Cost of Waterproofing in Thornhill

The cost of waterproofing in Thornhill varies depending on several factors. These include the size of your basement, the extent of the problem, and the method of waterproofing chosen. It’s best to get a personalized quote from a reputable waterproofing company.

What causes basement cracks?

Basement cracks can be caused by a variety of factors. These include soil pressures, water pressure, terrain sloping towards your home, and foundation settlement or movement. It is important to get professional advice if you notice cracks in your basement.

What is the difference between exterior and interior waterproofing?

The key difference between exterior and interior waterproofing is where they are applied. Exterior waterproofing is done outside the home and serves as a barrier to prevent water from entering the property, while interior waterproofing primarily deals with managing the water once it has already entered the basement.

Is basement waterproofing beneficial for property value?

Yes, basement waterproofing is beneficial for property value. A dry basement is more usable, whether for living space or storage, and it mitigates potential issues such as mold growth. Future buyers often prioritize houses with waterproofed basements. It could become a unique selling point for your property.

What is the process of basement waterproofing?

In this video, our team of basement waterproofing contractors explained the process of basement waterproofing.

Wet Basement Repair & Prevention

Basement Waterproofing Thornhill

Aquamaster Basement Waterpoofing Thornhill offers a number of services to prevent & repair basement leaks, damp and wet basement problems. From wet basement repairs, interior & exterior waterproofing to basement underpinning and foundation repairs our team is here to help. Our clients choose Aquamaster because of the top quality services, flexible prices and a 25-year warranty.

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Award-Winning Waterproofing Contractor in Thornhill

If you need trusted basement waterproofing in Thornhill, Aquamaster is here to help. Get started with a special offer today!

Aquamaster - Thornhill Basement Waterproofing Experts

A wet basement can lead to structural damage, mold, and ongoing repair costs. AquaMaster handles basement waterproofing in Thornhill, helping you deal with leaks, flooding, and foundation issues before they get worse. With us, you get experienced crews, consistent results, and methods that match the conditions of your property. As a basement waterproofing company near you, we focus on stopping water at the source and keeping your basement dry long term.

Licensed & Insured Professionals – Work is completed by certified plumbers and waterproofing specialists experienced in wet basement repair in Thornhill.
Master Plumber License: T95-4200199
Plumbing Contractor License: T94-4200197

25-Year Warranty – All plumbing services are backed by a transferable 25-year warranty.

Trusted Thornhill Basement Waterproofing Experts – 15+ years handling basement leak repair in Thornhill and its surrounding areas.

Advanced Waterproofing Materials – We use tested materials designed for long-term foundation waterproofing.

From crack repair to full systems, you get professional waterproofing in Thornhill Ontario done with a clear plan and defined scope.

Protect Your Home With the Best Waterproofing Company In Thornhill

25-year transferable warranty, durable materials, trained crews, and free drain camera inspection included with every basement waterproofing in Thornhill project.

Our Basement Waterproofing Services in Thornhill

We provide Thornhill basement waterproofing services backed by a 25-year warranty. Materials are selected for long-term performance, and pricing is outlined before work begins. The scope depends on your foundation, layout, and the source of water entry.

Exterior Waterproofing Thornhill

Soil pressure and seasonal changes can cause foundation walls to crack and allow water to enter. Exterior waterproofing in Thornhill addresses the issue before it reaches your basement. We excavate around the structure, apply a waterproof membrane, and install drainage systems to direct water away. This method creates a long-term barrier and helps maintain the condition of your foundation over time.

Exterior Waterproofing Cost in Thornhill –
from $100–$350+ per linear ft

Interior Waterproofing Thornhill

Interior basement waterproofing in Thornhill is used when water is already entering the space or when exterior access is limited. We install drainage channels, sump systems, and moisture barriers to manage water from inside. Collected water is redirected away from your basement, reducing the risk of buildup, damp conditions, and recurring leaks. This method is often used for finished basements or properties with restricted access.

Interior Waterproofing Cost in Thornhill –
from $80–$180+ per linear ft

Weeping Tile Installation Thornhill

Weeping tile systems are designed to manage groundwater around your home. In areas with heavy rainfall or high water tables, pressure builds up against the foundation walls. A properly installed system collects this water and directs it away before it can enter. This reduces stress on the structure and lowers the chances of leaks forming over time.

