Direct Waterproofing, and we’re truly so pleased with the entire experience. Terry Lisevych and his crew were not only highly professional, but also friendly, respectful, and clearly took pride in their work. The quality was excellent, everything was completed on time, and they kept the job site spotless from start to finish.

From the very beginning, Terry was reassuring and took the time to explain everything clearly, which gave us a lot of confidence moving forward. He truly delivered on everything he promised, and the results speak for themselves.

What really stood out was Terry’s knowledge, honesty, and straightforward approach—it made the whole process feel easy and stress-free. It’s clear he genuinely cares about doing the job right.

We’re very grateful for their work and would wholeheartedly recommend Direct Waterproofing to anyone looking for reliable, high-quality service.

Shadan El Shafei

6 months ago

Excellent service from start to finish. The inspection was very thorough and the technician answered all my questions patiently. The repair crew arrived on time and worked hard the entire day. They were respectful of my property and made sure everything was clean when the job was finished. After the waterproofing work was completed, the difference was immediately noticeable. Even during strong rainstorms the basement stays completely dry.

Valerie Stubbins

8 months ago

We had a great experience with Direct Waterproofing. We contacted Terry on January 5 and he came out the very next morning to assess a foundation crack in our 1980s home. He provided a detailed quote later that same day.

Despite very cold weather and snow to clear, Thomas and John completed the repair on January 19 after the utility lines were marked. They did a great job and left the area clean. Terry provided photos taken throughout the repair and a lifetime warranty.

We also used Direct Waterproofing in 2024 for a window well drainage repair and another foundation crack with the same high-quality service. Highly recommend.

Mr T

1 year ago

Thank you Jack ,Terry & workers Nick and Vasyl. Quality materials & quality work. Attention to detail. Great team.

Response from the owner

1 year ago

On behalf of Terry and Jack, we want to thank you for such a great testimony.It has been a pleasure working for you.

Avin Athari

1 year ago

We had a great experience with this company for our waterproofing project. Everything was completed on time and exactly according to plan. Throughout the process, Greg, Terry, Thomas, and Max were all friendly, professional, hardworking, and a pleasure to work with. Thank you for making the process so smooth! We really hope their solution will keep us worry-free for the long run.

Response from the owner

1 year ago

On behalf of Greg, Terry and the crew, we want to thank you for such a great review. Your experience is very important to us. It has been a pleasure working with you.

Paolo Tersigni

1 year ago

I couldn’t be happier with the results. Terry and his team were professional, efficient, and clearly experienced. From the initial inspection to the final walkthrough, they explained every step and made sure I understood the process. The work was completed on time, with no mess left behind, and most importantly — no more water issues! I feel confident and secure knowing my home is protected. Highly recommend to anyone looking for quality waterproofing!

Response from the owner

1 year ago

Dear Paolo, thank you so much for such a great testimony. It has been a pleasure working with you.

John Hughes

1 year ago

Excellent work at a reasonable price. They job started on time in the morning and completed the work by 6.00pm thanks to an Incredibly hard working team. Project manager Jack could not have been more helpful.

Response from the owner

1 year ago

Thank you, John, for your positive feedback! We're delighted to hear that you found our work excellent and reasonably priced. It's fantastic to know that the project started on time and was completed efficiently by our hardworking team. Jack always strives to be as helpful as possible, and we're glad he made a positive impact on your experience. If you need any further assistance in the future, please feel free to reach out.

Alison LoBianco

1 year ago

Would highly recommend Direct Waterproofing. Terry and his crew were professional, worked fast and did a great job. Fair pricing for interior waterproofing- sump pump and bench installation. Terry took the time to explain all of our questions. We plan to use them again to install a back flow valve.
Just had the back flow valve installed. Terry and team were quick and professional. We would highly recommend and would definitely use again for any future waterproofing needs!

Response from the owner

1 year ago

Thank you, Alison, for your glowing review and recommendation! We're delighted to hear that Terry and the crew provided you with professional and efficient service for both the interior waterproofing and backflow valve installation. It's fantastic that Terry took the time to address all your questions, ensuring you felt informed throughout the process. Your satisfaction with our fair pricing and quality work means a lot to us. We look forward to assisting you with any future waterproofing needs.

Suzana Majcen

1 year ago

Direct Waterproofing company was amazing. From the 1st interaction, where Greg came to see my basement leak issue, to final day when it was completed. Greg was able to provide a quote right after he inspected the outside and inside the house. Their price was very competitive. They arranged for the "locate service" by City of Toronto. They came when they said they will come. When they discovered that what was under the porch was not what they at first thought, they quickly came up with a second solution, that was still close to the initial quote. The whole activity was lead by Terry. I don't know who the initial crew was, but second crew was Roman and Walter. They worked very hard, and were super careful and tidy. They dug over 25 feet around the front and side of the house, waterproofed the foundation, added weeping tile and cleaned up really well. They also dug a big hole for a sump pump in a tiny space of the furnace room corner without any issues. Now you can't even tell there is a sump pump there. Terry also came a few days later to do some touch ups! They were awesome! I would recommend them to anyone that is looking for a great experience and good workmanship!

Response from the owner

1 year ago

Dear Suzana, on behalf of Terry, Greg and the crew, we want to thank you for such an amazing review. It has been a pleasure working for you.

Daniel Batista

1 year ago

Great service Jack explained everything very satisfied with the work.
Thanks to your team .

Response from the owner

1 year ago

Thank you, Daniel, for such a great feedback. It has been a pleasure working with you.

