Covering the stain won't cut it — the leak just comes back next storm. DrainCom finds where water's actually getting in, then repairs that: the crack, the failed weeping tile, or the leaky window well.
choice for licensed and insured basement waterproofing services in Mississauga, Canada.
When your basement is wet and you’ve already been burned by a patch that didn’t hold, you want proof before you pick up the phone. Over 20 years, we’ve earned a 5 out of 5 on HomeStars across more than 800 reviews, repaired over 20,000 homes, and sealed north of 10,000 foundation cracks. The stubborn leak in your basement isn’t a new one to us.
for a free drain inspection and quote, or fill out the request form at the top of this page.
Foundation cracks are the number-one cause of basement leaks in Mississauga. Water pushes through them after heavy rain or spring snowmelt. We seal the crack to stop water at the entry point.
Wall leaks usually start when hydrostatic pressure forces water through weak spots in the foundation. We pin down where it’s coming in and deliver a permanent repair that keeps your basement dry.
Water coming up through the floor usually points to high groundwater or drainage trouble under the foundation. We inspect the real cause and recommend the right fix instead of guessing.
Concrete foundations in Mississauga crack and weaken as they age, and those openings let water seep in. We handle concrete foundation leak repair to restore the strength and waterproof integrity of your foundation.
Older weeping tile clogs or breaks down over time. When drainage fails, water builds up around the foundation and leaks follow. We repair or replace weeping tile system to get water moving away again.
Poor drainage around a window well lets rainwater leak straight through your basement window. We fix the well and improve the drainage to head off future water intrusion.
A sump pump is your first line of defence against a flooded basement. We install a new sump pump and repair a faulty pump in mississauga to clear groundwater before it reaches your floor.
Some basements keep leaking because groundwater pressure stays high. An interior drainage system collects that water and sends it to a sump pump, keeping the space dry for good.
When water keeps coming through the foundation walls, exterior basement waterproofing in Mississauga is often the lasting fix. We excavate around the foundation, repair the wall, and install a membrane that stops water before it reaches your basement.
A sudden leak can wreck your basement and belongings in hours. Our team responds fast, finds the source, and delivers a quick, reliable repair to keep the damage from spreading.
Stopping a leak at the source does more than dry a wet floor — it protects everything the basement touches. Here’s what you get back once it’s fixed right:
Basement leak repair cost depends on what’s causing the leak and how far the damage has spread. A single crack repair costs far less than a full waterproofing project. That’s why every job starts with a free inspection — we find the true source first, then quote the right fix.
| Repair Type | Approximate Cost (CAD) |
| Foundation Crack Repair (up to 4 ft wide / 5 ft deep) | From $1,800 |
| Foundation Crack Repair (up to 5 ft wide / 9 ft deep) | Up to $3,700 |
| Interior Basement Waterproofing (leak source) | $100 – $240 per linear foot |
| Exterior Waterproofing (leak source) | $150 – $400 per linear foot |
| Window Well Repair (Regular) | $1,900 – $3,500 |
| Sump Pump + Tank | $2,200 – $3,500 |
| Backwater Valve Installation | $2,200 – $3,500 |
| Weeping Tile Replacement | Free quote — priced per linear foot |
These are approximate ranges for typical residential projects. You get a detailed written quote after your free inspection, and the price you’re quoted is the price you pay — no surprise charges once work begins.
💰 City Rebate Alert: If your repair includes a sump pump or backwater valve, you may qualify for the Region of Peel Basement Flooding Subsidy. We explain your options and prepare the paperwork during your inspection. Rebate amounts and rules change, so we confirm what’s current before you commit.
Foundation cracks, wall seepage, floor leaks, window wells, and drainage failures each call for a different fix.
A small leak is quicker and cheaper to repair than widespread moisture or recurring flooding.
A crack repair costs less than interior waterproofing, exterior excavation, or a drainage upgrade.
Poured concrete, concrete block, and stone foundations each need different techniques.
Finished basements, landscaping, decks, or tight access around the foundation add labour and time.
A sump pump, backwater valve, or new weeping tile raises the total but pays off in long-term protection.
