How Much Does Basement Waterproofing Cost in Toronto?
In 2026, basement waterproofing in Toronto costs about $50–$120 per linear foot from the inside and $100–$250 per linear foot from the outside. Most projects fall between $3,000 and $35,000: a single leaking wall is often a few thousand dollars, while waterproofing a whole house from outside is at the top of that range.
These are the same prices we use on every page of this site and in our quotes. Below you will find our full price list, a basement waterproofing cost calculator, real examples and the Toronto subsidy that can bring the cost down.
Average cost at a glance
- Interior waterproofing: $50 – $120 / lin. ft
- Exterior waterproofing: $100 – $250 / lin. ft
- One 40-ft wall from inside: about $2,000 – $4,800
- One 40-ft wall from outside: about $4,000 – $10,000
- Full interior project: $3,000 – $18,000+
- Full exterior project: $10,000 – $35,000
Approximate 2026 Toronto prices. Exact price after a free inspection.
Waterproofing Cost Calculator
Choose the method, the length of wall and what applies to your home. The calculator uses our typical Toronto prices and shows a planning range, plus the City subsidy you may get back.
A planning estimate from our typical 2026 Toronto prices — not a quote. Your exact price is written in your quote after a free inspection.
Our Basement Waterproofing Prices (2026)
Typical price ranges for every service we offer in Toronto and the GTA. Each service page shows the same numbers.
| Service | Typical price | Typical project |
|---|---|---|
| Interior basement waterproofing | $50 – $120 per linear foot | $3,000 – $18,000+ |
| Exterior basement waterproofing | $100 – $250 per linear foot | $10,000 – $35,000 |
| Foundation crack repair (injection) | $500 – $1,500 per crack | Usually one visit |
| Structural crack repair with reinforcement | $800 – $2,500 per crack | $2,000 – $6,000 |
| Sump pump installation | $500 – $3,900 per unit | Replacement from $500; new pit $1,500 – $3,900 |
| Sump pump battery backup | $1,200 – $2,500 | City subsidy up to $300 |
| Sump pump discharge line | $500 – $2,500 | Install or reroute |
| Backwater valve installation | $2,000 – $4,200 per unit | Deep or difficult installs up to $5,500 |
| Window well replacement | $1,000 – $5,000 per well | Repairs from $200 |
| French drain / weeping tile | $20 – $120 per linear foot | Yard drain to interior basement drain |
| Full wet basement repair | Depends on the fix | $5,000 – $20,000+ |
| Crawl space encapsulation | From a floor vapour barrier to full system | $2,000 – $22,000 |
| Basement underpinning | $300 – $600 per linear foot | $40,000 – $100,000+ |
| Bench footing | $300 – $500 per linear foot | $24,000 – $50,000 |
| Basement walkout | Per project | $20,000 – $35,000+ |
| Egress window with wall cutout | $4,500 – $6,500 per window | Incl. window and well |
| Concrete basement floor resurfacing | $4 – $10 per sq. ft | $2,500 – $7,000 |
| Inspection & written quote | Free | — |
Approximate 2026 Toronto & GTA price ranges, not a quote. Prices include labour and materials for the work described; restoring decks, interlock, concrete or finished walls is quoted separately where needed.
Interior vs Exterior Waterproofing Cost
Waterproofing a basement from the inside usually costs about half as much per foot as waterproofing it from the outside — but they are not interchangeable.
| From inside (interior) | From outside (exterior) | |
|---|---|---|
| Cost per linear foot | $50 – $120 | $100 – $250 |
| 40-ft wall (example) | $2,000 – $4,800 | $4,000 – $10,000 |
| Typical full project | $3,000 – $18,000+ | $10,000 – $35,000 |
| What drives the price | Finished walls, floor thickness, new sump pit | Depth, access, decks/driveways, wall repairs |
| Typical duration | 2 – 5 days | 3 – 7 days |
| Best for | Floor–wall joint leaks, high water table, tight lots | Walls leaking in many places, finished basements |
Example rows are simple arithmetic from the per-foot ranges. Durations are typical for an average home and are written into your quote.
Three Typical Toronto Waterproofing Budgets
Worked examples using the prices above — your home will differ.
One leaking crack
Water seeps through a single wall crack in spring.
- Crack injection from inside
- No excavation, usually one visit
About $500 – $1,500
One wall from inside
Water at the floor–wall joint along one 40-ft wall, unfinished basement.
- 40 ft interior drainage: $2,000 – $4,800
- New sump pit + pump: $1,500 – $3,900
- Toronto subsidy on the pump: up to $1,200 – $2,250
About $3,500 – $8,700 before subsidy
Whole house from outside
Detached house, 140 ft of wall, walls leak in many places.
- 140 ft exterior waterproofing: $14,000 – $35,000
- Membrane, dimple board and new weeping tile included in the per-foot price
- Patio or deck restoration quoted separately
About $14,000 – $35,000
What Affects the Cost of Waterproofing a Basement
Method
Exterior costs more per foot because of excavation; interior needs the floor opened instead.
Linear footage
Most waterproofing is priced per foot of wall. Longer runs usually lower the cost per foot.
Finished basement
Drywall, flooring and built-ins along the walls must be removed and restored for interior work.
