Interior Basement Waterproofing in Toronto

Aquamaster Waterproofing has been helping households prevent and repair issues caused by basement water leaks since 2009. Ask our experts how our interior basement waterproofing Toronto can protect your property and safeguard your investment.

Award-Winning Waterproofing Contractor in Toronto

Signs Your Basement Needs Interior Waterproofing in Toronto

Toronto basements are prone to moisture invasion through groundwater, heavy rain, melting snow, and aging foundations. When moisture begins creeping in, it’s often subtle until it isn’t; and you’re left with costly repairs. This is why it’s so important to frequently check your basement for moisture problems. Interior waterproofing solutions in Toronto help protect your basement before minor problems balloon into structural damage or mold hazards. Aquamaster is your trusted waterproofing expert in Toronto, stopping moisture from ruining your basement.

Here are some of the most common warning signs that your basement needs interior waterproofing:

Water seepage on the floor where it meets the wall
Damp or wet basement floors
Concrete cracks on walls
Efflorescence (white powdery residue) on walls
Musty smell or visible mold growth
Peeling paint or bubbling drywall
Rust on metal or rotting wood
High humidity that doesn’t improve
Persistent damp air

If you notice any of these signs, you must act quickly because your basement is likely experiencing water issues underneath the slab or foundation walls. Interior waterproofing provides a reliable internal drainage system to redirect water away from your basement and protect your home.

Why Choose Interior Waterproofing

There is a lot of emphasis on exterior waterproofing. Many homeowners fear water invasion from outside the home. But fully protecting your basement means considering internal leaks and implementing solutions that provide complete protection.

Interior basement waterproofing is one of the most effective and affordable ways to manage moisture inside the foundation. Instead of digging outside your home, which is part of exterior waterproofing, internal waterproofing focuses on capturing water and redirecting it away from the foundation.

Internal waterproofing is also great for Toronto homes with shared foundations, limited yard access, or finished exteriors. Protecting your home through interior waterproofing is one of the best things you can do as a homeowner.

The benefits of interior waterproofing include:

It is more cost-effective compared to exterior excavation
Can be done year-round, including winter installations
Solves water leaks and prevents future seepage
Gets rid of any musty odors and moisture buildup in the basement
Protects finished basements against mold and water damage
Includes sump pump and other internal drainage solutions
Does not cause any damage to exterior landscaping

Our Finished Interior Waterproofing Projects

We’ve completed hundreds of successful Toronto interior waterproofing projects. Explore our results:

Only 5-Star Reviews From More Than 100 Happy Customers

Aquamaster Basement Waterproofing Toronto

4.9

Based on 261 reviews

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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

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

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

We couldn’t be happier with Aquamaster Waterproofing. David and Mike handled the entire project from inspection to final cleanup. They repaired our cracked foundation, sealed the basement walls, and added proper drainage. The work was neat, efficient, and done ahead of schedule. The peace of mind they’ve given us is priceless.

Liza 14

02:45 10 Nov 25

We had a major basement flooding issue, and no one could figure it out—until we called Aquamaster Waterproofing. Sarah and David were thorough during the inspection and found that our sump pump had failed. They replaced it, installed a backup pump, and added better drainage around the foundation. The system works flawlessly now, and our basement has been dry ever since. Five-star service from a truly reliable company.

Mercury

02:16 10 Nov 25

We recently moved into an older home and discovered water coming through the floor in the basement. Aquamaster’s team, led by Alex and David, came right away for an inspection. They installed a sump pump, sealed all visible cracks, and made sure our drainage system was working correctly. The workers were polite, neat, and extremely knowledgeable. It’s rare to find a company that combines great service with such high-quality workmanship. I’m beyond satisfied with the results.

Bogdan Perekatov

04:37 08 Nov 25

David and John from Aquamaster did an excellent job fixing our wet basement. They explained the problem clearly and provided a permanent solution. The quality of their work is unbeatable.

Тарас Назарко

04:50 06 Nov 25

Maria at the front office was so kind and helpful, and Daniel’s crew did flawless work sealing our foundation cracks. We can finally enjoy our basement again. Five-star company through and through.

Usman Mohammad

04:56 04 Nov 25

The crew from Aquamaster did an incredible job. They were very detail-oriented and made sure everything was done properly. I was impressed by their professionalism and care. My basement is completely dry now.

Ильченко Валерия

01:48 29 Sep 25

Aquamaster completely fixed my leaky basement. The crew—Mike and Peter—were fantastic. They worked quickly, cleaned up after themselves, and made sure everything was perfect. I highly recommend this company.

A Zhoravovych

03:54 28 Sep 25

Great service from Aquamaster! They installed a sump pump in my basement and waterproofed the walls. The workers—Andrew and Tom—were very friendly and helpful. Everything is working perfectly, and I’m so glad I called them.

Володимир

05:39 27 Sep 25

Aquamaster went above and beyond to repair my basement foundation. The crew was on time every day, respectful, and very skilled at what they do. They explained the whole waterproofing process so I could understand it clearly. Now my basement is bone dry and I couldn’t be happier.

Женя Топ

03:42 23 Sep 25

Waterproof Basement exceeded my expectations. Mike and Chris did a full basement waterproofing job, and they were incredibly detail-oriented. They sealed every crack, installed a drainage system, and explained the warranty thoroughly. My basement is now dry and comfortable, and I couldn’t be happier with the service.

kofein

03:56 30 Aug 25

We were very pleased with the work done by Aquamaster. The team was professional, worked hard and stayed late to finish the job faster than expected. I would highly recommend Aquamaster. Thank you.

