Basement Waterproofing Cost in Ottawa (2026)

Ottawa's clay-heavy 'Leda soil' expands and contracts significantly during the 55+ annual freeze-thaw cycles. This increases the risk of foundation cracks and often requires more robust exterior membranes, pushing exterior costs toward the $150–$350 per linear foot range.

Yes, the Residential Protective Plumbing Program (RPPP) offers rebates up to $7,000. This includes up to $3,000 for a new sump pump with battery backup and $1,000–$2,500 for backwater valves, plus a 100% rebate on building permit fees.

Interior waterproofing typically costs $3,000–$10,000 ($70–$150/linear ft) and manages water after it enters. Exterior waterproofing is a preventative 'gold standard' costing $10,000–$35,000 ($150–$350/linear ft) due to the extensive excavation required.

For isolated leaks, high-pressure polyurethane or epoxy crack injections typically cost between $300 and $1,100 per crack in 2026, depending on the depth and width of the fissure.