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We are specialists in Basement Lowering, Foundation Reinforcement, and Basement Waterproofing
across Toronto and the GTA.

What You Can Do With Basement Underpinning

Basement lowering offers remarkable transformations.
Discover what’s possible beneath your home.

Book a FREE Assessment

Raise Your Basement Ceiling

Turn low, cramped basements into full-height living areas.

Add a Walkout Basement

Create backyard access and bring natural light to your basement.

Convert a Crawl Space

Replace wasted space with a strong, usable lower level.

Stabilize Your Foundation

Strengthen aging or sinking structures from the ground up.

Protect Against Water Damage

Add waterproofing and drainage to keep your basement dry year-round.

Prepare for a Home Addition

Reinforce your foundation to support major renovations, home extensions, and additions.

What Our Clients Say

Read through 5-star reviews from homeowners and general contractor who have chosen our underpinning services.

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Jessica P.
7 months ago
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Stronghold Underpinning has converted our useless 6-ft crawlspace into 8-ft beautiful living area! It feels like we have added a whole new floor to our home! Thank you for your high-quality work!

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David
5 months ago
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We live in Mississauga, and we found a huge foundation crack, and we were terrified that the house was settling. Stronghold Underpinning came in, explained the engineering behind the process, and stabilized everything. Their attention to detail and the way they handled the city permits took all the stress off our shoulders. Highly recommend this team!

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James and Sonya
3 months ago
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After getting four different quotes for basement underpinning, we went with these guys because they were the most transparent about the cost, and didn’t push us for fast decisions. Great work from the beginning till the end. We are very satisfied with the outcome.

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Chris
2 months ago
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Best basement lowering service in the city, hands down. We needed bench footing and foundation reinforcement for our home. f you need a reliable underpinning contractor who knows the local building codes inside and out – call Stronghold Underpinning. This team knows what they are doing!

100% Locally Owned, Serving Toronto and GTA

At Stronghold Underpinning, we specialize in providing professional basement underpinning services for clients in Toronto and the GTA. With over 10 years of experience, our licensed and insured team has completed 180+ underpinning projects across the GTA.

We offer free structural consultation, full liability insurance, and a 25-year labour and materials warranty on our services. Whether you’re stabilizing an aging foundation or converting a crawl space into a livable space, we bring years of expertise, pricing transparency, and accountability to every job.

What You Can Expect From Our Underpinning Contractor in the GTA

NO loss in structural strength

Engineer-approved design

NO wall cracks or water leaks

Excavation and waterproof sealing

NO broken plumbing or wiring

Utility line mapped and protected

NO missed deadlines

Inspection at every stage

NO uncertainty

Site assessment and clear pricing

Basement Underpinning starts at $70–$100/sq ft

The cost of basement underpinning varies based on project’s complexity, soil conditions, size of perimeter, depth and more. Contact us to get a detailed quote for your underpinning project.

Get a FREE DETAILED Quote

Licensed & Insured Experts

Over 10 Years of Experience

Highest Quality Guaranteed

Free, No-Obligation Quotes

Warranty on Labor & Materials

Underpin Your Basement With Us!

Call us or fill out the form to learn more about our underpinning process, pricing and ongoing offers! We reply fast and offer outstanding services in Toronto and the GTA.

Professional Basement Underpinning Services in Toronto and the GTA

We specialize in underpinning to reinforce and stabilize your home’s foundation. Our team ensures a safe and effective process to expand your basement space or secure an aging foundation.

Basement Underpinning

Although strong at first, your foundation slowly loses structural integrity as time goes on and needs to be reinforced. Our team is happy to provide you with professional underpinning and basement-lowering services allowing you to reinforce the foundation and increase the ceiling height of your basement. Additionally, you can avoid foundation settlement brought on by aging structures or shifting soil, guaranteeing the integrity of your house for the long run.
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Bench Footing Toronto

Another option for lowering your basement is called bench footing. This service offers a practical and cost-effective alternative. Bench footing involves creating a ledge or bench along the basement walls. This adds stability and increases the ceiling height. This process is particularly ideal for partial basement adjustments.

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Basement Walkout Contractors in Toronto

Have an idea about a basement walkout? We guarantee that your basement walkout is both functional and comfortable. Adding a separate entrance or upgrading an existing one can be done efficiently by our basement underpinning contractors.

