Basement Waterproofing for North York Homes
Leaquida provides basement waterproofing in North York — from Lawrence Park and Bedford Park to Willowdale, Don Mills, Downsview and the Jane–Finch area. We are a licensed Toronto contractor with our own crew, based in Etobicoke.
Our waterproofing services in North York cover the whole job: a free inspection, 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.
North York has many rebuilt homes with deep basements next to older bungalows, and both can leak for different reasons. We find the cause first and explain how the Toronto subsidy can cover part of the cost.
North 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 — North 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 North York Basements Take on Water
North York sits on the ravines of the West and East Don, Black Creek and the Humber. Clay soils, old weeping tile and deep new basements make leaks common across the area.
River valleys
The West Don, East Don, German Mills Creek, Wilket Creek and Black Creek keep groundwater high near the ravines.
Dense clay
Much of North York sits on clay-rich soil that drains slowly and holds water against foundation walls.
Deep rebuilt basements
Many lots now have new homes with deeper basements than the bungalows they replaced, so they sit closer to groundwater.
Ageing weeping tile
1940s–60s bungalows often still have clay weeping tile that is cracked, shifted or full of roots.
Flash floods
On August 19, 2005, Black Creek flooded after extremely heavy rain and destroyed the culvert under Finch Avenue West.
Summer cloudbursts
On July 16, 2024, Toronto saw more than a month’s worth of rain in about three hours, overloading sewers across the city.
Real Leaquida job siteNorth York Knows What a Flash Flood Can Do
- August 19, 2005: Black Creek overflowed and washed out the Finch Avenue West culvert — one of Toronto’s most famous flood events.
- July 16, 2024: more than a month’s rain fell in hours across Toronto, causing widespread basement flooding.
- The City of Toronto runs basement flooding studies and sewer upgrades across North York neighbourhoods.
- Devices at the house — a backwater valve, sump pump and working weeping tile — are what protect your basement when the street sewer is overloaded.
We check whether your floor drain, sewer lateral and weeping tile are part of the problem before we recommend waterproofing the walls.
Sources: Black Creek (Toronto) and the City of Toronto basement flooding program.
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 North York Neighbourhoods
North York mixes 1920s–40s neighbourhoods, post-war bungalows, the planned community of Don Mills and newer infill — so basement problems change from street to street.
| Area | Typical homes | What we often check first |
|---|---|---|
| Lawrence Park, Bedford Park, Lytton Park | 1920s–40s brick homes, many renovated | Wall seepage, old clay tile, underpinned basements — exterior membrane, crack repair |
| Willowdale, Lansing, Newtonbrook | Post-war bungalows and new rebuilt homes | Deep new basements, window wells, sump pumps |
| Don Mills, Parkwoods, Victoria Village | 1950s–60s planned homes | Failed weeping tile, floor–wall joint leaks |
| York Mills, Bayview Village, St. Andrew | 1950s–70s larger homes near the Don | High groundwater near ravines, exterior waterproofing |
| Downsview, Bathurst Manor, Wilson Heights | 1950s–60s bungalows and semis | Cracks, floor drains, sewer backup |
| Jane–Finch, Humber Summit, Emery | 1960s–70s houses and townhouses | Backwater valves, sump pumps — close to Black Creek and the Humber |
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 North York
From $100 / lin. ftExterior Basement Waterproofing
Excavation to the footing, membrane, drainage board and new weeping tile — water never reaches the wall.
Learn more →
From $50 / lin. ftInterior Basement Waterproofing
Drainage under the floor along the walls and a sealed sump pump — no digging in your yard.
Learn more →
$500 – $1,500 / crackFoundation Crack Repair
Injection that seals leaking foundation cracks from the inside, usually in one visit.
Learn more →
From $500 / unitSump Pump Installation
Sealed basin, reliable pump, discharge line and optional battery backup.
Learn more →
From $50 / lin. ftWeeping Tile & French Drains
New perforated weeping tile in clear stone to replace clogged or broken tile.
Learn more →
From $200Window Well Installation
Window wells with a proper drain so basement windows stop leaking.
Learn more →How Much Does Basement Waterproofing Cost in North York?
Typical 2026 price ranges for North 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.
Example: subsidy on two devices
- Backwater valve $3,000 → up to $1,600 back
- Sump pump $2,500 → up to $2,000 back (80%)
- Battery backup → up to $300 more
Up to 80% of the invoice, within the City’s limits — not a quote.
Toronto Basement Flooding Subsidy for North York Homes
North 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 North 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 North 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
- North York was its own city until it joined Toronto in 1998, so City of Toronto permits and subsidies apply.
- Don Mills, built from the 1950s, is often called Canada’s first fully planned suburban community.
- Black Creek starts in Vaughan and flows through North York to the Humber River.
- Postal codes we serve: M2H, M2J, M2K, M2L, M2M, M2N, M2P, M2R, M3A, M3B, M3C, M3H, M3J, M3K, M3L, M3M, M3N, M4A, M5M, M6A, M6B, M6L, M9L, M9M.
Buying an older home in North York? Ask whether the basement was ever underpinned or lowered, when the weeping tile was replaced 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.
North York Neighbourhoods We Serve
Also serving nearby
Basement Waterproofing in North York: Questions & Answers
How much does basement waterproofing cost in North York?
Interior waterproofing usually costs $50–$120 per linear foot and exterior waterproofing $100–$250 per linear foot. Most full projects in North York fall between $3,000 and $35,000. The inspection and written quote are free.
Can North York homeowners get the Toronto basement flooding subsidy?
Yes. North 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 North 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 new home in North York has a deep basement and still leaks. Why?
Deeper basements sit closer to groundwater, and window wells and reverse-slope areas collect water. We usually check the weeping tile, sump pump and window well drains first, then the walls.
Is interior or exterior waterproofing better for my North 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 North 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 North 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) 992-5858Office: 58 Six Point Rd, Etobicoke, ON M8Z 2X2
Email: info@leaquida.ca
Licence No.: P94 4418977 (licensed contractor)