Basement waterproofing · Toronto & the west end
Since 2004, keeping water out of basements across Toronto, Etobicoke and Mississauga, with a written guarantee on all work and warranties from 15 years to lifetime.
4.8from 210 homeowner reviewsWaterproofing services
Exterior and interior waterproofing, foundation repair, drainage, underpinning, window wells and water mains. Not sure which you need? Start from where the water is.
Start from where the water is
We excavate to expose the foundation wall, clean it, seal every crack, cover it with a rubberised waterproof membrane, then add new weeping tile and dimple board and test the drainage. It is the only method that stops further structural breakdown of the wall.
Get a free estimate →Where the exterior wall is hard to reach: perimeter drainage inside the foundation, carried to a sump pump with a battery backup for power outages.
Sump & backup →03Floors and walls restored to a sturdy, structurally sound state, from crack injection to full wall rebuilds.
Structural →04Weeping tile, sump pumps and backwater valves: the drainage that carries water away from the foundation.
Weeping tile →05Sewer camera inspection, snaking, hydro jetting, root removal and trenchless drain repair.
Camera →06Lower the floor for extra height, with underpinning to keep the square footage, plus humidity ventilation and water damage prevention.
More headroom →07Repair of the water main into the house.
Water main →08Window well drains, so a below-grade window stops being the way water gets in.
Well drains →Why Keystone
Keystone is a family-run waterproofing and foundation company, started in 2004 and working on the houses of Toronto and the west end: postwar bungalows, century semis and everything in between.
Find the source, fix it properly, and put the guarantee in writing. That is the whole job.The Keystone crew
Homeowners
210 homeowner reviews
Homeowners across Toronto, Etobicoke and Mississauga, on what it was like once the work was done.
Get a free estimate“Found the source of a leak two other companies had missed, explained both options without any pressure, and finished on the day they said.”
“Clear quote, a tidy crew and no surprises on the invoice. The basement has stayed bone dry through two spring thaws.”
“They walked us through every step of the exterior work and left the garden in better shape than they found it.”
Sample testimonials for a fictional business.
Start here
Tap where you see the problem to see the symptoms, what usually causes it, and the fix.
On site
Excavation, waterproofing and drainage work across Toronto, Etobicoke and Mississauga.
How it works
Four steps from the first call to a written guarantee.
Tell us what you are seeing — water, a crack, a smell, a backed-up drain. (416) 555-0163, or the free estimate form below.
Someone comes to the house, finds the source and explains the options in plain language. If the source is not obvious, a full foundation inspection comes first.
Exterior or interior waterproofing, foundation repair, drainage or underpinning: scheduled, with the necessary permits for excavation and underpinning, and done on time and on budget, every time.
Every job comes with a written guarantee, and warranties run from 15 years to lifetime.
The people
Estimators, foremen and the crews who do the digging.
The person who looks at your basement writes the quote, checks in while the crew works and hands over the written warranty at the end.
Service area
Serving Toronto, Etobicoke and Mississauga: from the Junction and High Park out to Mimico, Islington, Long Branch and Port Credit.
Free estimate
Water, a crack, a smell, a drain that backs up. Describe it and Keystone calls to arrange a free, no-obligation look.
Waterproofing FAQs
Straight answers before the free estimate.
Ask us something elseYes, free and no obligation. Someone comes to the house and looks; nothing is quoted blind.
Exterior stops water before it reaches the wall and is the permanent fix; interior manages water from inside where excavation is impossible or unnecessary. The inspection tells you which applies.
Keystone offers 15-year to lifetime warranties, transferable if you sell the house, and a guarantee on all work performed, in writing.
Yes, fully insured and certified. It is worth asking any contractor who will dig beside your foundation.
That is efflorescence — minerals left behind as water evaporates through the concrete. It means water is moving through the wall even if the floor is dry. Worth an inspection.
Yes. Underpinning and basement lowering, along with foundation repair, drainage, window wells and water main repair.
Yes. We offer emergency waterproofing services 24/7. Call (416) 555-0163.
Free estimate
Or call (416) 555-0163