David M

1 year ago

The Directwaterproofing team were amazing, got right to it and worked till it was done. They were hardworking and great to get along with. Thanks John, George, Faro and Terry.

Response from the owner

1 year ago

Dear David, on behalf of Terry and the entire Direct Waterproofing Team, we want to thank you for such a great testimony. John, George and Faro are a very hardworking guys and your positive review will benefit their motivation.It has been a pleasure working with you.

Steven Indrigo

1 year ago

Walter, Roman, Dima, and Terry from Direct Waterproofing did an excellent job on our exterior waterproofing and sump pump installation. It was a challenging job, as they had to undermine our back extension and work in a narrow alley with little room to move. They were professional, polite, skilled, and hard working. Highly recommend.

Response from the owner

1 year ago

On behalf of the crew and entire Direct Waterproofing Team, we want to thank you for such a wonderful feedback. It has been a pleasure working with you.

Jody Malone

1 year ago

This company is FANTASTIC. Terry and his team worked so hard every day. And to finish the job, they returned on the weekend. His team members are strong and physically fit. Terry returns all calls promptly and explains everything respectfully and comprehensively. I recommended them to a friend and she found the exact same thing. They know what a good hard day's work looks like! *****

Response from the owner

1 year ago

Thank you, Jody, for such a great review. We really appreciate it as it motivates us to continue deliver a great service and improve along the way.It has been a pleasure working with you.

Abdulrasheed Muhammad usman

2 years ago

The team ensured that everything was correctly sealed and effectively repaired the leak. Even with the intense downpour, my basement is now totally dry. The fact that they cleaned and organised everything afterwards is the finest part. I heartily suggest them for any leaky basement problems!

N Mosk

2 years ago

Professional crew, timely service, and no more leaks.

Olga Shmyrina

2 years ago

Great service! Our basement is dry even after heavy rains. Highly recommend!

Ella

2 years ago

Prompt service and high-quality work. No more worries about water damage. Thank you.

Michael Mao

2 years ago

Job was well done and Terry assisted and explained to me through out the process from the beginning to the end.

Tracy Cheng

2 years ago

I don’t typically write reviews but I’ve had a few experiences with Direct Waterproofing now and wanted to call Terry and his crew out for their great work. They are efficient, clean, and Terry is very communicative and responsive.

DW completed the exterior and partial interior waterproofing on our semi and they were very respectful of the space in always keeping it tidy and clean. And it was nice to have people show up when they say they would and finish on time. Shortly after, we had an issue with dampness in our basement and Terry came out immediately to check on the issue (turned out it wasn’t related to the waterproofing). So when it came time to filling the cement in, I didn’t hesitate reaching back out to Terry versus looking for a different company to do the work. They were able to fit the job in shortly after I reached out and they’ll be coming by again to help reroute my sump pump line. All in all, I wish all other contractors were as responsive and easy to work with as Terry.

Dipin Dhingra ArriveSAFE Immigration

2 years ago

I had a water leakage issue in the basement after every rain for the last 2 years, but never found the root cause. This time I contacted Direct Waterproofing. Terry came in and checked and provided in depth plan on how to fix the foundation crack issue from outside. He was continuously in touch with me all these days and made me feel confident with the choice of solution seeing the cost involved (C$2000). And today, TERRY and his 2 very hard working team mates, JOHN and THOMAS, came in and dig the whole soil almost 7-8 feet, did all the treatment and re-filled everything in just 8 hours. I was there watching the whole process, and I can say I felt very satisfied with the hard work they put into this project. The price was worth it, but most importantly I got peace of mind now. I would highly recommend Terry and his team for any waterproofing work. They are very genuine and will not try to sell you unnecessary services. And they also give 25 years warranty.

Wolston Lobo

2 years ago

Terry from Direct waterproofing is one of the best professionals I've met. And I don't say it lightly. We needed a sump pump and backup battery pump + discharge pipe.
Terry took the time to brainstorm ideas on where the discharge pipe should go so we don't cycle back the water into our sump pit.

Before installation he took out a lot of garbage that was in the sump pit. He took out plant roots that had grown from underground.

Terry not only installed both pumps and a discharge pipe but came twice and made sure we got everything needed to receive the city rebate.

After each work was done he took the time to clean the debris as well. This is what I call a true professional. You can tell pretty quickly that Terry really cares about the customer. Would highly recommend. 5 stars!

PAUL W.

3 years ago

Thank you to Terry and his wonderful team at Direct Waterproofing . They fixed our water issue in the basement with amazing professionalism. They got the job done and was finished in a very good amount of time . They made sure everything was tidy and finished right . The cost was also reasonable . As you know when you have water coming into your home it can be very upsetting, but Terry was very reassuring and made the process very easy and positive .
Thank you Terry and crew !
Christina and Paul

Matthew McKay

3 years ago

So happy to be able to write another 5 star review for Direct Waterproofing! The team had done some some work for me a couple of years ago (basement inside waterproofing and installing a sump pump - which has been working fabulously!) and while they were here, they applied some concrete parging around my home to seal the area between the foundation and the bottom of the home. Due to weather it had cracked a bit and when I called Terry to see if they could come back and seal it again he was more than willing to help! Although this is a very busy season for them, Terry himself came and did the job. He was so pleasant and thorough and now everything is sealed up before the winter. And … he did it free of charge! I’m very impressed with Terry and his team. Would highly recommend! Thanks!