Protect Your Markham Home from Costly Foundation Cracks and Water Damage
Discover certified waterproofing systems built to stop leaks, stabilize your foundation, and keep your home safe for decades.
Built Right. Beneath the Surface.
When water begins to seep into your basement, it’s more than an inconvenience — it’s an early warning that your home’s foundation is under threat. In Markham, where soil conditions and heavy rainfall combine with older infrastructure, moisture often finds its way into the spaces you rely on most.
At SDM Contractor, we specialize in protecting homes from the ground up. Our certified waterproofing systems stop leaks at their source, prevent structural deterioration, and ensure your home stays strong, dry, and secure year after year.
We believe protection shouldn’t be a guessing game — it should be a proven process.
Why Waterproofing in Markham is Essential
Markham homeowners face unique waterproofing challenges. The region’s clay-heavy soil expands when wet and contracts when dry, putting constant pressure on foundations. Pair that with frequent freeze-thaw cycles and seasonal rainfall, and it’s easy to see why so many homes develop cracks, leaks, and flooding issues.
Ignoring these early warning signs can lead to:
- Foundation cracking and wall bowing
- Mold growth and poor indoor air quality
- Basement flooding and water pooling
- Long-term structural damage and lost property value
Professional waterproofing isn’t just about fixing leaks — it’s about protecting the foundation of your home and everything it holds.
Our Proven Waterproofing Process
Every home has a different story. That’s why our approach starts with understanding what’s happening beneath yours. At SDM Contractor, we combine diagnostic expertise with industry-leading methods to deliver solutions that last, not patches that fail.
We start with a thorough inspection using moisture detection tools and visual mapping. Our team identifies where water enters, how it moves through your foundation, and what damage has already occurred.
Every assessment is documented with images and a clear explanation — so you understand exactly what we’re seeing and how we’ll fix it.
No two homes — or leaks — are the same. Based on your foundation type and condition, we recommend one or a combination of the following:
Interior Waterproofing
- Designed for finished basements or minor water seepage
- Installs an interior drainage system and vapor barrier
- Includes sump pump installation to remove groundwater
- Cost-effective and minimally invasive
Exterior Waterproofing
- Excavation around the foundation to expose the wall
- Application of waterproof membrane and new weeping tile
- Crack sealing and structural reinforcement
- Long-term protection from hydrostatic pressure and ground seepage
Additional Protection Services
- Foundation Crack Injections — epoxy or polyurethane sealing for localized repairs
- Sump Pump & Backwater Valve Installation — prevents flooding and backup
French Drain Systems — directs surface water away from foundation walls
SDM Contractor’s waterproofing systems are installed exclusively by in-house certified technicians — never subcontractors. Each system meets or exceeds Ontario Building Code standards, with multiple quality checkpoints throughout the project.
We stand behind every job we complete with multi-year warranties and post-installation documentation, so you know your investment is protected.
Why Markham Homeowners Choose SDM Contractor
Homeowners across Markham and the GTA rely on SDM because of our honest communication and dependable workmanship. From the first call to the final inspection, you’ll know what’s being done, why it’s needed, and what it will cost — upfront.
Certified to Protect
Our waterproofing methods are engineered to last. Whether it’s a 30-year-old foundation or a new build, our materials and installation techniques are designed for structural stability, moisture prevention, and compliance.
Transparent, Itemized Pricing
We provide detailed, line-by-line quotes — no vague “extras,” no hidden costs. Every client receives a clear scope of work, timeline, and warranty coverage before any project begins.
Local Knowledge That Matters
We’ve waterproofed homes across Markham — from Unionville and Thornhill to Greensborough, Milliken Mills, and Cornell. We know the soil, the weather patterns, and the building codes. That local expertise allows us to predict potential risks before they cause damage and tailor our systems accordingly.
From Leaking Basement to Solid Ground in Unionville
Challenge:
A 1980s home in Unionville had visible foundation cracks and recurring basement leaks every spring. The homeowner had patched it multiple times, but the issue kept returning.
Our Solution:
- Full perimeter exterior waterproofing system
- New weeping tile and gravel drainage bed installation
- Crack injections and membrane sealing
- Sump pump installation for backup protection
Result:
The homeowner’s basement has remained completely dry through every season since. Their property value increased, and they later finished the basement into a secondary suite with confidence.
“SDM’s team was professional, honest, and efficient. They explained every step and finished ahead of schedule. The difference is night and day — our basement is finally dry.”
— L. Tran, Unionville Homeowner
Health, Comfort, and Long-Term Protection
Moisture doesn’t just damage concrete — it affects the health of everyone inside the home. Persistent dampness can lead to mold spores, allergens, and poor air quality that spread throughout your living spaces.
By sealing and waterproofing your basement, you protect your home’s structure and your family’s wellbeing — reducing allergens, improving air quality, and preventing long-term deterioration.
Frequently Asked Questions
The cost depends on your home’s foundation and the waterproofing method. Interior systems typically range from $3,000–$8,000, while exterior waterproofing averages $8,000–$15,000.
Yes. A dry, structurally sound basement significantly improves resale value, home inspection results, and overall buyer confidence.
Yes. Every SDM waterproofing system comes with multi-year warranties that often exceed industry standards.
Do you assist with City of Markham rebate programs?
Yes. We guide homeowners through available municipal subsidy programs for sump pumps and backwater valves.
We proudly serve:
- Markham (Unionville, Greensborough, Cornell, Thornhill, and Milliken Mills)
- Toronto, Vaughan, Richmond Hill, Mississauga, Oakville, Brampton
- Durham and York Regions
Wherever you live, our mission is the same — lasting work, honest value, and certified protection for your home.
Whether you’re seeing early signs of dampness or dealing with flooding after rain, SDM Contractor is here to help. Schedule your free inspection today and discover how our certified systems protect your home from water intrusion, foundation cracks, and costly repairs.
SDM Contractor – Certified to Protect
Protect your home. Preserve your peace of mind.
