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Basement Waterproofing Costs in the GTA: Interior vs Exterior Methods
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GTA Trades Daily
Monday, April 13, 2026 · 9 min read · 0 views
Breaking down the real costs of interior vs exterior waterproofing across the GTA, plus when each method makes sense.
Interior Waterproofing
Interior drainage systems (weeping tile + sump pump) cost $5,000–$12,000 for a typical GTA basement. This is the most common solution and works well for hydrostatic pressure issues.
Exterior Waterproofing
Full exterior excavation and membrane application runs $15,000–$35,000 depending on home size, depth, and landscaping complexity. This is the gold standard but significantly more disruptive and expensive.
Foundation Crack Repair
Individual crack injection costs $500–$1,500 per crack. This is a targeted fix, not a whole-basement solution. Most GTA homes built before 1990 will develop at least one foundation crack.
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