Alida

23:24 19 Aug 25

I highly recommend Aquamaster. Mark and Roman repaired our foundation wall, added waterproof coating, and extended our downspouts. They did more than promised and for the same price. That kind of integrity deserves recognition.

Valeriia Solomko

00:36 18 Aug 25

Our neighbor recommended Aquamaster after they fixed his leaky wall. Now we’re recommending them too! 5 stars.

Катя Данькова

04:15 06 Aug 25

Fast, friendly, and flawless. Aquamaster did an outstanding job and made the whole process easy for us. Would give more than 5 stars if I could!

Коротницька Марія

05:41 31 Jul 25

I usually don’t leave reviews, but Aquamaster earned this one. Everything was smooth, professional, and respectful. You can tell they really care about doing quality work.

Valymir Zhezherun

04:59 31 Jul 25

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How Interior Waterproofing Works

Our basement waterproofing internal solution focuses on relieving hydrostatic pressure and providing a path for water originating inside the basement to be deposited away from the foundation. We install an internal drainage system to guide water outside.

Here’s what the process looks like:

01. Inspection and moisture test

The first step we take is assessing your basement to determine whether there are any moisture problems and to what extent. We identify leaks, water trails, humidity issues, and foundation cracks.

02. Concrete trench cutting

This is a narrow trench we create along the interior perimeter of the basement floor that diverts water away from your basement and deposits it in a designated area.

03. Installation of internal drainage

After we’ve mapped out the pipe routes and the trench has been created, gravel is added and a perforated weeping tile system is laid inside the trench to collect water.

04. Sump pump integration

The internal drainage guides the water into a sump basin. The water level triggers sensors that engage the pump, which discharges water efficiently outside.

05. Foundation wall waterproofing barrier

This system is made up of waterproof membranes and coatings that are installed to seal walls and prevent moisture from seeping into the basement through the concrete.

06. Cement restoration

The rest of the trench is filled with gravel and re-cemented to conceal the trench and provide a clean and finished look.

07. Optional crack injection

Polyurethane or epoxy injections are highly effective solutions that permanently seal any structural cracks in the foundation walls. Interior crack injection is cost effective and noninvasive.

This complete interior waterproofing approach keeps your basement dry. It prevents future leaks, improves the health and comfort of your family, and makes your home more durable.

How Much Does Interior Waterproofing Cost in Toronto?

Toronto interior waterproofing typically costs $80–$300 per linear foot, with most projects ranging from $3,000–$18,000+. It’s often up to 50% more affordable than exterior waterproofing and can be completed faster with minimal disruption. Final pricing depends on the size and accessibility of your basement, the length of internal drainage required, whether a sump pump is needed, any crack repairs or wall membrane upgrades, and the severity of existing moisture damage. Aquamaster offers customized pricing after a free on-site consultation.

Interior vs. Exterior Waterproofing: What’s the Difference?

Factors	Interior Waterproofing	Exterior Waterproofing
Application	Active leaks and finished basements	Severe exterior water pressure
Cost	$80 – $300 per linear foot	$100 – $300+ per linear foot
Installation	Fast, indoor access	Requires excavation
Goal	Control water after it enters the basement	Block water at the foundation source

Why Choose Aquamaster for Interior Basement Waterproofing Toronto?

Aquamaster is your trusted local full-service waterproofing company with over a decade of expertise in protecting Toronto homes. Our goal is to keep your basement dry and provide safety, comfort, and peace of mind. We provide:

25-year transferable warranty on interior waterproofing systems

24/7 emergency services

Transparent pricing

Permanent waterproofing solutions

Trusted Since 2009

Team of 20+ certified waterproofing specialists

FAQ about Interior Waterproofing

How Long Does Interior Waterproofing Take in Toronto?

Most projects take 1–3 days, depending on the scope, basement size, and system features.

What are the best interior basement waterproofing products?

We use:

Interior drainage weeping tile systems
Heavy-duty waterproof membrane
High-performance sump pump units
Polyurethane crack injection sealants

What is the best interior waterproofing system?

The best interior waterproofing approach is a combination of internal drainage, wall membranes, and sump pump. This ensures water is controlled and redirected appropriately.

How long does the interior waterproofing last?

Our installations are designed to last 25+ years when properly maintained. We offer a 25-year transferable warranty on all waterproofing work.

Will interior waterproofing stop mold?

Yes. By eliminating moisture and improving air quality, we prevent mold from forming or spreading.

Can interior waterproofing be installed in a finished basement?

Absolutely. We make sure that we protect your flooring, furniture, and interior finishes during the installation.

What are your location?

Service Area

We proudly provide interior waterproofing services across Toronto and the GTA, including:

Start Your Interior Basement Waterproofing in Toronto Today!

For over a decade, Aquamaster has proudly served Toronto, the GTA, and surrounding areas in Southern Ontario, providing basement waterproofing, plumbing services, drain cleaning, sump pump and backwater valve installations, drain camera inspections, and underpinning (basement lowering). Our commitment to quality and customer satisfaction has made us a trusted choice for interior basement waterproofing, supported by competitive pricing, price matching, and special offers like 10% off your first waterproofing project and a 5% senior discount. Contact us today to request your free estimate and take advantage of our current offers.