Weeping Tile Installation Cost in Thornhill –
from $30+ per linear ft

Sump Pump Installation and Repair Thornhill

Flooding can happen quickly during storms or snowmelt. A sump pump system collects and removes water before it accumulates. We install and repair sump pumps to maintain consistent drainage and prevent water from rising to basement level. Backup systems can also be added to keep the system running during power outages or heavy demand periods.

Sump Pump Installation and Repair Cost in Thornhill – from $700–$4500+ per each

Window Well Installation Thornhill

Basement windows are often exposed to water buildup during heavy rainfall. Without proper drainage, water can collect and leak into the basement. Window wells create space for drainage and direct water away from the window frame. This reduces leak risks while also allowing more natural light and airflow into lower-level areas.

Window Well Installation Cost in Thornhill – from $1800–$3500+ per each

Backwater Valve Installation Thornhill

Sewer backups can occur during periods of heavy rain or system overload. A backwater valve is installed in your plumbing system to block reverse flow from entering your home. This helps reduce the risk of contamination and costly cleanup. It is especially useful in areas where flooding or sewer surges are more common.

Backwater Valve Installation Cost in Thornhill-
from $2200+ per each

Only 5-Star Reviews from
More Than 100 Happy Customers in Toronto

We’re the best waterproofing company in Toronto, as we offer exceptional service, an experienced and reliable team, competitive pricing, and a 25-year fully transferable warranty.

Aquamaster Basement Waterproofing Toronto

4.9

Based on 279 reviews

See all reviews Write a review

I wasn’t even sure if I had a real problem, just noticed the basement always felt a bit damp after rain. Aquamaster Basement Waterproofing came out and actually showed me what was going on behind the wall. The technician Albert explained that moisture was building up slowly and would get worse over time. They installed an interior drainage system with a sump pump and sealed everything properly. The job was clean and quick, and now the basement feels completely dry.

Кристина Олексиєнко

23:03 05 May 26

Didn’t think the issue in our basement was serious at first, just a bit of moisture near the wall. Aquamaster Basement Waterproofing came out and actually showed me that water was slowly getting in behind the surface. The technician (Kevin) explained everything clearly without overcomplicating it. They installed an interior drainage system with a sump pump and sealed the problem areas. After a couple of heavy rains, nothing — completely dry. Feels like it was fixed properly, not just covered up.

Nazar Merchanskyi

21:11 16 Apr 26

I wasn’t planning to do full waterproofing at first, just wanted to fix a small leak, but after talking to Aquamaster Basement Waterproofing it made more sense to do it properly. The guy who came out (I think his name was Alex) actually explained everything in a simple way without pushing anything. They installed an interior drainage system and sump pump, and sealed the problem areas. It’s been a few months now, including some heavy rain, and the basement is completely dry. Glad I didn’t go with another temporary fix.

Pr1 Vet

23:14 10 Apr 26

Aquamaster Basement Waterproofing helped us finally fix a long-standing issue with moisture coming through the basement walls. Mike and Daniel came out, did a proper inspection, and explained everything in simple terms. They installed an interior drainage system and sealed the problem areas properly instead of just covering it up. What I appreciated most is that they didn’t rush the job — everything was done carefully. Since then, even after heavy rain, the basement stays completely dry.

Sofiya Mkv

21:47 20 Mar 26

Aquamaster Basement Waterproofing handled our exterior basement waterproofing project with impressive professionalism. Andrew supervised the excavation process around the foundation and ensured that the landscaping and surrounding structures remained protected. A heavy-duty waterproof membrane was applied evenly across the entire foundation wall to provide long-term protection. New weeping tiles were installed with proper slope to direct groundwater away from the home. The backfilling and grading were completed carefully to ensure proper drainage.

Kiril Tarasov

02:42 18 Mar 26

Aquamaster Toronto handled our exterior basement waterproofing project with impressive technical expertise. Andrew supervised the excavation process carefully to avoid unnecessary disruption to our landscaping. A commercial-grade waterproof membrane was applied evenly across the entire foundation wall. A new weeping tile system was installed with proper slope to ensure effective groundwater redirection. Backfilling and grading were completed professionally, improving drainage around the home.

