In 2026, the average cost of basement waterproofing in Toronto ranges from $70 to $250+ per linear foot. Interior waterproofing systems typically cost between $70 and $150 per linear foot, while professional exterior waterproofing ranges from $150 to $250+ per linear foot. Total project costs for a standard GTA home usually fall between $5,000 and $20,000+ depending on excavation depth and foundation accessibility.
5 Factors That Influence Your Waterproofing Cost
Foundation Depth: Excavating a 9ft foundation requires more shoring and labor than a standard 6ft footer.
Accessibility: Hand-digging in narrow downtown Toronto alleys increases labor costs compared to machine excavation.
Soil Composition: Toronto’s “heavy clay” (common in Etobicoke and Mississauga) is harder to dig and requires more clear-stone backfill.
Hardscaping: Removing and restoring concrete patios, interlock, or decks adds to the total estimate.
Subsidies: Homeowners can reduce costs by up to $6,650 through the City of Toronto Basement Flooding Protection Subsidy.
Basement waterproofing is commonly priced as a waterproofing price per linear foot. Interior waterproofing cost per linear foot is often lower because it typically avoids excavation. Exterior waterproofing cost per linear foot is usually higher because it involves more labour for digging, wall prep, waterproof membranes, drainage improvements, and restoration.

