location_on Serving Greater Montréal & surroundings Emergency water infiltration? Call (514) 979-5425Same-day availability
Foundation Repair Montreal

Certified Foundation Repair Experts in Montreal

Protecting Montreal homes from water infiltration and structural damage for 12+ years.
RBQ certified · SOPREMA certified applicator · Free inspection, no obligation.

Same-day quotes available · No obligation · Bilingual team (EN/FR)
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★★★★★
4.9 / 5 Google
engineering
500+
Projects completed
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RBQ
Licensed contractor
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SOPREMA
Certified applicator
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12+
Years in Montreal
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RBQ Certified Contractor
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SOPREMA Certified Applicator
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Fully Insured
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In-House Team (No Subcontracting)
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Manufacturer Warranty on Materials

Foundation Repair Services in Montreal

From emergency water infiltration to full French drain installations — our certified team handles every foundation challenge in the Greater Montreal area.

plumbing

French Drain Installation

Interior and exterior perimeter drainage systems. SOPREMA-certified installation with minimal excavation — ideal for densely built Montreal neighbourhoods.

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Foundation Crack Repair

Polyurethane and epoxy injection for hairline and structural cracks. Permanent sealing from the inside — no exterior excavation required in most cases.

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Basement Waterproofing

Interior membrane waterproofing systems using SOPREMA materials. The industry gold standard for Quebec foundations — comes with manufacturer warranty.

foundation

Foundation Wall Repair

Structural reinforcement and stabilization for bowing, cracking, or settling foundation walls. We diagnose root causes, not just symptoms.

hardware

Garage Floor Drains

Custom drain installation in galvanized metal. We cut, remove, and reinstall with proper slope and drainage — a Sous-Sols Experts specialty.

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Emergency Water Infiltration

Active leak in your basement? We locate the source fast, stop the water, and document the damage in full for insurance purposes.

Why Montreal Homeowners Choose
Sous-Sols Experts

We've repaired 500+ foundations across Greater Montreal. Here's what separates us from other contractors.

01 · Materials

SOPREMA Certified Applicator

SOPREMA is the gold standard in Quebec foundation waterproofing. As certified applicators, the materials we install come with a manufacturer warranty — not just our word. Many contractors use cheaper alternatives. We don't.

Manufacturer Warranty Included
02 · Experience

12+ Years Montreal Experience

We know every neighbourhood's soil conditions, the seasonal freeze-thaw patterns that crack Montreal foundations, and the building codes for every borough. Local knowledge isn't a slogan — it's what prevents mistakes.

500+ Completed Projects
03 · Coverage

Greater Montreal Coverage

We cover the full Greater Montreal area: Île de Montréal, Laval, South Shore, West Island, and Repentigny. If you're a Montreal homeowner, we come to you — no extra travel fees for most zones.

Greater Montreal + Repentigny
04 · Communication

Fully Bilingual Team

Full service in English and French. You'll understand exactly what's happening at every stage of your project. No misunderstandings, no surprises. This matters when you're spending $10,000+ on your home.

English & French

Our Foundation Repair Process

Four clear steps from first call to finished project. No guesswork, no surprises.

01

Free Inspection & Diagnosis

Our certified technician visits your property, identifies the root cause of your water issue, and documents everything with photos and measurements.

02

Written Quote

Detailed, itemized written quote within 24 hours. You see exactly what we'll do, which materials we'll use, and what it costs. No surprises, no hidden fees.

03

Professional Installation

SOPREMA-certified installation by our own in-house team. We never subcontract your foundation work. Same team you met at inspection does the job.

04

Post-Work Walkthrough

We walk you through every inch of the completed work, provide your warranty documentation, and answer all your questions before we leave.

What Our Clients Say

Real reviews from Montreal homeowners who've trusted us with their foundation.

verified Google Review
★★★★★

Pietro di Benedetto and Sous-Sols Experts provided the best possible solution to my foundation problems. The work included excavation, a reinforcing concrete wall, waterproof sealing, a French drain, sump pump, and a new exterior stairwell drain that solved problems I'd had for over thirty years. All completed to a very high standard, and at exactly the price promised.

BT
Brian Trehearne
Montréal, QC
verified Google Review
★★★★★

Pietro is one of the most honest, trusting professionals I have ever come across. His work is impeccable — garage floor, sump pump, new drains, all done to the highest of standards. There was no cutting corners and no BS. You are appreciated by me and my family.

DM
Donna McFarlane
Montréal, QC
verified Google Review
★★★★★

I was highly impressed with Sous-Sols Experts. Mr. Di Benedetto met his deadline, his team was courteous, did a good job, and cleaned up afterward. I am very pleased with the result. I strongly recommend them for any water-related issues.

MT
Mike T.
Montréal, QC
star Happy with our work? Leave us a Google review

Foundation Repair Across Greater Montreal

Our certified team serves the entire Greater Montreal region. Don't see your city? Call us — we likely cover it.

Longueuil
Brossard
Boucherville
Saint-Lambert
Terrebonne
Blainville
Saint-Eustache
Dollard-des-Ormeaux
Pierrefonds
Pointe-Claire
Verdun
LaSalle
Lachine
Saint-Laurent

Get Your Free Foundation Inspection

No obligation. A certified technician will contact you within one business day to schedule your free on-site inspection anywhere in Greater Montreal.

Your information is never shared with third parties.

schedule Open 24 hours

Frequently Asked Questions

Everything you need to know about foundation repair in Montreal.

Foundation repair costs in Montreal vary based on the type and extent of the damage. Minor crack repairs typically range from $500–$2,000. A full French drain installation ranges from $8,000–$20,000+ depending on the perimeter and site conditions. Basement waterproofing projects typically run $5,000–$15,000. We provide free, detailed written quotes — contact us for an accurate estimate tailored to your property.
Duration depends on scope. Foundation crack injections can often be completed in a single day. A full perimeter French drain installation typically takes 2–5 days depending on basement size and access conditions. Basement waterproofing projects range from 1–4 days. We provide a detailed project timeline in your written quote so you know exactly what to expect.
For most interior foundation repair work, you can remain in your home. Our team works efficiently and contains the work area to minimize disruption. For exterior excavation work, you may need to temporarily move vehicles or items near the work zone, but you can typically stay inside. We discuss all logistics clearly during the inspection and before starting any work.
A French drain (drain français) is a perforated pipe system installed around your foundation perimeter to redirect groundwater away from your basement. You likely need one if you experience recurring water infiltration, damp basement walls, floor efflorescence, or visible seepage during spring thaw or heavy rain. Sous-Sols Experts installs French drains both interior (along the basement floor perimeter) and exterior (excavated around the outside of the foundation), using SOPREMA-certified materials.
Yes, significantly. Water infiltration issues are among the top reasons buyers back out of Montreal home deals. A documented, professionally completed foundation repair — especially with SOPREMA materials and an RBQ-certified contractor — adds transparency and buyer confidence. Many of our clients specifically mention that their real estate agent recommended foundation work before listing. It's one of the highest-ROI repairs a Montreal homeowner can make.

Get Your Free Foundation
Inspection Today

Join 500+ Montreal homeowners who've trusted us with their foundation. No obligation, same-day availability in most areas.