# Foundation Waterproofing Markham | Same-Day Crew

URL: https://foundationwaterproofingtoronto.ca/service-areas/markham/

![](/images/misc/two-crew-members-in-branded-shirts-carrying-weepin.webp)

location\_on Serving Markham and surrounding areas

# Foundation Waterproofing Markham: Basement Waterproofing, Crack Repair and Wet Basement Repair Across Unionville and Cornell

Last updated: October 26, 2026

Foundation Waterproofing Toronto provides foundation waterproofing, basement waterproofing, foundation crack repair, weeping tile, and sump pump installation across Markham in York Region, with 25+ years of GTA experience and every project built to Ontario Building Code Part 9. Our crews cover Unionville, Milliken, Cornell, Markham Village, Berczy Village, and the Markham side of Thornhill, where newer poured-concrete homes sit over high-water-table pockets in the Rouge watershed and settlement cracking is the usual trigger for crack injection and sump work.

payments Scope CAD cost anchor

Markham foundation crack injection runs $500 to $1,800 CAD per crack (2026 pricing), the standard settlement repair on newer poured-concrete stock. Sump pump installation is $1,500 to $3,500 CAD. Full interior weeping tile is $8,000 to $18,000 CAD, and a mainline backwater valve is $2,000 to $4,500 CAD.

-   bolt Same-day response in Markham
-   workspace\_premium 25+ years across the GTA
-   gavel City of Markham (York Region) permit administration
-   payments Published CAD pricing, free inspection

calendar\_month Book Free In-Home Inspection

[/contact/ →](/contact/)

 

call Call (647) 254-5110

[tel:+16472545110 →](tel:+16472545110)

UnionvilleMillikenCornellThornhillMarkham VillageBerczy Village L3P, L3R, L3S, L3TL6B, L6C, L6E, L6G

assignment

## Diagnostic Inspection Request

Free in-home inspection across Markham, with a written CAD diagnostic.

**Thanks, we have your request.** A Toronto dispatcher will call you to confirm the inspection slot.

-   workspace\_premium 25+ Years Experience
-   bolt Same-Day GTA Emergency Response
-   verified\_user Written Workmanship Warranty
-   gavel OBC Part 9 Compliant
-   savings Up to $3,400 CAD Subsidy Filed

Common problems

## Common Foundation and Basement Problems We Fix

Four patterns account for most of the calls we take across the GTA. Each one has a different cause, and each one has a different CAD number attached to fixing it.

water\_damage

### Water on the floor every spring

Melt water saturates clay soil, hydrostatic pressure builds at the footing, and the cove joint lets it through. It arrives on the same weekend every year.

healing

### Cracks and efflorescence you cannot read

A crack in a foundation wall could be harmless curing shrinkage or a structural warning. Nobody has measured it and told you which.

help

### 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.

price\_check

### 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.

What we do here

## Foundation Waterproofing Services in Markham

Markham's newer detached homes and freehold townhouses sit over high-water-table pockets with Rouge watershed drainage, and settlement cracking in poured concrete is the common trigger for foundation repair. Most calls here are solved with crack injection, interior waterproofing, and a correctly sized sump pump, while exterior waterproofing with excavation is reserved for older Unionville and Markham Village foundations where the original weeping tile has failed.

 

![Foundation Waterproofing Toronto crew applying exterior membrane to an excavated Toronto basement wall](/images/maps/two-crew-members-in-branded-shirts-and-safety-glas.webp) Most Requested Scope

water\_damage OBC 9.13 / 9.14

### 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

View details arrow\_forward

[Basement Waterproofing Toronto →](/basement-waterproofing-toronto/)

 

![Foundation Waterproofing Toronto crew injecting polyurethane into a vertical foundation crack in a Toronto basement](/images/maps/two-crew-members-in-branded-shirts-injecting-polyu.webp) Same-Visit Repair

healing 3000 PSI INJECTION

### 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

View details arrow\_forward

[Foundation Crack Repair Toronto →](/foundation-crack-repair-toronto/)

