Basement Waterproofing Cost in Montreal (2026)
Average cost in Montreal
$1,500 — $28,000
$100 — $350 per sq ft
Cost Breakdown
ItemizedManual and mechanical digging
45%
Membranes, PVC pipes, gravel
30%
Mini-excavator rental and soil removal
10%
Installation and backwater valves
10%
Municipal fees and engineering
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
$9,354
Today
$9,775
Basement Waterproofing in Montreal is ↑ 4.5% compared to roughly a year ago — about $421 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
112 reviews
DCR Renovation & Construction Montreal
3422 Bd Décarie, Montréal, QC H4A 3J5, Canada
587 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
Yes, the RénoPlex program provides financial assistance for flood protection work, including the installation of backwater valves and sump pits. Additionally, the Rénoclimat program offers grants for foundation insulation and sealing that can offset costs by $200 to $2,000.
For residential buildings, the minimum permit fee is $167.40. However, the total cost is calculated at $9.80 for every $1,000 of estimated work. For a typical $15,000 exterior project, expect to pay approximately $314 for the permit.
Iron ochre is common in certain Montreal soils (like the North Shore). Specialized French drain systems designed to resist clogging from iron bacteria typically cost 25-30% more than standard installations, ranging from $125 to $400 per linear foot.
Exterior waterproofing is the gold standard in Montreal due to the freeze-thaw cycles. While interior systems are cheaper ($70-$230/linear ft), exterior excavation ($100-$350/linear ft) protects the foundation wall itself from structural damage caused by water expansion in winter.
📊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: 4 days 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.