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Strong Basements Inc.- Toronto Basement Experts!

Strong Basements Inc. Basement Lowering, Underpinning, Waterproofing, Concrete Floor, Walkout construction Toronto and GTA

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Strong Basements Inc. is a full-service basement construction company serving Toronto and Ontario for more than 20 years. We handle every stage of basement improvement and foundation reinforcement, from small repairs to full structural transformations. Our services include engineering and building permitting, basement lowering, underpinning, interior and exterior waterproofing, drainage upgrades, concrete floor installation, walkout construction, basement additions, and structural steel work for open-concept layouts and increased load capacity.

Main Services

Our Basement Lowering services cover everything from engineering drawings, building permits, and excavation to structural underpinning, steel installation, waterproofing, drain rough-ins, sewage ejector, sump pump, and concrete floors.

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Basement underpinning and lowering in Toronto to increase ceiling height and reinforce the foundation.

With expert contractors and certified engineering oversight, we ensure every project is safe, code-compliant, and built to last.

The cost of basement lowering in Toronto typically ranges from $90 to $100 per square foot, or about $380 per linear foot of underpinning, depending on the size of the project and site conditions. At Strong Basements, we handle all major underpinning methods, including non-shrink, overpour, L-shape, and bench underpinning, so we can match the right approach to your home’s structure. Basement lowering is one of the most effective ways to gain usable space, add comfort, and increase property value. For detailed explanations of each underpinning type and the full basement lowering process, please visit our Basement Underpinning page.

Our basement walkout service covers the full scope of the project, including: engineering, design, building permits, excavation, concrete construction, insulation, waterproofing, drainage, sump pump installation, doorway cutout, framing, and all required structural support. 

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Newly constructed basement walkout in Toronto with a separate exterior entrance.

A basement walkout adds valuable living space by giving the basement a safe, direct entrance to the outdoors. It is also a must for anyone planning a separate basement unit or a legal basement apartment, as a dedicated exterior exit is required for safety and code compliance. Our team builds walkouts across Toronto and handles the engineering plan, survey, and building permit from the start. A standard basement walkout costs about $25,000 for construction, plus the engineering and permitting fees. A properly built entrance improves home value, increases natural light, and makes outdoor areas such as patios, decks, or stair landings more usable. For a full breakdown of the process, requirements, and pricing, visit our Basement Walkout Construction page for more detailed information.

Our complete service includes demolition, excavation, foundation coating, waterproof membrane installation, weeping tile systems, sump pump installation, and full water damage restoration.

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Basement waterproofing protects the structure of your home and keeps moisture from damaging the foundation. Our team is IICRC-certified in Water Damage Restoration, which allows us to work directly with insurance companies and simplify the claims process for homeowners. Choosing certified specialists means the work is done correctly, with materials and methods that last.

For homeowners comparing options, here are the standard rates we provide:

  • Exterior foundation waterproofing: $30 per sq. ft. when the wall is below grade and requires full excavation and membrane installation.

  • Interior waterproofing system: $70 per linear foot.

  • Complete sump pump system installation: $1,900.

Investing in proper waterproofing prevents long-term structural issues, avoids recurring moisture problems, and protects your home’s value. If you’re planning to finish your basement or already see signs of water seepage, addressing the problem early can save you from far more costly repairs in the future.

We provide expert Concrete Floor services in Toronto, including old slab demolition, excavations, waterproofing, drain replacement, and new rough-ins, gravel bedding, insulation, in-floor heating, moisture barriers, steel wire mesh, concrete pouring with pump, and professional concrete polishing.

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Whether you’re replacing an old basement slab or installing a new concrete floor from scratch, we focus on solid workmanship and long-lasting performance. Our crew handles everything from demolition to finishing, following current Ontario building standards and practical design expectations for modern homes.

For basements that need a full slab replacement, the cost is about $30 per square foot. If the floor has already been excavated and only needs a fresh pour, the average price is around $10 per square foot of basement area.

Homeowners choose us because we work cleanly, follow proper curing practices, and deliver floors that stay level, dry, and durable for years. Our certified concrete specialists manage each step with proper safety procedures and consistent quality, so you get a reliable finished product you can build on.

Service Prices

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Strong Basements underpinning and basement lowering contractors in Toronto providing excavation, foundation reinforcement, and concrete floor installation.
TORONTO LICENSED & CERTIFIED
TORONTO BUILDING RENOVATOR LICENSE: T85-4754041
TORONTO PLUMBING CONTRACTOR LICENSE: T94-4891681

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25 YEAR WARRANTY!
FOR ALL BASEMENT WATERPROOFING, DRAIN & FOUNDATION WORKS
TRANSFERABLE!

