Foundation Waterproofing in Toronto: Crack, Leak and Wet Basement Repair
25+ years fixing wet basements across Toronto and the GTA with crack injection, weeping tile, and sump systems, published CAD pricing, and a free in-home inspection.
Foundation Waterproofing Toronto provides foundation waterproofing, basement waterproofing, foundation crack repair, and wet basement solutions throughout Toronto, ON, backed by 25+ years of experience. Our crew installs interior weeping tile, exterior foundation membrane, polyurethane and epoxy crack injection, cove joint sealing, Delta-MS drainage board, and sump pump plus backwater valve systems under Ontario Building Code Part 9 for older Toronto homes with hydrostatic pressure, foundation cracks, or basement flooding history.
- 25+ Years Foundation Waterproofing Experience
- Ontario Building Code Part 9 Compliant
- Written Workmanship Warranty Available
- Toronto Basement Flooding Subsidy Coordinated
- Free In-Home Basement Inspection
- Same-Day GTA Emergency Response
- 25+ Years Experience
- Same-Day GTA Emergency Response
- Written Workmanship Warranty
- OBC Part 9 Compliant
- Up to $3,400 CAD Subsidy Filed
4 Ways Basement Water Shows Up, and What Causes Each
Four patterns account for most of the calls we take across the GTA, from century semi-detached homes in Leslieville, Riverdale, and The Annex to post-war bungalows in East York and on Humber River and Don Valley ravine lots. Each one has a different cause, and each one has a different CAD number attached to fixing it.
Water on the floor every spring
Melt water saturates clay soil, hydrostatic pressure builds at the footing, and the cove joint or a clogged window well lets it through. It arrives on the same weekend every year.
Foundation cracks and efflorescence you cannot read
A crack in a foundation wall could be harmless curing shrinkage or a structural warning, and a hydraulic cement patch from a previous owner usually hides it rather than seals it. Nobody has measured it and told you which.
Interior or exterior, and nobody will say
Two contractors, two answers, a $20,000 CAD gap between them, and no written reasoning attached to either recommendation.
The feeling of being over-quoted
Some quotes are $18,000 CAD for work that needs $2,500. Without a diagnostic naming the water source, there is no way to check.
13 Specialised Waterproofing Scopes, From Crack Injection to Weeping Tile
Built to withstand Toronto clay soil hydrostatic expansion and severe freeze-thaw cycling, from interior weeping tile and crack injection to exterior waterproofing with full excavation. We install Blueskin and Aqua Bloc membranes, Delta-MS and Platon drainage board, Emecole injection resins, and Zoeller and Liberty Pumps sump pumps. Every scope below is priced in CAD on its own page, with the free in-home inspection confirming which one your basement actually needs.
Most Requested Scope Basement Waterproofing Toronto
Interior and exterior basement waterproofing in Toronto and the GTA for homes with hydrostatic pressure, efflorescence, or spring-thaw seepage, with a free inspection and published CAD pricing.
Interior $8,000 to $18,000 CAD, exterior $4,500 to $35,000 CAD
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Same-Visit Repair Foundation Crack Repair Toronto
Foundation crack repair in Toronto and the GTA: polyurethane and structural epoxy injection for poured concrete foundation cracks, structural versus non-structural triage, published per-crack CAD pricing, and a 10-year written workmanship warranty.
From $500 CAD per crack
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Written Workmanship Warranty Interior Weeping Tile Toronto
Interior weeping tile in Toronto and the GTA: a sub-slab perimeter drain and air-gap membrane tied to a sump pump, $110 to $220 CAD per linear foot, installed in 3 to 5 days with a written workmanship warranty.
$110 to $220 CAD per linear foot
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Source Water Control Exterior Weeping Tile Toronto
Exterior weeping tile replacement: footing-level excavation, Delta-MS drainage board, and membrane to control water at the source.
$4,500 to $35,000 CAD by excavation scope
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CSA Certified Sump Pump Installation Toronto
CSA-certified submersible sump pump installation in Toronto and the GTA with a sealed basin, silent check valve, high-water alarm, and optional battery backup.
$1,500 to $3,500 CAD installed
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Up to $3,400 CAD Subsidy Backwater Valve Installation Toronto
Mainline backwater valve installation in Toronto and the GTA to prevent sewer backup and basement flooding, with plumbing permit, Toronto Water pre-inspection, and up to $3,400 CAD subsidy filing.
$2,000 to $4,500 CAD, up to $3,400 CAD subsidy available
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Same-Day GTA Dispatch Emergency Basement Flooding Toronto
Emergency basement flooding response in Toronto and the GTA: same-day dispatch, water extraction, sewer backup vs hydrostatic pressure diagnosis, moisture readings, and a permanent backwater valve, sump pump, or weeping tile fix under Ontario Building Code Part 9.
