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Find basement waterproofing pros in Thornhill, Ontario

If you’re looking to protect your basement from leaks, floods, or humidity, HomeStars can help. Our platform allows you to easily connect with professionals who can help with basement waterproofing in Thornhill, Ontario. Compare quotes, read reviews, and make the hire all in one convenient place!

Closeup of a worker’s gloved hands waterproofing the bottom of a concrete wall with blue sealant.

Some of our top rated basement waterproofing specialists in Thornhill, Ontario

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  • Basement Waterproofing Specialist in Thornhill, Ontario

    I have been working in the construction industry for over 5 years. We are currently working in the greater Toronto area, specializing in renovations, carpentry, drywall, concrete, and demolition/ haulage.

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  • Basement Waterproofing Specialist in Thornhill, Ontario

    Cooper Civil Contracting is a Greater Toronto Area–based company specializing in concrete and excavation services for residential, commercial, and industrial projects. The company provides reliable site preparation, foundation work, and concrete solutions with a strong focus on quality, efficiency, and safety. With over 20 years of management experience in the heavy civil construction sector, Cooper Civil Contracting brings proven expertise to every project. The team has extensive experience in road construction, commercial building foundations, and large-scale concrete floor installations, ensuring work is completed with precision and in accordance with project specifications. Cooper Civil Contracting is committed to professionalism, clear communication, and dependable performance. The company works closely with clients, builders, and contractors to deliver high-quality results on time and within budget, building long-term relationships across the construction industry.

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  • Basement Waterproofing Specialist in Thornhill, Ontario

    Since 1987, Basement Systems has been helping transform wet, leaky basements and nasty crawl spaces into dry, healthy, usable spaces with exclusive, patented products and proven services. Basement Systems is the world leader in designing and developing products and solutions for basement waterproofing, crawl space repair, basement finishing, and foundation repair. Today, Basement Systems has over 30 patents and a reputation as a trusted network of highly trained and reliable dealers specializing in "All Things Basementy!" Basement Systems of Toronto is a proud local installer of Basement Systems' basement waterproofing and crawl space repair systems. We are a trained and experienced Greater Toronto basement waterproofer, crawl space encapsulation, and foundation repair professional. We offer free, no-obligation inspections, timely installation, and regular maintenance checks of our systems. Please browse our website to learn more about who we are and what we do, or contact us today to let us know how we can help.

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  • Basement Waterproofing Specialist in Thornhill, Ontario

    If you need something done around your house whether big or small I can assure you, you’re in good hands. I’m a young entrepreneur who started my career in construction when I was 16 years old, however I grew up with a Portuguese father so weekends were typically full of work whether it was our house or a family members house. I’m now 24 years old I’ve been doing concrete, drywall, painting, framing, snow removal etc since I was 16 don’t let my age deter you, I’m very familiar with the OBC (Ontario Building Code) and can assure you everything will be done to the code standard.

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  • Basement Waterproofing Specialist in Thornhill, Ontario

    Sibel Construction Corp specializes in concrete, interlocking pavers, landscaping, stone and brick work, retaining walls, outdoor stairs, and exterior construction. We take pride in delivering durable, high-quality results with attention to detail and exceptional customer service. Whether it’s a driveway, walkway, patio, or custom outdoor project, fence, deck our team is committed to excellence from start to finish.

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  • Basement Waterproofing Specialist in Thornhill, Ontario

    Level One Drywall Finishing is a professional drywall finishing company providing high-quality taping, mudding, sanding, and surface preparation services for residential and commercial construction projects. The business is focused on quality craftsmanship, dependable scheduling, and professional service

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  • Basement Waterproofing Specialist in Thornhill, Ontario

    My name is Mitchell, and I am the owner of HG contracting and I’m excited to offer exclusive, competitive pricing for all renovation and remodelling needs — big or small. From modern updates to full renovations, my team and I are committed to delivering top-quality craftsmanship and personalized service you can trust. Let’s build something beautiful, from concept to completion! HG Contracting 📍 Based in Toronto & the GTA | ✅ Our Services Include: Home renovations & additions Kitchen & bathroom remodels Decks, fences & outdoor spaces Flooring, drywall, painting, trim work Commercial buildouts & maintenance Custom projects tailored to your needs 🔨 Quality workmanship – done right the first time 📅 Flexible scheduling and quick turnaround times