Our Rescent Projects

Basement Underpinning in Toronto

Basement lowering and addition construction in Toronto with excavation, underpinning, and structural preparation for expanded living space.
Basement underpinning in Toronto, Sections N3 showing excavation, footing support, and structural reinforcement before concrete pour.

Basement Underpinning & Addition Project – Blackthorn Ave, Toronto

Strong Basements Inc. recently completed a comprehensive basement underpinning and addition project at Blackthorn Ave, Toronto (M6N 3H5). The existing basement had deteriorated foundation walls that required immediate structural reinforcement.

Structural Reinforcement

  • The structure was stabilized with jack shores while all old wooden beams were removed and replaced with a poured concrete strip on top of the block foundation walls. To restore strength, we applied parging across the foundation walls and embedded four steel posts into the existing structure.

Basement Underpinning & Expansion

  • We executed L-Shape underpinning sections flush with the foundation walls, minimizing the bench and maximizing usable basement space. The project included extending the basement 8 feet to the front and 15 feet to the rear. Using a combined method of cinder block walls and underpinning allowed us to avoid costly excavation shoring, saving the homeowner approximately $50,000.

Waterproofing & Drainage

  • A full interior waterproofing system was installed, including wall membranes, perimeter weeping tile, and a sump pump. On the exterior, we added a backwater valve and a new drainage system to protect against flooding.

Concrete Floor Installation

  • We insulated the subfloor, laid radiant heating pipes, and applied a vapour barrier with steel mesh reinforcement. Finally, a 4-inch, 32 MPa reinforced concrete slab was poured, delivering a durable and long-lasting basement floor.

Basement Underpinning & Foundation Stabilization – King St, Mount Albert, ON

Strong Basements Inc. recently completed a structural underpinning project at  King St, Mount Albert (L0G 1M0). The home stood on soft ground with a high underground water table, causing the southern foundation wall to crack and sink. While one engineering company proposed a solution as costly as building a new house, we delivered a proven foundation underpinning system that was 15 times more affordable.

Innovative Structural Underpinning

  • We began by underpinning the section of wall designated for the conveyor belt opening. After installing steel braces, we cut through the foundation wall, set up the conveyor, and started excavation. The damaged floor and soil around the weakened foundation were removed.
  • To reinforce the footing, we embedded epoxy-coated steel rebars into the existing concrete and built a 15mm steel rebar mesh tied to dowels. Then we poured a 4-foot-wide, 2-foot-deep, 35 MPa reinforced concrete footing along the original base, interlocked with rebar dowels. This expanded the structural footprint four times, preventing future settlement.

Waterproofing & Crawl Space Insulation

  • After strengthening the foundation, we fully waterproofed and insulated the crawl space, ensuring the home remains safe, dry, and energy-efficient.

Cost-Effective Foundation Underpinning in Ontario

  • This project shows how Strong Basements specializes in basement underpinning, structural underpinning, and foundation underpinning solutions that restore safety and stability without unnecessary costs.
  • If you are dealing with foundation settlement or cracked basement walls, our team provides engineered, cost-efficient solutions across Toronto and the GTA.

Basement Underpinning & Structural Upgrades at Georgina Ice Palace, Keswick ON

Project Overview

The Georgina Ice Palace in Keswick, Ontario – a popular municipal ice arena – recently underwent a basement underpinning and structural upgrade project to support major facility improvements. Strong Basements, a specialist in foundation reinforcement and arena construction, was subcontracted through CIMCO Refrigeration to execute this complex project under the oversight of the City of Georgina. The upgrade was driven by the need to install new indoor ice melt systems and modernize the ice rink’s infrastructure. Working within a public-sector environment meant strict compliance with municipal building codes, careful coordination with city officials, and a tight summer off-season schedule to minimize disruption to arena operations.

Scope of Work

The project’s scope was comprehensive, addressing both structural integrity and water management for the ice rink foundation. Key components of the work included:

  • Construction of new ice melt wells – Two large indoor snowmelt pits were built to collect and melt ice resurfacer shavings, forming a core part of the upgraded ice melt systems.

  • Underpinning – The existing foundation was underpinned to increase its depth and strength, ensuring the arena’s structure could safely accommodate the new pits and equipment.

  • Excavation and rebar reinforcement – Significant excavation was required to create space for the pits and deeper footings. Steel rebar cages were installed in all new concrete works to provide robust structural reinforcement.

