What it costs
Exterior waterproofing for a 750–1,000 sq ft basement typically costs $10,000–$15,000. Component prices: exterior French drain about $30–$90 per linear foot and waterproof membrane $4–$7 per square foot.
Source: HomeGuide: basement waterproofing cost. Price your basement with the cost estimator.
Worth knowing
- Keeps water off the outside face of the wall
- Means excavating to the footing, so landscaping and decks may be disturbed
- Lets cracks be sealed from the outside
- Frozen ground limits when digging can happen
What to send contractors
- Which walls leak
- What is next to those walls: driveway, deck, garden, neighbour
- Basement depth and wall type
Questions
Do I need to dig all the way around?
Not always. If one or two walls leak, contractors often quote just those sides. Ask each one to explain why they recommend the length they quote.
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