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  • Basement Waterproofing Specialist in Thornhill, Ontario

    With over a decade of hands-on experience, Reliance Restoration and Movers provides reliable, high-quality solutions for residential and commercial projects. Our skilled team specializes in concrete work, painting, decking, demolition, renovations, restoration, waterproofing with epoxy coating, sealant repairs, brick and block masonry, and general handyman services. We also offer moving assistance, junk removal, home repairs, and custom solutions for every type of project. Fully equipped with professional tools and a commitment to excellence, we ensure every job is completed safely, efficiently, and to the highest standards. Whether it’s a small repair, a major renovation, or a full-service move, Reliance Restoration and Movers is your trusted partner for quality, reliability, and results.

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  • Basement Waterproofing Specialist in Thornhill, Ontario

    I am a reliable and detail-oriented tradesman with experience in countertops installation, drywall, demolition, framing, and general handyman services. I focus on delivering high-quality work, fair prices, and excellent customer service. My priority is making sure every job is done right and that customers feel confident and satisfied with the results.

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  • Basement Waterproofing Specialist in Thornhill, Ontario

    With more than three decades of industry experience, FranMar Group is a multi-generation family business dedicated to exceptional workmanship and trusted service. From our grandfather’s foundation to our father’s leadership and now a new generation at the helm, our values remain the same: honesty, attention to detail, and quality above all else. We focus on delivering results that stand the test of time.

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  • Basement Waterproofing Specialist in Thornhill, Ontario
    • Best of Awards 2026
    • Best of Newly Listed 2022

    Pryde Group Corp company does quality construction services in Greater Toronto Area (GTA). Our company offers the following services for Toronto residents: Emergency drains services, Waterproofing, Underpinning, Drains, Concrete floors. Our main goal is to provide 100% quality services and earn the client’s trust. Years of experience in the construction of a wide variety of objects allows us to safely call ourselves experts. All our services are available 24/7 to residents of cities such as Toronto, Mississauga, Oakville, Burlington, Vaughan, Markham, Richmond Hill, Pickering, Brampton, Milton, Hamilton, Caledon, Aurora and other Greater Toronto Area (GTA) areas. Contact us today at 647.916.9046 for a FREE assessment! Your safety is our priority and we wear masks, gloves, and practice social distancing when in your home.

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  • Basement Waterproofing Specialist in Thornhill, Ontario

    Reliable, dedicated hardworking individual who puts customers and quality first.

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  • Basement Waterproofing Specialist in Thornhill, Ontario

    Your handy man at your service with over 12 years of experience. We provide the best, cleanest and fastet construction and carpentry services with the highest client satisfaction rates. -flooring -renovation - kitchen cabinets - fabric panel -furniture assembling Listed services are built with care and love for you to enjoy an easier life.

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  • Basement Waterproofing Specialist in Thornhill, Ontario

    Professional contractor has been working indoor and outdoor projects, such as full renovation, house extension, fence, deck and interlocking.

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  • Basement Waterproofing Specialist in Thornhill, Ontario

    Founders Built is a distinguished construction firm serving the Greater Toronto Area, known for our comprehensive approach to both commercial and residential projects. As reputable builders, contractors, and project managers, we pride ourselves on being a one-stop shop for all your property enhancement needs. With a steadfast belief that no project is too grand or modest, our slogan, "No job is too big nor small, Founders deal with it all," reflects our dedication to tackling every task with the highest level of professionalism and precision. Our mission is to deliver top-tier results, ensuring that every client’s vision is realized with the utmost quality and efficiency.

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4.7

Top rated Basement Waterproofing Specialists

Our Basement Waterproofing Specialists in Thornhill, Ontario, are rated 4.7 out of 5 based on 45 reviews from homeowners like you.

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What basement waterproofing services are available in Thornhill, Ontario?

Pros can waterproof basements from the interior, the exterior, or using a combination of techniques. The right service depends on whether you need full waterproofing or just touch-ups.

Here are some common basement waterproofing services in Thornhill, Ontario:

  • Installation of interior drainage systems: a perimeter drain installed along the interior footing collects and redirects water to a sump pit for removal.
  • Sump pump installation and replacement: often handled by a [plumber](https://www.homestars.com/plumbing/plumber-pros/Thornhill, Ontario), a pump installed in the sump pit removes accumulated groundwater and directs it away from the foundation.
  • Exterior waterproofing: excavation around the foundation allows for membrane application and drainage board installation to block water at the source.
  • Crack injection: epoxy or polyurethane foam is injected directly into foundation cracks to seal them against water intrusion.

