Basement Waterproofing Cost in Oshawa (2026)
Average cost in Oshawa
$2,500 – $25,000
$70 – $300 per sq ft
In Oshawa, the average is $9,997 and most projects cost between $2,500 and $25,000, or about $70 – $300 per sq ft. Prices are before tax and based on 12 sources.
Cost Breakdown
ItemizedManual or machine digging and backfilling
65%
Membranes, weeping tiles, and sealants
25%
Municipal building permits and site visits
5%
Waste removal and heavy machinery rental
5%
HST at 13%
📋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 project
LiveYour estimate in Oshawa
Likely range $4,499 – $21,993
- Labor & Excavation65%$6,498
- Materials25%$2,499
- Permits & Inspections5%$500
- Equipment & Disposal5%$500
Interior sealant
$9,997
Interior drainage / weeping tile
$15,995
Exterior excavation
$23,992
Calibrated to 12 researched sources for Oshawa. Before tax. Real quotes vary with site conditions.
📈Price Momentum
Year-over-year~1 year ago
$9,631
Today
$9,997
Basement Waterproofing in Oshawa is ↑ 3.8% compared to roughly a year ago — about $366 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 Oshawa
Verified providersClassic Waterproofing Oshawa
570 Montcalm Ave, Oshawa, ON L1J 2H1, Canada
41 reviews
Basement Waterproofing Oshawa
63 King St E, Oshawa, ON L1H 1B4, Canada
21 reviews
Dryshield Basement Waterproofing Oshawa
89 Varcoe Rd, Courtice, ON L1E 1N2, Canada
11 reviews
2 Dads Waterproofing Inc.
61 Bedell Crescent, Whitby, ON L1R 2N7, Canada
4 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
While Oshawa does not have a direct cash rebate like Toronto, residents can access the Durham Region Basement Flooding Loan Program, which provides interest-free loans up to $3,000 for three years to cover the installation of backwater valves and sump pumps.
In 2026, interior waterproofing typically costs between $70 and $150 per linear foot, while exterior waterproofing ranges from $150 to over $300 per linear foot due to the high cost of excavation and foundation exposure.
A professional sump pump installation in Oshawa currently averages between $1,200 and $3,000. This price includes the pump, basin, and discharge setup, with premium battery backup systems adding approximately $500 to $1,000 to the total.
Single foundation crack injections using polyurethane or epoxy typically cost between $800 and $1,300 per crack in 2026. However, if multiple cracks are present, contractors often recommend a full perimeter drainage system starting at $5,000.
📊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: 1 months 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.