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basement additions

Basement Additions Toronto

Do you need to expand your home's footprint? If yes, basement addition services might be just what you need. We add extra space below the ground and create new spaces that can later be developed into new living areas. Adding a new work zone or a comfortable space to relax is easy as our basement additions will allow you to efficiently increase your property’s size and value the way you want it to be done.

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What You Might Want to Know About Basement Lowering

Basement underpinning is a major investment of both money and time. You need to be informed about the process, pricing, timelines and expectations of the project. Take a look at the most frequently asked question, and if you haven’t found the answer, simply contact us.

The mass concrete underpinning method is one of the cheapest underpinning method in Toronto. It involves digging small sections beneath your foundation in stages and pouring new concrete to extend the footing deeper.

In Toronto, basement lowering typically costs $70 to $100 per square foot. Total project pricing is influenced by the desired depth, soil stability, site accessibility, and the total square footage. A standard 1,000 sq. ft. basement project often ranges from $75,000 to $120,000 including permits.

Yes, a basement floor can be lowered without underpinning by using the bench footing method. This technique involves leaving the original foundation walls intact and creating a concrete “bench” around the interior perimeter to support the structure. It is an ideal alternative when soil conditions are stable or when working with shared party walls.

A typical basement underpinning project in Toronto takes 4 to 8 weeks. The exact timeline depends on the basement size, soil type, and how much the floor is being lowered. Larger or more complex projects that include waterproofing, plumbing relocation, or concrete slab work may extend to 10+ weeks.

Best time for basement underpinning is between April and October when Toronto’s weather is warm and dry. While spring through early fall is most efficient for excavation, professional contractors can perform underpinning year-round by utilizing specialized heating equipment and moisture-control barriers during winter months.

Common signs that a house needs underpinning include diagonal cracks in interior drywall, exterior brick gaps, and uneven or sloping floors. These cracks on the surface indicate that the issue might have been progressing for some time and the best course of action is to call professionals to assess your foundation.

Yes, homeowners can typically remain in their house during underpinning, although it depends on the amount of tear and the overall scope of the project. The process involves heavy excavation, you should expect significant noise, vibrations, and dust. For projects involving total basement lowering, your water or sewer lines may be temporarily disconnected for 2–3 days. If you have a high sensitivity to noise or work from home, a temporary relocation is recommended during the most intensive digging phases.

Yes, basement underpinning in Toronto can increase a home’s market value up to 25%. By converting a crawlspace into a full-height living area, you are effectively adding an entire floor of square footage. Additionally, underpinning provides a “permanent structural fix” that appeals to buyers, as it resolves foundation issues that would otherwise hinder a sale during a home inspection.

Underpinning alone does not fix leaks, but the process provides the perfect opportunity to install a permanent waterproofing system. During underpinning, contractors can install new interior weeping tiles, high-performance drainage membranes, and a sump pump. This combination addresses the root cause of dampness, hydrostatic pressure, more effectively than surface-level “damp-proofing” ever could.

Our underpinning contractors will come to your house to assess the situation and determine what needs to be done for your foundation, how much that would take and the cost. With site-specific soil analysis, We evaluate whether your foundation sits on Toronto’s expansive clay or sandy silt to decide between traditional mass concrete underpinning or bench footing.

#1 Basement Underpinning Services in Toronto and the GTA

We’re fully licensed and insured, backed by steady 5-star feedback, and focused on your safety and confidence.

Get a FREE quote

186+ Reviews

5-Star Service Promise

Our recent blog

Underpinning vs. Benching – How to Choose the Right Basement Lowering Method?

If the basement in your Toronto home feels more like storage than usable space, and the low ceiling makes renovation...
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We offer foundation work in Toronto and across the GTA

Toronto’s foundation challenges are unique. Dense clay soils, fluctuating moisture levels, and high water tables can put pressure on basement walls and weaken existing footings over time. Our underpinning methods are specifically designed for local soil behavior, ensuring every excavation stays stable, dry, and structurally sound.

Whether your home sits on heavy clay in East York or near high groundwater in Etobicoke, we provide engineer-approved solutions that strengthen your foundation and protect against shifting or leaks.

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