Basement Waterproofing Cost in Montreal (2026)
Average cost in Montreal
$3,000 — $15,000
$5 — $10 per sq ft
Cost Breakdown
ItemizedExcavation and installation
50%
Membranes, sealants, pipes
35%
Machinery and disposal
10%
Municipal permits
5%
GST+QST at 14.98%
📋What's Included
ScopeTypically Includes
- Interior drain tile system
- Sump pump installation
- Vapor barrier
- Crack injection sealing
- Labor
Typically Excludes
- Exterior excavation waterproofing
- Foundation repair
- Mold remediation
- Dehumidifier
- Landscaping restoration
Based on interior waterproofing for a standard 800-1,000 sq ft basement.
🧮Estimate Your Cost
InteractiveEstimated Cost
$5,888 — $8,832
Based on 6 sources and market data for Montreal. Actual costs may vary depending on specific project requirements.
🏢Top Waterproofing Contractors in Montreal
Verified providersDELTA WATERPROOFING
1155 Boul. René-Lévesque O Suite 2500, Montréal, QC H3B 4P7, Canada
111 reviews
DCR Renovation & Construction Montreal
3422 Bd Décarie, Montréal, QC H4A 3J5, Canada
595 reviews
Provider data sourced from public business directories. Ratings and reviews are public and may change. LookupCost is not affiliated with listed providers.
💬What People Actually Paid
Community❓Common Questions
On average, homeowners in Montreal pay between $3,000 and $10,000 for standard basement waterproofing. However, extensive exterior excavation and French drain installations can push costs between $15,000 and $30,000.
The cost typically ranges from $5 to $10 per square foot. Interior solutions are generally on the lower end, while exterior waterproofing with excavation falls on the higher end.
Interior waterproofing in Canada averages $70 to $230 per linear foot, whereas exterior waterproofing, which involves digging around the foundation, costs between $100 and $300 per linear foot.
Yes, significant foundation work and exterior excavation require municipal permits in Montreal. Renovation permits typically cost between $500 and $2,000 depending on the project's scope.
📊Our Methodology
How we collect dataAggregated from 6+ verified web sources and cost databases
Licensed contractor estimates and regional cost guides
Government construction and labor statistics
Community-reported project costs and reviews
Last data collection: today. Updates run weekly. All costs in CAD.