  • Installation of steel posts and I-beams – New steel load-bearing posts and I-beams were added to support the building during wall modifications and to carry additional structural loads.

  • New drainage system – A modern drainage network (including weeping tiles and sumps) was integrated to handle meltwater and prevent water accumulation.

  • Concrete waterproofing – All new and existing foundation walls were coated with waterproof membranes and cementitious sealants to waterproof the basement concrete against moisture intrusion.

  • Wall cut-out – An opening was cut through a foundation wall to integrate the new snowmelt pits with the arena floor. This was done only after the wall section was securely underpinned and braced, maintaining structural stability during the cut.

Project Outcome and Benefits

This structural reinforcement and upgrade project was completed on schedule and met all the City of Georgina’s requirements for safety and quality. By the end of the summer construction window, the Georgina Ice Palace’s infrastructure was significantly improved and ready for the fall reopening. The newly underpinned foundation and steel reinforcements have enhanced the building’s structural integrity, extending the lifespan of this important community facility. The addition of modern indoor ice melt pits has streamlined arena maintenance by efficiently handling ice waste, a feature that improves operational efficiency for arena staff. Furthermore, the comprehensive basement underpinning and concrete waterproofing measures have fortified the arena against groundwater intrusion and seasonal freeze-thaw effects, which is crucial for a public ice rink facility.

Strong Basements’ professional execution of this project highlights their capability in delivering complex arena construction upgrades in collaboration with public-sector partners. The close coordination with CIMCO and city inspectors throughout the process ensured that each phase—from excavation and underpinning to waterproofing and final concrete pours—was done in compliance with strict standards. The Town of Georgina now benefits from a safer, more resilient ice rink foundation and improved ice maintenance systems, all achieved with minimal disruption to the community. This case study stands as an example of how specialized basement underpinning, structural reinforcement, and waterproofing solutions can be successfully applied to upgrade and preserve essential recreational infrastructure

Why Choose Us for Your Basement Construction?

Strong Basements Inc., Toronto’s trusted specialists in basement conversionbasement underpinning, lowering, concrete floor, and waterproofing.
We help homeowners across Toronto and the GTA transform low, unused basements into safe, comfortable, and valuable living areas.

With years of local experience, licensed engineers, and a proven record of successful basement construction, excavation, and structural projects across Toronto, Strong Basements delivers results that meet Ontario Building Code standards, ensuring your investment is both safe and long-lasting.

Licensed and Insured Contractor

Fully licensed and insured in Ontario for underpinning, waterproofing, and structural foundation work. All projects comply with the Ontario Building Code and City of Toronto permit requirements.

Engineering and Permitting Expertise

Our in-house team coordinates with structural engineers and city inspectors, handling drawings, permits, and inspections to make the process stress-free for homeowners.

Full-Service Basement Construction

We manage every stage — from excavation, underpinning, and waterproofing to drainage, plumbing upgrades, and new concrete floors.

Structural Safety First

All basement construction is done sequentially in engineered stages, ensuring the existing structure remains stable and supported at every step.

Experience in Toronto’s Housing Stock

Extensive experience working with older Toronto homes and diverse soil and foundation conditions found across neighborhoods like Leaseide, Etobicoke, Baby Point, East York, High Park, and North York.

Transparent Pricing and Detailed Estimates

Homeowners receive clear cost breakdowns before the project begins — no surprises, just honest, itemized pricing.

Proven Results and Client Trust

Over 100+ successful basement underpinning and lowering projects across the GTA. We take pride in our craftsmanship and long-term customer satisfaction.

Free Consultation and Estimate

Schedule a no-obligation site visit to evaluate your basement and receive a professional assessment with design options and recommendations.

Basement Construction Reviews

EXCELLENT
Google star 1Google star 2Google star 3Google star 4Google star 5.0.7
Based on 27 reviews
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Anna Frolov profile picture
Anna Frolov
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We recently hired Strong Basements for a full basement lowering and underpinning project at our home in Etobicoke, and we couldn’t be happier with the results. Denis and his team were extremely professional, organized, and tidy throughout the entire process. They handled everything from the drawings and building permits to the actual underpinning, waterproofing, installation of a new drain system, and pouring a brand-new concrete floor. The new floor is perfectly level, very smooth, and honestly looks fantastic. Price-wise, they were in the mid-range compared to the other quotes we received, but the quality of their work for that price is outstanding. You really feel like you’re getting top-tier craftsmanship without the premium mark-up. Overall, highly recommend Strong Basements Inc. if you’re looking for reliable, skilled, and professional contractors. Denis and his crew truly delivered.