Access & obstacles
Narrow side yards, decks, driveways, stairs and AC units slow excavation.
Foundation depth & type
Deeper walls and stone or block foundations need more digging and repair.
Drainage outlet
A new sump pit, discharge line or backwater valve adds to the project but may qualify for a subsidy.
Real Leaquida job siteHow to Measure Linear Footage for a Waterproofing Estimate
The price per linear foot means the cost for each foot of foundation wall that gets waterproofed — measured along the wall, not the floor area.
- Measure the length of each wall that leaks, outside or inside
- Add the walls together for the total linear feet
- For a whole house, measure the full outside perimeter
- Note decks, driveways, stairs or patios along those walls
- Take photos of water marks, cracks and the sump pit if you have one
Not sure? You do not need to measure anything — we measure during the free inspection.
Toronto Basement Flooding Subsidy: Up to $6,650 Back
Toronto homeowners can get back 80% of the invoice for eligible flood protection work, up to these limits. The higher amounts started May 1, 2026 and apply to eligible work completed on or after November 12, 2025.
| Eligible work | Maximum subsidy |
|---|---|
| Home plumbing assessment | Up to $500 |
| Backwater valve (incl. alarm) | Up to $1,600 each, max. 2 |
| 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 |
Interior or exterior waterproofing itself is not covered; the devices above are, even when installed as part of a waterproofing job. Rules are set by the City and can change — check toronto.ca. We help you prepare the invoice details the City asks for.
Basement Waterproofing Estimates: What to Expect
Free inspection
We find where water gets in and measure the walls — no charge, no obligation.
Written quote
Method, linear footage, add-ons, price, schedule and warranty terms in writing.
Price agreed up front
The price in your contract is agreed before any work starts.
Subsidy help
For Toronto homes we itemize sump pumps and backwater valves for your subsidy claim.
Ways to keep the cost down
- Fix the leaking walls only, if the rest of the basement is dry
- Choose interior drainage where excavation would mean removing a driveway or deck
- Do the work before finishing the basement
- Claim the Toronto subsidy for sump pumps and backwater valves
- Extend downspouts and fix grading first — sometimes that solves minor dampness
Be careful with very low quotes
- Check what is included: membrane, dimple board, weeping tile, stone, backfill
- Ask whether crack repair and restoration are in the price
- Get the warranty in writing
- Make sure the contractor is licensed and insured
- A tar coat alone is damp-proofing, not waterproofing
See the Details for Each Service
Basement Waterproofing Cost: Questions & Answers
How much does basement waterproofing cost in Toronto?
About $50–$120 per linear foot for interior waterproofing and $100–$250 per linear foot for exterior waterproofing. Most projects cost $3,000–$35,000 depending on the method, the length of wall, access and how the basement is finished.
What is the average cost of waterproofing a basement?
For one wall of about 40 ft, interior waterproofing averages roughly $2,000–$4,800 and exterior $4,000–$10,000. A full interior project is usually $3,000–$18,000+ and a full exterior project $10,000–$35,000.
How much does it cost to waterproof a basement from the inside?
Interior waterproofing costs about $50–$120 per linear foot. A finished basement, a thick floor or a new sump pit moves the price toward the top of the range.
How much does it cost to waterproof a basement from the outside?
Exterior waterproofing costs about $100–$250 per linear foot, including excavation, membrane, dimple board, weeping tile and backfill. Deep foundations, tight access and decks or driveways in the way increase the cost.
What does price per linear foot mean?
It is the cost for each foot of foundation wall that is waterproofed, measured along the wall. Two 40-ft walls are 80 linear feet.
How accurate is the basement waterproofing cost calculator?
It gives a planning range based on our typical 2026 Toronto prices. The real price depends on what we find on site, so the exact number comes in a written quote after a free inspection.
Is interior waterproofing cheaper than exterior?
Usually yes — roughly half the cost per foot, because there is no excavation. But exterior waterproofing is the better fix when water comes through the walls in many places or the basement is finished.
Is the estimate free?
Yes. The inspection and written quote are free, with no obligation.
Does the Toronto subsidy cover basement waterproofing?
It does not cover the waterproofing itself, but it covers 80% of eligible devices installed with it: up to $2,250 for a sump pump, $300 for a battery backup, $1,600 per backwater valve (max. two), $400 for weeping tile severance and $500 for a plumbing assessment — up to $6,650 per property.
Does home insurance pay for basement waterproofing?
Insurance usually covers sudden damage, not preventive waterproofing. Sewer backup and overland water are often separate coverages in Ontario, so check your policy. Waterproofing and a backwater valve can reduce the risk of future claims.
How long does basement waterproofing take?
Interior waterproofing usually takes 2–5 days and exterior 3–7 days for an average home. Crack injection and sump pumps are usually one visit or one day.
Are there hidden costs?
Your written quote lists the full scope. Items that vary by home — restoring decks, interlock, concrete or finished walls, or a permit for a backwater valve — are listed separately so you can see them before you sign.
Get a Free Basement Waterproofing Estimate
The calculator gives you a range — we give you a number. Book a free inspection and get a written quote with the method, linear footage, price and warranty, plus the subsidy items itemized for Toronto homes.
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)