Basement Waterproofing for Homes in York, Toronto
Leaquida provides basement waterproofing in York, Toronto — the former City of York between the Humber River and Bathurst Street: Weston, Mount Dennis, Rockcliffe–Smythe, Keelesdale, Silverthorn, Fairbank, Oakwood Village, Humewood–Cedarvale, Lambton and Baby Point. Our office is just across the Humber in Etobicoke.
Our waterproofing services in York cover the whole job: a free inspection to find where the water comes from, exterior or interior waterproofing, new weeping tile, sump pumps, backwater valves, window wells and foundation crack repair — one written quote, one crew, one written warranty.
Many York homes are 1910s–1950s semis and detached houses on narrow lots, often with low basements. If you are also thinking about lowering or underpinning the basement, it makes sense to plan the waterproofing at the same time, so the walls and floor are done once.
York Basement Waterproofing at a Glance
| Question | Short answer |
|---|---|
| What does it cost? | Interior $50–$120 per linear foot, exterior $100–$250 per linear foot; most full projects $3,000–$35,000. Inspection and quote are free. |
| Is there a rebate? | Yes — York is part of Toronto, so the City’s Basement Flooding Protection Subsidy pays up to 80% of the invoice, up to $6,650 per property. |
| Do I need a permit? | A City of Toronto building permit is needed for a backwater valve, and it must be inspected before it is covered up. |
| How long does it take? | Crack repair and sump pumps usually take one visit; interior systems 2–5 days; exterior waterproofing 3–7 days. |
| Which method is right? | Exterior when water comes through the walls and the outside is reachable; interior for floor–wall joint leaks, high groundwater and tight side yards. |
Why York Basements Take on Water
York sits on the east bank of the Humber River, with Black Creek running down to it through the north-west. In between are clay soils, steep streets and some of the oldest housing in the west end.
Humber and Black Creek
Homes near the Humber valley in Weston, Lambton and Mount Dennis, and near Black Creek, often see high groundwater after heavy rain and in spring.
Clay soil
Much of York sits on clay that drains slowly and holds water against foundation walls, building pressure on old block and brick foundations.
Steep streets
Silverthorn and Fairbank are known for steep hills. Water running downhill collects against houses on the low side, at reverse-slope driveways and in window wells.
Old weeping tile
1910s–1950s homes often have clay weeping tile that has cracked, shifted or filled with roots — or no working weeping tile at all.
Narrow lots and shared walls
Semis and row houses with tight side yards make exterior digging hard, so interior drainage is often the practical choice.
Sewer backup
Older combined sewers can surcharge in cloudbursts like July 16, 2024, when Toronto got more than a month’s rain in about three hours.
Real Leaquida job siteYork Has a Long History With the Humber
- October 1954: Hurricane Hazel flooded the Humber in Weston. On Raymore Drive 35 residents died, and the destroyed part of the street is now Raymore Park.
- Study Area 45 (Black Creek): the City studied recurring basement and surface flooding between St. Clair Ave W and Steeles, from Highway 400 to Keele St, and recommended 234 new and larger storm and sanitary sewers.
- July 16, 2024: more than a month’s rain fell in hours across Toronto, causing widespread basement flooding.
- Sewer upgrades take years. A backwater valve, a sealed sump pump and working weeping tile protect your basement in the meantime.
We check whether your floor drain, sewer lateral and weeping tile are part of the problem before we recommend waterproofing the walls.
Sources: Raymore Drive and the City of Toronto, Basement Flooding Study Area 45 (Black Creek).
What Your Basement Is Telling You
Match what you see to the likely cause. We confirm it on site before recommending anything.
| What you see | Likely cause | Usual fix | Typical price |
|---|---|---|---|
| Water along the bottom of a wall after rain | Floor–wall joint leak, clogged weeping tile | Interior drainage + sump pump, or new exterior weeping tile | $50–$250 / lin. ft |
| A wet line coming down from a crack | Leaking foundation crack | Polyurethane or epoxy injection from inside | $500–$1,500 / crack |
| Water or sewage from the floor drain | Sewer backup during a storm | Backwater valve with alarm | $2,000–$4,200 |
| Water under a basement window | Window well with no drain or a blocked drain | Window well drain, gravel and liner | From $200 |
| Damp walls, white powder, musty smell | Slow seepage through the wall | Exterior membrane, or interior system for tight lots | $50–$250 / lin. ft |
| Sump pump running non-stop or failing | Undersized or worn pump, high groundwater | New pump, sealed lid, check valve, battery backup | $500–$3,900 |
Basement Waterproofing Across York Neighbourhoods
York went from the Township of York to a borough (with Weston, from 1967) and then a city (1983), so the housing ranges from century-old main-street homes to post-war bungalows.