No matter your needs, it’s easy to find basement waterproofing pros near you who can help. Just post your project on HomeStars now, and available contractors in your area can reach out!

What are the average costs of basement waterproofing pros in Thornhill, Ontario?

Basement waterproofing costs vary widely depending on the method, the size of the foundation, and where repairs are concerned, the extent of the damage. Labour typically runs between $50 and $150 per hour, depending on the service and complexity of the job. Materials and equipment, such as excavation machinery, may add additional costs.

Typical costs for common basement waterproofing services in Thornhill, Ontario:

  • Installation of interior drainage systems: between $3,000 and $10,000 for a full perimeter system in an average-sized basement
  • Sump pump installation and replacement: between $500 and $2,000 depending on pump type and whether a backup system is included
  • Exterior waterproofing: between $10,000 and $30,000 depending on foundation size and depth of excavation required
  • Crack injection: between $300 and $800 per crack depending on length, depth, and material used

HomeStars tip: To ensure you get the most accurate costs for Thornhill, Ontario, make sure to get everything written down in an itemized quote. This avoids misunderstandings and supports transparency and clear communication for both you and the contractor.

How to find basement waterproofing specialists in Thornhill, Ontario with HomeStars

Finding a basement waterproofing pro in Thornhill, Ontario can feel overwhelming, especially when water damage requires prompt attention. HomeStars makes it easy to connect with the right pro for your project. Just follow these simple steps:

  1. Start by posting your project. Provide a clear description of your basement waterproofing needs and, if possible, include photos to get precise quotes.
  2. Receive offers from available pros, review work history, and read customer feedback for basement waterproofing in Thornhill, Ontario.
  3. Connect with basement waterproofing specialists in Thornhill, Ontario to discuss your project, request and compare quotes, and ask any questions.
  4. Hire the right pro to get the job done and leave a review based on your experience.

HomeStars tip: Once your project is done, make sure to leave a review. Our review system ensures that pros are rewarded for good work and held accountable for any problems.

Pros on HomeStars undergo checks at registration – such as ID documents, company details, and certifications for regulated jobs and skill assessments – allowing you to hire with confidence.

Extra peace of mind with the HomeStars Confidence Program

The HomeStars Confidence Program is designed to give you added confidence when hiring through our platform. If your job qualifies under the Program and we determine that a claim meets the Program requirements, HomeStars may cover what you owe the Pro on an eligible job with a quote of up to CAD $10,000, in line with our terms and conditions.

FAQ: Common questions about basement waterproofing in Thornhill, Ontario

How long does basement waterproofing last in Thornhill, Ontario?

Most professional waterproofing solutions in Thornhill, Ontario are designed to last 10 to 25 years depending on the method used and the quality of installation. Sump pumps typically require replacement every 7 to 10 years.

Will waterproofing fix existing mould in my basement?

Waterproofing addresses the source of moisture but will not remove mould that has already formed. A separate mould remediation service is typically required before or after waterproofing work is completed.

What if my basement waterproofing project in Thornhill, Ontario requires excavation?

Exterior waterproofing projects in Thornhill, Ontario often require excavation around the foundation, which adds complexity, time, and cost to the overall job. It is important to work with pros who can coordinate this process effectively. [Local excavation specialists](https://www.homestars.com/gardening-outdoors/excavation-specialist-pros/Thornhill, Ontario) are available on HomeStars to walk you through what to expect and collaborate with your preferred basement waterproofing pro.

Does homeowner insurance cover basement waterproofing in Thornhill, Ontario?

In most cases, standard home insurance policies do not cover waterproofing as it is considered a maintenance issue rather than sudden damage. However, water damage resulting from a specific event such as a burst pipe may be covered. It is worth reviewing your policy or speaking with your insurance provider for clarification.

How do I know if a basement waterproofing pro is right for my project?

Not all waterproofing projects are the same, and finding a pro with the right experience for your specific situation is important. Reading reviews from homeowners who have had similar work done can help you make a more informed decision. Browse basement waterproofing pros on HomeStars to compare ratings and reviews from real homeowners in Thornhill, Ontario.

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