 

![Foundation Waterproofing Toronto crew laying perforated PVC weeping tile in a sub-slab trench in a Toronto basement](/images/maps/two-crew-members-in-branded-shirts-laying-perforat-2.webp) Written Workmanship Warranty

tune SUB-SLAB DRAINAGE

### 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

View details arrow\_forward

[Interior Weeping Tile Toronto →](/interior-weeping-tile-toronto/)

 

![Foundation Waterproofing Toronto crew fastening Delta-MS drainage board to an excavated Toronto foundation wall](/images/maps/two-crew-members-in-branded-shirts-fastening-dimpl.webp) Source Water Control

construction DELTA-MS SYSTEM

### 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

View details arrow\_forward

[Exterior Weeping Tile Toronto →](/exterior-weeping-tile-toronto/)

 

![Foundation Waterproofing Toronto crew lowering a cast-iron submersible sump pump into a sealed basin](/images/maps/two-crew-members-in-branded-shirts-lowering-a-subm.webp) CSA Certified

water\_pump 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

View details arrow\_forward

[Sump Pump Installation Toronto →](/sump-pump-installation-toronto/)

 

![Foundation Waterproofing Toronto crew setting a mainline fullport backwater valve in an opened basement floor trench](/images/maps/two-crew-members-in-branded-shirts-setting-a-mainl.webp) Up to $3,400 CAD Subsidy

gpp\_good MAINLINE FULLPORT

### 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

View details arrow\_forward

[Backwater Valve Installation Toronto →](/backwater-valve-installation-toronto/)

 

![Foundation Waterproofing Toronto crew applying positive-side membrane to a commercial foundation wall in Toronto](/images/maps/two-crew-members-in-branded-shirts-applying-positi.webp) Scoped Contract

apartment COMMERCIAL SCOPE

### 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

View details arrow\_forward

[Commercial Foundation Waterproofing Toronto →](/commercial-foundation-waterproofing-toronto/)

See every waterproofing scope

[/basement-waterproofing-toronto/ →](/basement-waterproofing-toronto/)

Our framework

## How Our Foundation Waterproofing Assessment Works, 5 Steps

The same five steps run on every job, from a single crack injection to a full perimeter system with City of Markham (York Region) permits.

1.  1 calendar\_month
    
    ### Booking
    
    Postal code, symptom, and photos. A same-day slot where one is open. The in-home inspection is free.
    
2.  2 search
    
    ### On-site inspection
    
    Foundation walls, floor slab, cove joint, weeping tile, downspouts and grading, moisture readings, and camera inspection.
    
3.  3 description
    
    ### Written diagnostic
    
    Fault identified, scope required, CAD cost, and an interior versus exterior recommendation with the numbers beside it.
    
4.  4 build
    
    ### Scheduled
    
    Crack injection often same-visit. Interior weeping tile within 5 to 10 business days. Exterior with excavation and City permits.
    
5.  5 verified
    
    ### 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 system

The free in-home inspection across Markham tells you which, in writing, with the CAD number beside it.

call (647) 254-5110

[tel:+16472545110 →](tel:+16472545110)

 

Book Free Inspection

[/contact/ →](/contact/)

Why us here

## 6 Reasons Markham Homeowners Call Our Crew

-   check\_circle 25+ Years of Foundation Waterproofing Experience across York Region, from heritage Unionville to new Cornell subdivisions
-   check\_circle Same-day dispatch off the 404, 407, and Highway 7
-   check\_circle Crack triage that separates normal curing shrinkage from genuine structural movement
-   check\_circle Sump sizing and battery backup for Cornell and Unionville high-water-table pockets
-   check\_circle Clear that the Toronto subsidy does not apply here, with current York Region programmes checked
-   check\_circle Published CAD pricing on every scope before the crew is booked

Local logistics

## Off the 404 and 407: Same-Day Dispatch From Milliken to Cornell

Markham is reached off the 404, 407, Highway 7, and Markham Road, with same-day dispatch across the city, from Milliken and Pacific Mall on the Toronto border at Steeles Avenue up to Angus Glen and Cathedraltown. If you are searching for foundation waterproofing near you in Markham, the nearest crew is usually already working between Markville Shopping Centre and Main Street Unionville. Subdivision access is straightforward, so where exterior waterproofing is the right answer, machine access is rarely what decides against it.