| Area | Typical homes | What we often check first |
|---|---|---|
| Weston, Humber Heights | Victorian and early-1900s homes, post-war houses near the Humber | Stone or brick foundations, high groundwater — parging, exterior membrane, sump pump |
| Mount Dennis, Rockcliffe–Smythe, Lambton | 1920s–1950s houses close to the river valleys | Wall seepage, floor–wall joint leaks — interior drainage, sump pump |
| Silverthorn, Keelesdale, Fairbank | 1910s–1940s semis and detached homes on steep streets | Water from uphill, window wells, old clay weeping tile |
| Oakwood Village, Caledonia | Early-1900s brick semis and row houses | Narrow lots, shared walls — interior waterproofing, crack repair, backwater valve |
| Humewood–Cedarvale, Baby Point | 1910s–1930s larger brick homes | Porous older foundations, underpinned basements — exterior membrane, crack injection |
| Briar Hill–Belgravia, Beechborough | 1920s–1950s bungalows and semis | Sewer backup, floor drains, failed weeping tile |
General guidance based on typical housing in each area — every home is different, so we confirm the cause on site.
Our Basement Waterproofing Services in York
From $100 / lin. ftExterior Basement Waterproofing
Excavation to the footing, membrane, drainage board and new weeping tile — water never reaches the wall.
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From $50 / lin. ftInterior Basement Waterproofing
Drainage under the floor along the walls and a sealed sump pump — no digging in your yard.
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$500 – $1,500 / crackFoundation Crack Repair
Injection that seals leaking foundation cracks from the inside, usually in one visit.
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From $500 / unitSump Pump Installation
Sealed basin, reliable pump, discharge line and optional battery backup.
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From $50 / lin. ftWeeping Tile & French Drains
New perforated weeping tile in clear stone to replace clogged or broken tile.
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From $200Window Well Installation
Window wells with a proper drain so basement windows stop leaking.
Learn more →
How Much Does Basement Waterproofing Cost in York?
Typical 2026 price ranges for York homes, before any rebate. Your exact price is written in your quote after a free inspection.
| Service | Price range | Typical duration* |
|---|---|---|
| Interior waterproofing | $50 – $120 per linear foot | 2 – 5 days |
| Exterior waterproofing | $100 – $250 per linear foot | 3 – 7 days |
| Full basement project | $3,000 – $35,000 | Depends on scope |
| Foundation crack repair | $500 – $1,500 per crack | Usually one visit |
| Sump pump installation | $500 – $3,900 per unit | Usually 1 day |
| Backwater valve | $2,000 – $4,200 per unit | Usually 1 day + permit |
| Inspection & written quote | Free | One visit |
*Typical for an average home; your schedule is confirmed in the quote. Costs rise with finished basements, deep foundations, decks, driveways and mature trees next to the wall.
Example: one 40-ft wall
- Interior drainage: about $2,000 – $4,800
- Exterior waterproofing: about $4,000 – $10,000
- Plus a sump pump if there is no pit yet
Simple arithmetic from the ranges above — not a quote.
What changes the price in York
- Narrow side yards or shared walls on semis
- Low basements being lowered or underpinned at the same time
- Old clay weeping tile that needs full replacement
- Stone or block foundations that need parging
Toronto Basement Flooding Subsidy for York Homes
York is part of the City of Toronto, so homeowners can apply to the Basement Flooding Protection Subsidy Program — up to 80% of the invoice, within these limits.
| Eligible work | Maximum subsidy |
|---|---|
| Home plumbing assessment | Up to $500 |
| Backwater valve (incl. alarm) | Up to $1,600 each, max. 2 ($3,200) |
| Sump pump (incl. alarm) | Up to $2,250 |
| Sump pump battery backup | Up to $300 |
| Weeping tile severance & capping | Up to $400 |
| Total per property | Up to $6,650 |
Rules worth knowing
- Amounts apply to work completed on or after November 12, 2025; apply within two years of installation.
- Single-family, duplex, triplex and fourplex homes; the registered owner applies.
- A backwater valve needs a building permit and an inspection before it is covered up.
- Downspouts must be disconnected from the City sewer (or you need an exemption).
- The contractor must hold a valid City of Toronto business licence at the time of the work.
What we prepare for your application
- Itemized, paid-in-full invoice with each device listed separately
- Battery backup itemized on its own line, as the City requires
- Building permit and inspection for the backwater valve
- Photos of the sump pump and its outside discharge pipe
- Clear advice on which devices your home actually needs
Program rules are set by the City of Toronto and can change; funding is subject to annual Council approval. Check the current details at toronto.ca.