Owner's reply
Thank you for sharing this detailed review. I truly appreciate that you took the time to describe your experience. Working on your Etobicoke home was a straightforward and well organized project, and I am glad to hear that the entire basement underpinning and lowereing process turned out the way you expected. Basement lowering is never a simple job, and it is encouraging to hear that the results made the effort worthwhile. Your comments about the quality of the concrete finish and the overall value mean a lot to our team. We put a lot of attention into keeping the site clean, staying organized, and making sure each stage is done properly, and it is good to know that this was noticed. Thank you again for trusting Strong Basements Inc. with this project. If you ever need guidance or future work, you are always welcome to reach out.
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Inna Aronin profile picture
Inna Aronin
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This review is long overdue. Strong Basement did waterproofing and repaired a crack in my crawl space last fall. It was really tough work, the crawl space has a very low ceiling, and once the soil was dug out, things didn’t go exactly as planned. Denis and his team adjusted right on the spot, no drama, no extra $$, just elegant solutions. They also kept everything moving with the other subcontractors (scheduling garbage bins, cement trucks, and more), with no delays. His crew was just as impressive: professional, not afraid of hard work, and incredibly fast. Denis (the owner) deserves his own spotlight! He is patient, a true listener, and takes time to explain everything in simple, clear words. He gave me confidence through a very stressful project and showed real care for both the work and the client. They were reliable, hardworking, and professional. Thankyou Denis and the Team. I’m grateful our paths crossed!

Owner's reply
Thank you Inna so much for taking the time to share your experience with our team. We are truly grateful for your kind and detailed words. We well remember your project. Underpinning a foundation to prevent a house from sinking, especially in challenging sandy soil with elevated groundwater, is complex and demanding work. It truly was a tough job, and we sincerely appreciate you highlighting how Denis and the crew adapted on the spot when faced with the unexpected. Our main goal is to navigate those challenges and provide clear, drama-free solutions to give our clients peace of mind through what can be a very stressful process. Hearing that Denis's communication gave you confidence and that you found our crew to be professional and hardworking means a great deal to us. Thank you once again for trusting Strong Basements with such a critical project for your home. It was a pleasure to work with you, and we're so glad our paths crossed! All the best, Denis and the Team at Strong Basements.
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Peter Zajaczkiwsky profile picture
Peter Zajaczkiwsky
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Denis is extremely professional and polite. Everything was done on time and priced fairly. I would highly recommend them to anyone looking for underpinning!

Owner's reply
Thank you, Peter. I appreciate your feedback and your trust in our work. I am glad the project was completed on schedule and to your expectations. Your recommendation means a lot to us.
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Mimi Chung profile picture
Mimi Chung
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Reliable and professional. I called for an estimate and Dennis scheduled and confirmed our appointment. He gave a thorough and professionally sound assessment of our issue, luckily we didn't need any work done but I would definitely trust him with the job if there was.

Owner's reply
Thank you Mimi, for sharing your experience! We're glad Denis could provide a thorough and professional assessment for you. Even though no work was necessary this time, we appreciate your trust in us and look forward to potentially assisting you in the future. Your confidence in our reliability and professionalism is greatly valued!
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Matheus Fróes profile picture
Matheus Fróes
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Just wrapped up another project with Strong Basements, focusing on basement underpinning and installing an insulated concrete floor this time. Living in Etobicoke, I’ve seen my share of home improvement projects, but the professionalism and quality of work from these guys stand out. From the beginning, Denis was incredibly helpful, providing a detailed and transparent estimate that offered great value for the money. Despite the complexity of the work, especially with the underpinning, his team managed to keep everything on track. We did encounter a couple of hitches along the way due to the nature of our home's foundation, but the way Denis and his crew handled these issues was impressive. They ensured that all solutions were thoroughly explained and executed with precision. Big thanks to Denis and everyone at Strong Basements Inc. for their dedication and for turning what could have been a stressful process into a smooth and satisfying experience. Highly recommend their services if you're looking to upgrade your basement with a team that goes above and beyond.

Owner's reply
Thank you, Matheus, for your wonderful review! We're delighted to hear about your positive experience with our basement underpinning and insulated concrete floor installation in Etobicoke. Your acknowledgment of Denis's helpfulness and our team's professionalism means a lot to us. We appreciate your recommendation and are glad we could make your project smooth and satisfactory. Looking forward to serving you again!
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Anastasia Mazanova profile picture
Anastasia Mazanova
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Working with Strong Basements for my Etobicoke home's basement concrete flooring was the right decision. Not only was their team highly professional and detail-oriented, but the pricing was also very competitive compared to other quotes I received. The quality of work is truly outstanding, with a strong focus on customer relationships. Denis provided a clear, thorough consultation, walking me through every step of the process. I'm impressed by the durability and finish of the concrete floor. For anyone in Toronto looking for high-quality concrete basement flooring at a great price, I highly recommend Strong Basements.