Markham is in York Region, so permits go through the City of Markham and the Toronto Basement Flooding Protection Subsidy does not apply. Foundation Waterproofing Toronto says that plainly at quoting rather than letting a homeowner budget around a figure that belongs to a different municipality, and checks current York Region and City of Markham programmes at the time.

Many Markham detached homes now carry a finished basement or a second suite, which raises the stakes on a leak because water reaches flooring and drywall rather than bare concrete.

Rouge watershed drainage governs the storm response. Streets close to the Rouge River and its tributaries, from Box Grove to the edge of Rouge National Urban Park, take surface water faster during heavy rain, and those are triaged first.

## Settlement Cracks and High Water Tables: Foundation Repair for Newer Poured Concrete

Markham's foundation work divides into two clear patterns.

**Settlement and shrinkage cracking** in poured concrete built from the 1990s onward in Berczy Village, Wismer Commons, Greensborough, and Cornell. Concrete shrinks as it cures, engineered fill consolidates, and vertical cracks appear near openings and form tie lines. These leak, they are usually non-structural and rarely a case for underpinning, and 

polyurethane injection

[/foundation-crack-repair-toronto/ →](/foundation-crack-repair-toronto/)

 at $500 to $1,200 CAD per crack is the whole job.

**High-water-table pockets**, particularly in Cornell and parts of Unionville, where development altered the drainage of a parcel and groundwater now sits closer to the slab than the original design assumed. The symptom is a sump that runs frequently even in dry weather, and the answer is 

pump quality, correct sizing, and battery backup

[/sump-pump-installation-toronto/ →](/sump-pump-installation-toronto/)

 rather than a membrane system. Where the builder's weeping tile has silted up, interior waterproofing with new weeping tile draining to the sump is the next step.

**Older Unionville, Markham Village, and Markham Thornhill** properties include genuine heritage housing with stone and older block foundations, and those are surveyed on their own terms rather than by subdivision assumptions. Older sewer laterals on these streets also make a 

mainline backwater valve

[/backwater-valve-installation-toronto/ →](/backwater-valve-installation-toronto/)

 worth checking alongside the sump.

Rouge watershed proximity affects surface water. Where a lot sits low relative to a tributary or a storm outlet, 

grading and a French drain

[/french-drain-installation-toronto/ →](/french-drain-installation-toronto/)

 often matter more than anything done to the foundation wall itself, and the 

foundation waterproofing Toronto

[/ →](/)

 diagnostic says so in writing when that is the finding.

![Two crew members inspecting a damp foundation wall together with a moisture meter in a Greater Toronto Area basement](/images/content/two-crew-members-inspecting-a-damp-foundation-wall.webp)

### Markham at a glance

Neighbourhoods covered

Unionville, Milliken, Cornell, Thornhill, Markham Village, Berczy Village

Postal zones

L3P, L3R, L3S, L3T, L6B, L6C, L6E, L6G

Response time

Same-day

Permits through

City of Markham (York Region)

Book Free In-Home Inspection

[/contact/ →](/contact/)

directions Get Directions to Markham

[https://www.google.com/maps/dir/?api=1&destination=43.8561,-79.337 →](https://www.google.com/maps/dir/?api=1&destination=43.8561,-79.337)

Customer Feedback

## What Markham Customers Say

Verified project feedback from Toronto and GTA homeowners. Names are shortened for privacy.

format\_quote

> Our sump ran every few minutes even in August. They confirmed the water table is high in our pocket of Cornell, replaced the pump with a cast-iron unit, and added battery backup. Sleeping better during storms.