Маша Мирошниченко

04:28 27 Feb 26

Peter completed the exterior waterproofing about six months ago and we’ve had several heavy rains since then. The basement has stayed 100% dry. His work clearly lasts. Truly impressed.

Valar Gorgis

03:06 24 Dec 25

Amazing work from John and Peter. Had basement waterproofing done and the results were great. The team was professional, explained the process clearly, and finished on time. No more water issues. Highly recommend.

Annan Abu Salha

19:22 22 Dec 25

We chose Mike for exterior basement waterproofing and it was worth every dollar. The crew was on time, respectful, and did a thorough job sealing and protecting the foundation. Amazing value for the quality.

Gabriel Martinelli

16:29 22 Dec 25

I can’t thank Aquamaster enough for their outstanding service. They fixed multiple cracks in my foundation, waterproofed the interior walls, and installed systems to keep groundwater away from the house. The workers were skilled, considerate, and left the entire area neat and tidy. Since the repairs, the basement is dry, safe, and ready to use again — no more worries about mold or structural damage. Superb workmanship and customer care.

zlata

04:31 16 Dec 25

John was honest, reliable, and very skilled. He took care of the interior basement waterproofing and even showed us photos during the process. The results were perfect and the basement smells much fresher now. Fantastic technician!

Alex

00:58 16 Dec 25

Mike handled our interior basement waterproofing and was incredibly detailed. He showed us the problem areas, installed the drainage system perfectly, and made sure everything looked clean and professional. Zero water issues since. Excellent service!

Shafeeq Shafeeq

20:08 15 Dec 25

Mike and Peter did the exterior basement waterproofing on our home. Not only was the workmanship excellent, but the cleanup was spotless. You can tell they really care about their work. Highly recommend this company!

Omar Baqer

19:58 15 Dec 25

John performed our interior basement waterproofing and installed a new sump pump system. He arrived on time, worked quickly, and left everything clean. The difference is amazing—our basement feels dry and safe now. Very impressed with his workmanship.

Mustafa abed-ali

19:49 15 Dec 25

1. Aquamaster did an incredible job waterproofing my basement. The crew arrived exactly when they said they would, took the time to walk me through each step of the process, and worked with impressive focus and efficiency. After the heavy rain last week, water that used to seep in every storm didn’t even make it to the threshold — the basement stayed completely dry for the first time in years. They left the work area spotless and followed up to make sure everything was performing as promised. I’m beyond happy with the results and would recommend Aquamaster to anyone who’s had ongoing moisture issues.

Romina

01:46 26 Nov 25

Our window well was flooding constantly. Aquamaster sent out Mark and Anna. They replaced the drain, sealed the concrete, fixed the grading outside, and made sure everything worked before leaving. They even tested it with water to confirm the issue was solved. Super reliable team.

Назар Павлів

04:53 25 Nov 25

We had a leak in the corner of the basement after a storm, so we called Aquamaster. Alex and Julia came out the same week. They sealed the crack, dug outside to improve drainage, and checked the grading around the house. They even gave us maintenance tips so we wouldn’t face the same issue again. Amazing service and very polite team.

Галина Пустовіт

02:18 21 Nov 25

We contacted Aquamaster after discovering moisture behind our storage shelves. Daniel and Mark handled the repair. They were extremely professional — walked us through the entire waterproofing process, pointed out issues we never noticed, and explained how the foundation was shifting over time. They fixed the crack, sealed the base of the wall, added waterproof coating, and cleaned everything before leaving. The basement smells fresh now instead of damp.

_ МАКСИМ_

05:01 20 Nov 25

Thomas and Leo were incredibly efficient. They worked nonstop until the job was done and kept us updated the whole time. The basement has stayed completely dry since their visit.

Tokyo Ghost

01:58 19 Nov 25

Maria and Alex made everything so easy. Maria was very responsive and patient with our questions, and Alex’s team handled the work efficiently. They waterproofed the basement and fixed a leaking window well. Everything was done perfectly and on schedule. It’s such a relief knowing our basement is protected.