Mississauga sits on heavy Peel clay, with pockets of clay and shale near the Credit River and a high water table close to the Lake Ontario shoreline. Add our weather and a lot of aging homes, and basement leaks show up more here than in many parts of Ontario.
Knowing what’s behind the leak is the first step to the right repair. We identify the source, then recommend the most effective long-term fix.
A small leak turns into a costly repair when it’s ignored. Notice any of these? Book an inspection.
A burst of water in the basement doesn’t wait for business hours, and neither do we. Our 24/7 emergency team responds fast across Mississauga and the wider GTA when a leak turns into a flood — a failed sump pump during a storm, water pouring in after a spring downpour, or a sudden crack letting groundwater through.
Here’s what to do while we’re on the way. If it’s safe, shut off the power to the affected area, since floodwater can carry an electrical charge. Move valuables, documents, and electronics up out of the water. Then call us. The faster we find the source and stop it, the less damage to your foundation, your finishes, and your belongings. We arrive with fully stocked trucks, so most emergency repairs get handled on the first visit.
We check the basement walls, floor, window wells, exterior grading, and drainage. No cost, no obligation.
We use moisture detection tools, a drain camera when needed, and a close visual assessment to find exactly where the water is getting in. We never guess.
Once the source is confirmed, you get a clear, itemized estimate covering the repair, labour, materials, and timeline before any work starts.
Our licensed specialists complete the repair with proven methods and quality materials. Most repairs are done in a single visit; larger jobs get a confirmed schedule.
We inspect the repaired area, verify the work, and confirm the leak is resolved before we close the project.
You get written warranty paperwork at completion. Most basement leak repairs in the GTA carry our 25-year transferable warranty.
Fixing a leak properly protects far more than the wet spot in front of you.
A small basement leak rarely stays small. Repairing it early protects your home, cuts repair costs, and heads off serious water damage.
We’ve helped homeowners across Mississauga diagnose and fix leaks with solutions that address the source, not the symptom.
More than 20,000 homes waterproofed and repaired, over 10,000 foundation cracks sealed, and 800+ reviews on HomeStars at a 9.9/10 rating.
Most of our leak repairs carry it, so your protection follows the home if you sell.
Our team uses professional diagnostic tools, quality materials, and proven techniques to stop leaks and protect your foundation.
Business Hour:
Monday to Friday: 8a.m -9p.m
Saturday and Sunday: 9a.m – 2p.m
Most basement leaks come from foundation cracks, hydrostatic pressure, clogged weeping tile, poor drainage, window well leaks, or aging waterproofing.
It depends on the source and the repair needed. A small crack repair costs far less than full waterproofing or a drainage system fix. You get a written quote after a free inspection.
Yes. Some leaks only need crack repair, window well repair, or a drainage improvement. We recommend waterproofing only when it’s the best long-term solution.
We run a detailed inspection with moisture detection tools and a drain camera when needed to identify the exact source before recommending any repair.
It depends on your policy and the cause. We recommend checking with your insurer to confirm coverage — and keeping documentation of the repair, since undisclosed pre-existing leaks are often excluded.
Most repairs are done in a single day. Larger projects that need waterproofing or excavation may take longer, and we’ll give you a clear timeline first.
Yes. Even a small leak can lead to mould, water damage, and foundation problems if it’s left alone.
Fixing the leak removes the moisture mould needs. Any mould already present should be treated separately.
Yes. We provide fast 24/7 response for urgent leaks to limit water damage and protect your home.
Fast. We offer 24/7 emergency service and work across Mississauga daily, so we can usually get a technician to you quickly, even on short notice.
We do. We’re a licensed contractor, our qualifying installs meet the requirements, and we prepare the documentation so you’re not chasing paperwork.
Just call DrainCom to schedule your free on-site inspection. We’ll find the source, explain your repair options, and hand you a detailed written estimate.
Don’t let a small basement leak turn into costly water damage. Our team will find the true source and recommend the right repair for your home.
You’ll get honest advice, a detailed written estimate, and zero pressure to move forward.
905-238-6800