This foundation waterproofing cost calculator estimates the price of waterproofing a basement and replacing the weeping tile in Canada (low, typical and high, before tax), from the length to treat, the method and the options. Reference case, data reviewed in November 2026: 120 linear feet of exterior excavation, membrane and new weeping tile cost about $16,800 before tax in Quebec ($12,000 to $24,000), $21,600 in Ontario, $23,400 in British Columbia and $21,600 in Alberta. Prices currently cover: Quebec, Ontario, British Columbia and Alberta. The detailed budget is emailed to you as a PDF.
To receive your detailed budget, use the "Send this budget by email (PDF)" form on renoclair.ca.
Free independent toolBefore tax. With tax (typical):
Cost breakdown (typical)
| Item | Estimated amount |
|---|
Typical waterproofing costs by province (before tax)
| Work (before tax) | Low | Typical | High |
|---|---|---|---|
| Quebec : exterior membrane + weeping tile, 120 lin. ft | $12,000 | $16,800 | $24,000 |
| Quebec : interior weeping tile, 120 lin. ft | $9,000 | $13,200 | $19,200 |
| Ontario : exterior membrane + weeping tile, 120 lin. ft | $15,600 | $21,600 | $31,200 |
| Ontario : interior weeping tile, 120 lin. ft | $11,400 | $15,600 | $22,200 |
| British Columbia : exterior membrane + weeping tile, 120 lin. ft | $16,800 | $23,400 | $33,600 |
| British Columbia : interior weeping tile, 120 lin. ft | $12,600 | $17,400 | $24,600 |
| Alberta : exterior membrane + weeping tile, 120 lin. ft | $15,600 | $21,600 | $31,200 |
| Alberta : interior weeping tile, 120 lin. ft | $11,400 | $15,600 | $22,200 |
Before tax, November 2026. The table uses the same rates as the calculator.
Rates used by the calculator
| Province | Exterior (per lin. ft) | Interior (per lin. ft) | Crack injection (per lin. ft of crack) | Sump pump with battery | Backwater valve |
|---|---|---|---|---|---|
| Quebec | $140 | $110 | $55 | $1,750 | $1,300 |
| Ontario | $180 | $130 | $60 | $1,900 | $1,400 |
| British Columbia | $195 | $145 | $65 | $2,050 | $1,500 |
| Alberta | $180 | $130 | $60 | $1,900 | $1,400 |
Typical installed values, before tax.
Exterior or interior waterproofing?
Exterior waterproofing digs down to the footing, cleans the wall, applies a membrane and lays new weeping tile in clean stone: it stops water before it reaches the wall and is the most durable fix. Interior drainage collects water inside, at the base of the wall, and sends it to a sump pump; it costs less and avoids digging up the yard, but water still reaches the wall. Crack injection seals a single crack from inside with epoxy or polyurethane; enter the total crack length to price it.
What is included and what is not
- Included: excavation and backfill (exterior), membrane or dimple board, perforated drain pipe with filter fabric, clean stone and labour
- Options: sump pit and pump with battery backup, backwater valve, window well drainage
- Not included: landscaping, driveway or patio removal, structural crack repairs, underpinning, and iron ochre treatment
How the calculator calculates your estimate
The length you enter is multiplied by an installed rate per linear foot for the chosen method and province; options are added as lump sums. Quebec rates were aligned in November 2026 with our sourced French drain guide (most projects $100 to $150 per linear foot, up to about $250 for difficult sites). Other provinces use contractor price guides published in 2026: exterior work generally costs $100 to $300 per linear foot and interior drainage $70 to $200. Taxes are shown separately: 14.975% GST + QST in Quebec, 13% HST in Ontario, and 5% GST in British Columbia and Alberta. In BC, the contractor pays the 7% PST on materials and includes it in the price for work that becomes part of the house.
Worked example
A bungalow in Quebec with 140 linear feet of foundation, exterior waterproofing and a new sump pump: 140 × $140 + $1,750 = about $21,400 before tax. Keep a 10% to 15% contingency for cracks or iron ochre found once the wall is exposed.
Permits, utility locates and rules
- Always have underground utilities located before digging: Info-Excavation in Quebec, Ontario One Call, BC 1 Call, Utility Safety Partners in Alberta.
- A permit may be needed for a new sump pump connection, a backwater valve or work near the property line; check with your city.
- In Quebec, the contractor must hold a Régie du bâtiment du Québec (RBQ) licence.
Rebates
Several cities subsidize backwater valves and sump pumps to reduce basement flooding, including Toronto and Quebec City. Amounts and conditions change by city: check your municipality’s program before the work.
Which provinces are covered?
Quebec, Ontario, British Columbia and Alberta.
Limitations
- This is a planning estimate, not a quote.
- Depth, soil, access and obstacles (stairs, decks, driveways) change the price a lot.
- The budget is sent as a PDF by email; the page has no print button.
Sources, review date and data version
- Info-Excavation (Quebec)
- Ontario One Call
- BC 1 Call
- Utility Safety Partners (Alberta)
- Price sources: contractor price guides published in 2026 (not named on this page); see sources and methodology.
- Data version 2026.Q4-foundation-2, reviewed November 13, 2026. Next review: February 2027.
Related guides and calculators
- Basement Renovation Cost Calculator
- Basement insulation in Canada
- Radon test for Canadian homes
- Radon mitigation system cost
- Deck Cost Calculator
- All renovation cost calculators
Frequently asked questions
How much does foundation waterproofing cost?
For 120 linear feet of exterior waterproofing with new weeping tile, about $16,800 before tax in Quebec, $21,600 in Ontario, $23,400 in British Columbia and $21,600 in Alberta (November 2026).
What is the cost per linear foot?
Typical exterior rates: $140 per linear foot in Quebec and $180 in Ontario; interior drainage costs less.
Is interior waterproofing enough?
It controls water that gets in but does not keep the wall dry. It is a good option when outside access is impossible or the budget is limited.
How do I know if my weeping tile needs replacing?
Water at the base of the wall after heavy rain, efflorescence, a musty smell or a camera inspection that shows a crushed or blocked pipe are the usual signs.
Do I need to locate utilities before digging?
Yes, always. The locate service is free in every province.
How do I get the budget as a PDF?
Run the calculation, enter your email address and accept the consent box: the PDF arrives by email within a few minutes.
When are prices updated?
Every three months; these prices were reviewed in November 2026.