кіра

05:41 16 Nov 25

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Foundation Repair Services in Thornhill

Your foundation supports the structure above it. When cracks or movement develop, repairs need to be handled early to avoid further damage and water entry. We complete foundation repairs that address both structural concerns and moisture-related issues.

Basement Underpinning Thornhill

Underpinning is used to strengthen and stabilize your foundation while increasing basement height. Soil beneath the footing is excavated and replaced with reinforced concrete to support the structure. This process is often used in older homes or where settlement has occurred. It also creates additional usable space while improving overall structural support.

Basement Underpinning Cost in Thornhill – from $80 per sq ft

Bench Footing Thornhill

Bench footing is an alternative to underpinning when lowering the basement floor. A concrete ledge is constructed along the interior perimeter to support the foundation while allowing excavation of the floor. This method is more cost-controlled but reduces floor space slightly. It is often selected when full underpinning is not feasible due to budget or soil conditions.

Bench Footing Cost in Thornhill –
from $100 per linear foot

Basement Wall Crack Repair Thornhill

Cracks in foundation walls can allow water to enter and may indicate structural movement. We repair cracks using injection methods that seal the opening and block moisture from passing through. For larger or more complex issues, additional reinforcement methods are used to stabilize the wall and reduce further movement over time.

Basement Wall Crack Repair Cost in Thornhill – inside from $600+ outside from $1800+ per each

More Waterproofing and Plumbing Services in Thornhill

In addition to full basement leak repair in Thornhill, we handle drainage fixes, leak detection, sump upgrades and more. These services are often recommended when water entry is connected to drainage failure, sump discharge problems, damaged pipes, or hidden leaks.

Our Basement Waterproofing Process in Thornhill

Every project follows a clear structure. You know what’s being done and why at each stage.

Free Consultation & Inspection

We assess your basement and foundation to identify where water is entering and what needs to be addressed. This includes checking for cracks, drainage issues, and signs of pressure buildup around the structure.

Detailed Project Agreement

You receive a clear outline of the work, including method, cost, and timeline for your basement waterproofing in Thornhill. The plan is based on your property layout and the most effective way to address the issue.

Professional Installation & 25-Year Warranty

Work is completed using proven methods and backed by a 25-year transferable warranty for long-term performance. Final checks are completed to confirm the system is working as expected before the job is closed.

Why Trust Aquamaster for Basement Waterproofing in Thornhill?

You need work that holds up over time. AquaMaster has handled thousands of jobs across the GTA, including foundation waterproofing in Thornhill ON.

25-Year
Warranty

All qualifying work is backed by a transferable 25-year warranty covering both materials and labour for long-term reliability.

Emergency
Services

Our team is available to respond to urgent waterproofing and plumbing issues, helping reduce damage during unexpected situations.

Fully Licensed
and Insured

Work is completed by certified professionals trained in waterproofing, plumbing, and foundation repair across residential properties.

Upfront Pricing & First-Time Customer Discounts

You receive clear pricing before work begins, along with a first-time customer discount where applicable.

Trusted
Since 2009

With over 15 years of experience, we have handled a wide range of basement and foundation issues across the GTA.

Local Experience

We understand soil conditions, drainage patterns, and common causes of basement leaks specific to Thornhill properties.

Quality Materials

We use proven materials designed to handle long-term exposure to moisture and pressure around the foundation.

Consistent Project Handling

From inspection to completion, each step is handled by experienced crews following a clear and structured process.

What is the Cost of Basement Waterproofing in Thornhill

Thornhill waterproofing cost usually ranges from $80 to $350+ per linear foot. Interior systems fall between $80–$180+, while exterior waterproofing with excavation ranges from $100–$350+ per foot. All our basement waterproofing in Thornhill projects begin with a free estimate, so you know the scope before work starts.

Factors that affect pricing include:

Level of damage
Property size and access
Type of system used
Materials required
Scope of work
Foundation depth
Labour and installation
Crack repairs

Our Basement Waterproofing Projects in Thornhill

Finished Basement Waterproofing Projects in Thornhill

Soil type, drainage, and foundation design all impact the plumbing work required. Our basement waterproofing in Thornhill projects include interior systems, exterior excavation, sump installations, and structural repairs. Each job is planned based on what your property needs, not a fixed template. You can review past work to see how wet basements are addressed across different property types in the GTA.