Lian C.Cornell

format\_quote

> Two cracks in a twelve year old poured wall. Measured, documented as shrinkage, injected in one visit for $1,400 CAD. No pressure to buy anything else.

Bradley O.Unionville

format\_quote

> Surface water from a neighbouring lot was pooling against our foundation. They regraded and put in a short French drain instead of quoting a basement system. Straightforward and it worked.

Renata S.Milliken

Answers

## Foundation Waterproofing in Markham: Questions We Get

How much does foundation waterproofing cost in Markham? expand\_more

Crack injection is $500 to $1,800 CAD per crack, sump pump installation is $1,500 to $3,500 CAD, and interior weeping tile is $110 to $220 CAD per linear foot (2026 pricing). Price is driven by linear footage, slab cutting, excavation depth, and permits, which is why exterior work costs several times more than interior work. Because Markham housing is newer, most jobs here are targeted repairs, and the in-home inspection is free.

Why does my Markham sump pump run so often? expand\_more

Several pockets in Cornell and Unionville sit over high water tables where development changed the natural drainage. A sump that cycles frequently is doing its job, but it makes pump quality and battery backup worth the extra spend.

Does the Toronto subsidy apply in Markham? expand\_more

No. Markham is in York Region and the Basement Flooding Protection Subsidy is a City of Toronto programme. We check what York Region and the City of Markham currently offer when we prepare your quote.

Are cracks in a new Markham home normal? expand\_more

Vertical shrinkage cracks near openings in the first couple of years are common as concrete cures and fill consolidates. They are usually non-structural. They do leak, which is why injection is worth doing, but they are not a sign the house is failing.

Does Rouge watershed drainage affect my property? expand\_more

If your lot sits low relative to a tributary or a storm outlet, surface water reaches your foundation faster during heavy rain. On those properties, yard grading and drainage often matter more than anything done to the wall.

Do Markham homes need interior or exterior waterproofing? expand\_more

Most newer Markham homes need neither full system, because crack injection plus a correctly sized sump pump stops the leak. Where the weeping tile has failed, interior waterproofing runs $8,000 to $18,000 CAD and carries a 25-year transferable warranty. Exterior waterproofing uses a membrane such as Blueskin or Aqua Bloc with Delta-MS drainage board rather than a sealant alone, and runs $15,000 to $35,000 CAD for the full perimeter.

How much does it cost to waterproof a 1,000 sq ft basement in Markham? expand\_more

For a typical 1,000 sq ft basement, full-perimeter interior weeping tile falls in the $8,000 to $18,000 CAD band, with the final figure set by linear footage, finished walls, and slab access. Full-perimeter exterior waterproofing with excavation runs $15,000 to $35,000 CAD. Many newer Markham basements need only a fraction of either, such as one or two injected cracks at $500 to $1,800 CAD each.

### 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

[/contact/ →](/contact/)

## Foundation Waterproofing Near Markham

Our crews cover neighbouring areas on the same dispatch schedule, so a job next door does not wait for a separate truck.

ScarboroughSame-day response arrow\_forward

[/service-areas/scarborough/ →](/service-areas/scarborough/)

 

Richmond HillSame-day response arrow\_forward

[/service-areas/richmond-hill/ →](/service-areas/richmond-hill/)

![](/images/misc/two-crew-members-reviewing-a-written-cad-diagnosti.webp)

Same-Day GTA Emergency Response

## Book a free foundation inspection in Markham

A crew attends on a same-day schedule, identifies the water source, and puts the scope and the CAD price in writing before any work is booked.

calendar\_month Book Free In-Home Inspection

[/contact/ →](/contact/)

 

call Call (647) 254-5110

[tel:+16472545110 →](tel:+16472545110)

-   check\_circle Free in-home inspection with a written diagnostic
-   check\_circle Published CAD pricing before any work starts
-   check\_circle OBC Part 9 compliant, WSIB registered, $2M insured