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Basement Underpinning, Floor Lowering Toronto

Not your Average Experts, Toronto's Best

Welcome to Aquamaster. If you are looking for a job done right, you've come to the right place. 

Built to Last for Decades

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Why you Need Basement Floor Lowering?

Welcome to Aquamaster

The one logical question that every homeowner always asks themselves before undertaking a home improvement project is “Why?” When it comes to basement lowering the answer is twofold. Whether its ceiling height that you’re looking to increase, or you want to turn that impractical basement into a functional space, or you’re looking to move on to bigger things and want to increase your home’s market value – no matter how you look at it, you gain.

More often than not, basement underpinning is carried out at properties with insufficient basement headroom.

The basement underpinning process (known as lowering) is rather complex, but with the right company taking care of the details the work can be done with a minimum amount of disruption to the homeowner.

Process of Basement Floor Lowering

Basement Underpinning - How it Works?

There are several steps in the process of underpinning and we handle all of the details during each stage of the project. Before any work actually gets underway, new floor plans and structural modifications must be documented with a new floor plan.

Planning - the planning stage must include an engineer and architect. We have access to experienced engineers and architects that will work with you to plan your new space and apply for all of the proper permits to begin the work. Because underpinning requires moving and extending the load bearing walls under the house, having the right permits and municipal approval is a legal necessity.

Please note that no project will be carried out without the required permits and stamped architectural/engineering drawings.

Preparation - once the planning stage is completed, and the appropriate permits issued, preparations are made for the actual underpinning job. These preparations include rerouting the connections to your furnace so that heating pipes are out of way. Additionally, temporary support structures, including vertical jacks, have to be installed to ensure the structure of the house remains stable during the basement lowering construction.

Basement Underpinning (Floor Lowering) - The existing concrete floor has to be removed and the soil excavated to a proper elevation. Once that’s done, we are ready to proceed with the underpinning. The perimeter of the basement is divided into sections numbered 1, 2, and 3. First, sections # 1 are dug out, then filled with concrete, a two inch space must be left between the newly poured concrete and the original foundation, then this gap is filled with non-shrink grout. The same procedure is followed for sections # 2 and # 3.

Now that your new foundation walls are in place, old plumbing can be removed, and new plumbing put in its place. You will be provided with new plumbing rough-ins that will enable you to create your desired space. At this point we will install a reliable waterproofing system to make sure your basement stays dry, it consists of internal weeping tiles, a waterproofing membrane and a sump pump. To get ready for the pouring of the new concrete floor we evenly place four to six inches of gravel throughout the basement. Finally, a new concrete slab is poured. Once the concrete is dry, your new basement is ready to use!


Basement Floor Lowering - Where to Start?

How to Get Started?

  • Get in touch with Aquamaster Drain Plumbing & Waterproofing Inc. to book a free consultation.

  • We will provide you with an architect/engineer to obtain permits OR you may find one yourself.

  • The architect/engineer will obtain permits and will expedite them according to the client’s timeline.

  • Set the commencement date for the project.

If you are interested in basement underpinning, please get your 20% offer or reach out to us directly over the phone or through chat. Our team will be happy to discuss your project!

It is a complicated project that must be done properly to prevent damage to the rest of the house. The staff at Aquamaster has helped thousands of customers in Toronto and GTA to lower their basements to turn an unusable crawl space into a beautifully finished room.

Why Choose Us?

3,000+ Happy Clients Chose Aquamaster


True Warranty Coverage

Work, meterial and labour for 25 years. Fully transferable from owner to owner.

24-Hour Emergency

Our emergency team is available 24 hours a day.


Licensed & Insured

Aquamaster team is fully licensed & insured to work in plumbing, concrete, underpinning and waterproofing.



We offer all our clients 10% Off their first Aquamaster service. Get the offer today!

In Business Since 2009


We've been around for a while. We will be around for a lot longer!

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Proudly Serving South Ontario

Aquamaster team is proudly serving multiple locations in Toronto, GTA and multiple locations in Sothern Ontario.


Best Materials

We always choose high quality materials because we want to provide high quality service. 


Peace of Mind

Our service is well-thought through, so you don't have to worry about it!

Don't Take Our Word for It!

What Our Clients Say?


Stephanie G.

Residential Client

I used Aquamaster for two separate home waterproofing projects and I was extremely satasified with their work and price. Their team are highly skilled, thorough and were able to complete the 10.5 hour job in one day. They were even kind enough to seal my window frame after I noticed a minor leak. I would highly recommend Aquamaster for all your waterproofing and plumbing needs.

The Aquamaster team is absolutely fantastic! They went above and beyond to diagnose and correct the problem that I had with my basement plumbing caused by old pipes and persistent tree roots. I used them once in 2012 and in 2020. I cannot say enough good things about this team - Highly recommend.


Felicia F.

Residential Client


Chris D.

Residential Client

Aqua Master quoted me a very fair price for waterproofing and finshed the job ahead of schedule. We haven't had any water issues in our post-war hm since then. Highly recommend this business for its professionalism and quality of work. Hire with confidence!

How it Works?


Discovery Call

Connect with one of our certified experts, so we can advise on the best way to approach your project.


On-Site Survey

More complex projects require on-site surveys, where a certified Technician will provide a no-obligation estimate.



We sign a contract that outlines details of your project.



We do the work, you get peace of mind and a 25-year transferable warranty.

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What are your Service Areas?

Proudly Serving Southern Ontario and Beyond





King City

York Region














Get Started with 10% Off Today!

Unparalleled quality service, 25 years warranty, all available today with 10% off.

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