Diagnostic from $299 CAD, permanent fixes scoped by cause
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Engineering Coordinated Concrete Foundation Repair Toronto
Concrete foundation repair in Toronto and the GTA: structural crack repair, carbon fibre or steel bowing wall stabilization, rubble stone repointing, and foundation rebuilds, with structural engineer coordination and City of Toronto Building Division permits under Ontario Building Code Part 9.
From $700 CAD per crack, rebuild $30,000 to $80,000 CAD
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Fast Targeted Fix Window Well Drainage Toronto
Window well drainage across Toronto and the GTA: vertical gravity drain tied to the foundation weeping tile, clear drainage gravel, window well installation and polycarbonate safety covers, plus grading and downspout diversion around the well to stop basement window leaks.
$850 to $2,500 CAD per window well
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Surface Water Control French Drain Installation Toronto
French drain installation: perforated pipe in a clear gravel trench, downspout integration, grading correction, and discharge to lot line under Ontario Building Code Part 9, relieving hydrostatic pressure at the foundation before it reaches the basement.
$85 to $175 CAD per linear foot
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Scoped Contract Commercial Foundation Waterproofing Toronto
Commercial foundation waterproofing in Toronto and the GTA for buildings under 15,000 sq ft: parkade slabs, elevator pits, blindside and positive-side membrane, $2M commercial general liability, and WSIB coverage on a scoped per-project contract.
$25,000 to $150,000 CAD per project
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Source-First Diagnosis Basement Leak Repair Toronto
Basement leak triage: wall crack, cove joint, window well, or floor slab source diagnosed via moisture meter reading and camera inspection, matched to targeted polyurethane injection, sealing, or drainage fix.
$500 to $6,500 CAD, scoped by leak source
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Cause-Based Scoping Wet Basement Repair Toronto
Wet basement diagnosis: efflorescence, chronic dampness, vapour control, crawl space encapsulation, or a full interior and exterior weeping tile system, routed to the correct scope by written moisture reading and camera inspection.
$500 to $18,000 CAD, scoped by cause
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Six Reasons GTA Homeowners Call Us First
Foundation Waterproofing Toronto is WSIB registered, carries $2M liability insurance, and installs CSA-certified sump pumps and backwater valves to the Ontario Plumbing Code. Every claim here is checkable against this page or provable on request, which is the standard we hold ourselves to on quotes as well.
25+ Years of Foundation Waterproofing Experience
Two and a half decades of interior weeping tile, exterior membrane, polyurethane and epoxy crack injection, and sump and backwater valve installation across Toronto and the GTA. That range is why our diagnosis is quick and our recommendation is narrow.
Same-Day GTA Emergency Response
Toronto, Vaughan, Mississauga, Brampton, Markham, Richmond Hill, North York, Scarborough, Etobicoke, and Oakville. Spring thaw and storm flooding is prioritised within 24 hours and triaged by water depth.
Transparent CAD Pricing Published
Free in-home inspection, crack injection from $500 CAD, sump pump $1,500 to $3,500 CAD, backwater valve $2,000 to $4,500 CAD, interior weeping tile $110 to $220 CAD per linear foot. Every number is on the page before you call.
Ontario Building Code Part 9 Compliant
Every project meets OBC 9.13 dampproofing and 9.14 waterproofing requirements, with City of Toronto Building Division permit administration on major projects and plumbing permits filed for us to close out.
Toronto Subsidy Coordination
Registered Basement Flooding Protection Subsidy contractor. We file the paperwork so eligible homeowners recover up to $3,400 CAD toward sump pump, backwater valve, and pipe severance work.
Written Workmanship Warranty
Every project ships with a written workmanship warranty and a written CAD scope, backed by 25+ years of GTA foundation waterproofing experience under Ontario Building Code Part 9.
What Actually Stops Toronto Homeowners From Fixing a Wet Basement
The estimate feels like a fishing expedition.
Some contractors quote $18,000 CAD for a job that needs $2,500. Our free in-home inspection identifies the actual cause and quotes only the scope needed, with the written diagnostic included so you can hold every other quote against it.
I do not know if exterior or interior waterproofing is right.
Exterior addresses water at the source but requires excavation, at $15,000 to $35,000 CAD. Interior weeping tile manages water at the wall, at $8,000 to $18,000 CAD. We recommend based on foundation type, water source, and grading, in writing, with both numbers shown.
Every waterproofer promises a warranty that is meaningless if they close.
Every project is documented in writing with a workmanship warranty and a written CAD scope, backed by 25+ years of continuous GTA foundation waterproofing experience under Ontario Building Code Part 9. The paperwork is what a buyer inspector will ask for later.
The $3,400 subsidy sounds too good to be true.
The Toronto Basement Flooding Protection Subsidy is real: up to $3,400 CAD across a sump pump, a backwater valve, and pipe severance. We are a registered contractor and we file the paperwork with the permit and inspection records attached.
How Our Toronto Foundation Waterproofing Assessment Works, 5 Steps
The same five steps run on every job, from a single crack injection in a High Park rowhouse to a full perimeter system with City permits under a Willowdale detached home.