Owner's reply
Dear Anastasia Mazanova, Thank you for your wonderful review and for choosing Strong Basements for your Etobicoke home's basement concrete flooring project. We're delighted to hear that you found our team to be highly professional, detail-oriented, and competitively priced. At Strong Basements, we strive to deliver not just outstanding work quality but also to foster strong customer relationships by providing clear, thorough consultations and understanding each client's unique needs. Denis and the rest of our team are thrilled to know that you are satisfied with the durability and finish of your concrete floor. It's our goal to ensure every project we undertake meets our high standards for quality and customer satisfaction. We're grateful for your recommendation to others in Toronto seeking high-quality concrete basement flooring. Should you or anyone you know require our services in the future, please don't hesitate to reach out. Thank you again for your trust in Strong Basements, and we look forward to the opportunity to serve you again. Best regards, Strong Basements' Team.
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Tony Huang profile picture
Tony Huang
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
Wife had called a few companies and most of them struggled with setting up a visit for a quote. Strong Basements was very punctual, responsive and helpful in our first meeting. Denis walked us through what was required and put us in touch with all the personnel required. Job ran long, as most renovations do, but his team was more than equipped for the task. He was able to solve any problems that arose. Renovations are never easy, for the customer or the contractor but Denis was very hardworking and open about the process. Would definitely recommend to anyone else look to underpin or waterproof.

Owner's reply
Dear Tony Huang, Thank you for your thoughtful review and for choosing Strong Basements for your underpinning and waterproofing needs. We're delighted to hear about your positive experience with Denis and our team. Punctuality, responsiveness, and thorough communication are pillars of our service, and it's rewarding to know these aspects stood out to you and your wife. We understand that renovations can extend beyond expected timelines, and we appreciate your patience and understanding as we navigated through the challenges that arose. Our team is committed to finding effective solutions and ensuring the job is done right, even when unforeseen issues come up. Hearing that you would recommend our services means the world to us. We're here for you and anyone in your network who may need assistance with basement underpinning or waterproofing projects in the future. Your trust and support motivate us to continue delivering high-quality work and maintaining open lines of communication with our clients. If there's anything more we can do for you, or if you have any further projects in mind, please don't hesitate to get in touch. Warmest regards, Strong Basements' team.
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Mark Oliver profile picture
Mark Oliver
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Good basement waterproofing contractors. High quality work and materials, professional and polite employees. I satisfied with the price and service approach i have got from this company. The reason of the four star rating is that it took them one day longer to complete the job then it was promised. But anyways I definitely will recommend strong basements to anyone with basement waterproofing problems.

Owner's reply
Dear Mark Oliver, Thank you for taking the time to share your feedback about our basement waterproofing services. We're thrilled to hear you appreciated the quality of our work and the professionalism of our team. It's always our goal to provide top-notch services at a fair price, and we're glad that resonated with you. We understand that the project took a day longer than anticipated, and we sincerely apologize for any inconvenience this may have caused. Timeliness is crucial in our line of work, and we're constantly looking for ways to improve our efficiency without compromising on quality. Your feedback is invaluable in that process. We're honored that you would recommend Strong Basements to others facing basement waterproofing issues. If you or anyone you know needs further assistance, please don't hesitate to reach out. We look forward to serving you again in the future! Best regards, Strong Basements' team.
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Ashley Malcovich profile picture
Ashley Malcovich
Google star 1Google star 2Google star 3Google star 4Google star 5Trustindex verifies that the original source of the review is Google.
Good guys do the good job. I have got basement waterproofing done in my place by Strong Basements. It was a massive water leak in my basement. Now it is dry for a year, with no signs of water. Thanks.

Owner's reply
Dear Ashley Malcovich, Thank you for your wonderful review and for choosing [Your Business Name] for your basement waterproofing needs. We're thrilled to hear that our team effectively addressed the massive water leak in your basement, ensuring it's been dry for a year with no signs of water. Our commitment is to provide top-quality waterproofing solutions that deliver lasting results, and your feedback reaffirms the hard work we put in every day. We're here for any future needs or to assist anyone you know who may benefit from our services. Thanks again for trusting us with your home! Best regards, Strong Basements' Team.