Basement Waterproofing Cost in Montreal (2026)
Average cost in Montreal
$5,000 — $45,000
$120 — $400 per sq ft
Cost Breakdown
ItemizedHeavy machinery and site prep
35%
Piping, gravel, and geotextile
25%
Delta-MS or elastomeric coating
20%
Specialized foundation crew
15%
Municipal fees and debris removal
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 8 sources and market data for Montreal. Actual costs may vary depending on specific project requirements.
📈Price Momentum
Year-over-year~1 year ago
$15,097
Today
$15,883
Basement Waterproofing in Montreal is ↑ 5.2% compared to roughly a year ago — about $785 more on the average project.
Comparison derived from the year-over-year change rate, not a month-by-month price index. We don't store historical snapshots yet — when we do, this will become a real time series.
🏢Top Waterproofing Contractors in Montreal
Verified providersDELTA WATERPROOFING
1155 Boul. René-Lévesque Ouest Suite 2500, Montréal, QC H3B 4P7, Canada
113 reviews
DCR Renovation & Construction Montreal
3422 Bd Décarie, Montréal, QC H4A 3J5, Canada
585 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
In 2026, the cost for a professional French drain installation in Montreal typically ranges from $150 to $350 per linear foot, including excavation and membrane application.
A standard polyurethane or epoxy crack injection costs between $650 and $1,100 per crack. If exterior excavation is required for the repair, costs can rise to $1,800 - $2,400 per section.
Yes, interior systems generally cost $80 to $150 per linear foot, whereas exterior waterproofing ranges from $120 to $400 per linear foot due to the high cost of excavation and landscaping restoration.
While programs vary by borough, many Montreal municipalities offer rebates for flood prevention, such as $500 to $2,240 for sump pump and backwater valve installations to mitigate sewer backup risks.
📊Our Methodology
How we collect dataAggregated from 5+ 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: 2 weeks ago. Updates run weekly. All costs in CAD.
About this data
Cost figures are estimates synthesized from public market data using AI research and refreshed regularly. Real project costs vary by scope, materials, contractor, and site conditions. Always get verified quotes from licensed contractors for your specific project.
Spotted bad data? Let us know — we'll review and update.