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Booking
Postal code, symptom, and photos. A same-day slot where one is open. The in-home inspection is free.
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On-site inspection
Foundation walls, floor slab, cove joint, weeping tile, downspouts and grading, moisture readings, and camera inspection.
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Written diagnostic
Fault identified, scope required, CAD cost, and an interior versus exterior recommendation with the numbers beside it.
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Scheduled
Crack injection often same-visit. Interior weeping tile within 5 to 10 business days. Exterior with excavation and City permits.
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Verification
Water test, moisture re-check, permit close-out, and the written workmanship warranty issued in writing.
Not Sure Whether You Need a Repair or a Full System?
The free in-home inspection tells you which, in writing, with the CAD number beside it.
How Much Foundation Waterproofing Costs in Toronto (2026 CAD Bands)
Foundation waterproofing is not a packaged-tier product. It is scope-of-work priced by problem severity and system size. These are the four bands we quote from, published as 2026 CAD ranges so you can compare before you call.
Diagnostic Band
$0 to $499 CAD
Find and quote the problem before anything is sold.
- Free in-home basement inspection: $0
- Foundation assessment with written report: $199 to $349 CAD
- Moisture diagnostic with camera inspection: $299 to $499 CAD
Standard Repair Band
$500 to $4,500 CAD
Targeted crack, joint, and component fixes.
- Polyurethane crack injection: $500 to $1,200 CAD per crack
- Cove joint repair: $95 to $185 CAD per linear foot
- Sump pump installation: $1,500 to $3,500 CAD
- Backwater valve: $2,000 to $4,500 CAD
Major Repair Band
$4,500 to $18,000 CAD
Full-side or partial-perimeter systems.
- Interior weeping tile: $110 to $220 CAD per linear foot
- Interior full perimeter: $8,000 to $18,000 CAD
- Exterior partial wall: $4,500 to $12,000 CAD
- French drain: $85 to $175 CAD per linear foot
Full System Band
$15,000 to $150,000 CAD
Complete foundation waterproofing and structural work.
- Exterior full perimeter: $15,000 to $35,000 CAD
- Interior and exterior combined: $20,000 to $45,000 CAD
- Foundation rebuild with waterproofing: $30,000 to $80,000 CAD
- Commercial projects: $25,000 to $150,000 CAD
Every quote itemises the diagnostic fee, materials, labour, permit, and disposal separately. The in-home inspection is free, and the Toronto Basement Flooding Protection Subsidy of up to $3,400 CAD is filed on your behalf for eligible sump pump and backwater valve work.
What Homeowners Say After the Water Stops
Verified project feedback from Toronto and GTA homeowners. Names are shortened for privacy.
Our basement in Leslieville took water through two foundation cracks every spring. The crew injected both with polyurethane and had us dry in one visit for about $1,600 CAD. The written diagnostic explained exactly what we were paying for.
We had interior weeping tile installed around the full perimeter of our North York bungalow. Three days of work, tied into a new sump pump, and the written workmanship warranty gave us confidence to finish the basement afterward.
They filed the Toronto Basement Flooding Protection Subsidy paperwork for our backwater valve and sump pump in Scarborough. We recovered a meaningful part of the cost and the plumbing permit was handled start to finish.
Weeping Tile, Backwater Valves and Crack Injection, Mid-Job
Documentary photos from basements and foundation trenches across the GTA. Select any image to enlarge it.
Serving Toronto and 9 More GTA Service Areas
Same-day dispatch across Toronto, York, and Peel, and next-day into Halton. Each area page covers the local foundation stock, from poured concrete and concrete block to the rubble stone walls under older Roncesvalles and Danforth homes, plus soil conditions and what that means for the scope you need.
- Monday to Friday: 8:00 am to 6:00 pm
- Saturday: 9:00 am to 4:00 pm
- Sunday: Emergency calls only
Foundation Waterproofing Questions Toronto Homeowners Ask
How much does foundation waterproofing cost in Toronto?
What is the difference between interior and exterior waterproofing?
Is the Toronto Basement Flooding Protection Subsidy real?
How do I know if my foundation crack is structural or non-structural?
How long does interior weeping tile installation take?
What warranty is included?
Do you need a permit for foundation waterproofing in Toronto?
When should I get a wet basement inspection?
What causes basement flooding in Toronto?
Do you repair foundation cracks from the outside or inside?
What areas do you serve around Toronto?
How do I know if my sump pump is working?
What is the best way to waterproof a foundation?
Is there a basement waterproofing contractor near me in the GTA?
Still have a question about your basement
Book a free in-home inspection and we will answer it in writing, with the scope and the CAD price on the same page.
Book Free In-Home Inspection
Book the free in-home inspection and get the water source in writing
A written diagnostic names the fault, the scope, and the CAD price before any work is scheduled, and the Toronto subsidy is filed on your behalf where the scope qualifies.
- Free in-home inspection with a written diagnostic
- Published CAD pricing before any work starts
- OBC Part 9 compliant, WSIB registered, $2M insured