Permits and Inspections in York
Backwater valve
Needs a City of Toronto building permit. The valve must be inspected before it is enclosed — required for both the Building Code and the subsidy.
Sump pump and weeping tile
For the subsidy the City asks for photos of the pump and its exterior discharge pipe; any change to the drain connection is plumbing work under the Building Code.
Digging next to the house
Before any exterior excavation we request free utility locates through Ontario One Call, so gas, hydro and cable lines are marked.
Crack repair and interior work
Crack injection, interior drainage and sump pump replacement usually do not need a permit, unless the plumbing connection changes.
Our Process for York Homes
Free inspection
We check inside and outside, the sump pit, floor drains, grading and downspouts, and find the real cause.
Written quote
Scope, price, schedule and warranty in writing — plus which rebates you can claim.
Rebate & permits
Where a permit is needed — for example for a backwater valve — we arrange it and book the inspection.
The work
Our own crew protects your property and completes the job.
Test & paperwork
We test the system, clean up and give you the itemized invoice for any claim.
What Goes Into a Leaquida Waterproofing Job
Exterior and drainage
- Excavation to the footing and a cleaned, repaired wall
- Waterproof membrane plus a dimpled drainage board
- New 4-inch perforated weeping tile in clear stone
- Backfill, grading away from the house and site clean-up
Inside the basement
- Sealed sump basin, check valve and high-water alarm
- Battery backup pump on request
- Backwater valve with an access cover for cleaning
- Crack injection with polyurethane or structural epoxy
Real Leaquida job siteLocal Facts That Matter for Your Basement
- York was its own city until it joined Toronto in 1998, so City of Toronto permits and subsidies apply.
- The Town of Weston joined the Borough of York in 1967; Weston Road is still its main street.
- Silverthorn and Fairbank are sometimes called Toronto’s “hidden San Francisco” for their steep streets.
- Postal codes we serve include M6C, M6E, M6M, M6N, M6S and M9N.
Buying an older home in York? Ask about past floods, whether the basement was ever lowered or underpinned, the sump pump’s age and whether there is a backwater valve — and book an inspection before you close.
Real Leaquida Waterproofing Work
Photos from our own projects across Toronto and the GTA.
York Neighbourhoods We Serve
Also serving nearby
Basement Waterproofing in York: Questions & Answers
How much does basement waterproofing cost in York?
Interior waterproofing usually costs $50–$120 per linear foot and exterior waterproofing $100–$250 per linear foot. Most full projects in York fall between $3,000 and $35,000. The inspection and written quote are free.
Can York homeowners get the Toronto basement flooding subsidy?
Yes. York is part of the City of Toronto, so homeowners can apply for up to $6,650 per property for eligible work such as backwater valves, sump pumps, battery backup and weeping tile severance, at up to 80% of the invoice.
Do I need a permit for a backwater valve in York?
Yes. A City of Toronto building permit is required, and the valve must be inspected before it is covered up. We arrange the permit as part of the job.
My York semi has almost no side yard. Can you still waterproof it?
Yes. Where there is no room to dig, or the wall is shared, we usually install interior drainage along the inside of the wall, connected to a sealed sump pump. Cracks are injected from inside.
We want to lower our basement. Should we waterproof at the same time?
Usually yes. Underpinning or lowering already opens the floor and footings, so new weeping tile, a sump pump and a backwater valve cost less to add then than later. We plan both parts together.
Is interior or exterior waterproofing better for my York home?
Exterior waterproofing stops water before it reaches the wall and suits leaks through the walls where the outside is accessible. Interior drainage handles floor–wall joint leaks and high groundwater and avoids digging up landscaping. We recommend the right method after the inspection.
Can you waterproof a basement in winter?
Interior waterproofing, crack injection and sump pumps can be done year-round. Exterior excavation depends on ground conditions and frost, and we schedule it accordingly.
How long does a waterproofing job take in York?
Crack injection and sump pump installs usually take one visit, interior drainage 2–5 days and exterior waterproofing 3–7 days for an average home. Your schedule is written into the quote.
Does home insurance cover basement flooding?
It depends on your policy. Sewer backup and overland water are often separate coverages in Ontario, so check with your insurer. A backwater valve and sump pump can lower the risk of future claims.
Do you offer a warranty?
Yes. Every project comes with a written warranty on materials and workmanship. Terms depend on the service and are written into your contract.
Book a Free Basement Inspection in York
Tell us what is happening in your basement. We will find where water gets in, explain the Toronto subsidy and give you a written quote — no pressure, no obligation.
Call now — Mon–Fri 7 AM – 4 PM(416) 992-5858
Office: 58 Six Point Rd, Etobicoke, ON M8Z 2X2
Email: info@leaquida.ca
Licence No.: P94 4418977 (licensed contractor)