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Signs of a Wet Basement in London & Southwestern Ontario Homes
Ontario’s freeze-thaw cycles, heavy spring thaws, and dense London clay soil put constant pressure on your foundation. Many homeowners don’t realize their basement is leaking until the damage is expensive. Spotting these warning signs early can save you thousands in repairs and protect your home’s value.
Damp or Discolored Walls
Dark patches, water stains, or white powdery residue (efflorescence) on concrete blocks or poured walls are classic signs of water seeping through. In London homes, this often appears after heavy rains or snowmelt.
Musty Odours or Mold Growth
That persistent damp smell is mould and mildew thriving in hidden moisture. Ontario basements are especially prone to this because of our humid summers and cold winters.
Peeling Paint or Bubbling
Paint that flakes, bubbles, or pulls away from the wall means moisture is pushing from behind — a very common issue in Southwestern Ontario homes.
Water Stains or Puddles on the Floor
Even small puddles near walls or in corners after rain are red flags. Many homeowners notice this at the wall-floor joint first.
Cracks in Foundation Walls or Floor
Horizontal, vertical, or stair-step cracks (especially widening ones) can let water pour in. Freeze-thaw cycles in our region make these cracks worse every year.
Efflorescence (White Chalky Powder)
This mineral deposit left behind when water evaporates is one of the most reliable signs of active water intrusion through your foundation.
Our Basement Waterproofing & Foundation Repair Solutions
At DMCON Inc., we provide complete basement waterproofing and foundation repair solutions across London and all of Southwestern Ontario. From fast interior systems and permanent exterior waterproofing to crack repair, helical piles, and sump pumps — we deliver the right fix for your specific problem.
Fast, non-invasive solution with perimeter drain tile, high-capacity sump pump, and battery backup. Perfect for finished basements or when you want minimal disruption.
INTERIOR WATERPROOFING
The most permanent fix — full excavation, heavy-duty waterproof membrane, new weeping tile, gravel, and backfill. Stops water before it enters your home.
EXTERIOR WATERPROOFING
High-pressure epoxy and polyurethane injection that permanently seals cracks and stops water intrusion. Structural carbon fiber reinforcement also available.
Foundation Crack Repair
Reliable primary and battery backup sump pumps plus regular maintenance programs to protect your basement during heavy Ontario rains and snowmelt.
Sump-Pump Installation
Restore clogged or damaged weeping tiles, French drains, and sewer lines using advanced trenchless pipe milling. Removes roots, scale, and heavy buildup without digging — keeping your basement dry and your drainage system working perfectly.
Pipe Milling & Repair
Stops sinking, shifting, or bowing foundations quickly and with minimal disruption. Works perfectly alongside our waterproofing systems.
Helical Pile Foundation Stablization
Why Southwestern Ontario Homeowners Choose DMCON for Basement Waterproofing
A
Full-Service Foundation & Waterproofing Experts
Unlike most companies that only do waterproofing, we also specialize in excavation, helical pile foundation repair, and structural work. This allows us to fix both the water problem and any foundation issues at the same time.
B
Lifetime Transferable Warranties
All our waterproofing work comes with a lifetime transferable warranty. If you sell your home, the protection goes with it.
C
Deep Regional Expertise
Hundreds of successful basement waterproofing projects completed from Lake Huron to Lake Erie. Whether you’re in a major city or a smaller town throughout the region, you’re working with a company that truly understands local conditions and delivers reliable, permanent results.
D
High-Quality Work & Clean Job Sites
We treat every home like our own. Our crews leave your property clean and tidy after every job.
E
Trusted by Residential, Commercial & Municipal Clients
DMCON Inc. proudly serves a wide range of clients across Ontario — from residential homeowners and commercial property owners to restoration companies, investment groups, and municipalities. Our experience working with both private homes and larger-scale projects gives us the expertise to deliver reliable, high-quality basement waterproofing and foundation solutions for any type of property.
How Much Does Basement Waterproofing Cost in Ontario?
The cost of basement waterproofing varies depending on the size of your basement, the severity of the water issue, and whether you need an interior, exterior, or combined solution. Here’s a general guide based on 2026 pricing in our region:
Interior Basement Waterproofing
$150 – $175 per linear foot
Typical Project: $8,000 – $18,000
Fast & non-invasive system with drain tile and sump pump
Best For: Homes with limited outside access, unfinished basements, and less severe water problems where you want a faster, cleaner installation.
Exterior Basement Waterproofing
$220 – $275+ per linear foot
Typical Project: $15,000 – $35,000+ Permanent solution with excavation and waterproof membrane.
Best For: Homes with major water intrusion, structural foundation issues, and homeowners wanting the gold standard permanent fix.
Foundation Crack Repair
$2,500 – $8,000
High-pressure injection to seal cracks permanently.
Best For: Active water leaks through foundation cracks and minor structural issues.
Sump Pump Installation + Backup
$2,500 – $5,500
Reliable flood protection for your basement.
Best For: Homes that experience occasional water entry or want extra flood protection.
Pipe Milling & Weeping Tile Repair
$3,500 – $9,000
Trenchless cleaning and restoration of clogged drains.
Best For: Clogged drainage systems with roots, scale, or blockages without full excavation.
Foundation Underpinning with Helical Piles
$15,000 – $45,000+ (Price varies by number of piles needed)
Advanced helical pile system to permanently stabilize sinking, shifting, or bowing foundations. Can be combined with basement waterproofing for a complete structural + water solution.
Best For: Homes with foundation settlement, cracking walls, uneven floors
Frequently Asked Questions About Basement Waterproofing
Here are answers to the most common questions we receive from homeowners across the region.
A: Most interior jobs take 2–4 days. Exterior projects usually take 5–10 days depending on scope and weather.
A: Yes. All our basement waterproofing work comes with a lifetime transferable warranty. The warranty stays with the home even if you sell it.
A: Absolutely. We specialize in both. We can perform helical pile underpinning, crack injection, and other structural repairs while solving your water issues
A: Yes. We use advanced pipe milling (trenchless technology) to restore clogged weeping tiles and drains with minimal disruption.
A: Usually not. Most interior waterproofing can be done while you live in your home with very little disruption.
A: Most interior jobs take 2–4 days. Exterior projects usually take 5–10 days depending on scope and weather.
A: We typically schedule assessments within 1–3 business days.
