Basement Waterproofing Cost in Oshawa (2026)
Average cost in Oshawa
$4,500 — $32,000
$85 — $325 per sq ft
Cost Breakdown
ItemizedExcavation, installation, and site restoration
50%
Membranes, weeping tiles, and clear stone
25%
Excavator rentals and soil/debris removal
15%
Municipal fees and plumbing assessments
10%
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 Cost
InteractiveEstimated Cost
$6,592 — $9,888
Based on 12 sources and market data for Oshawa. Actual costs may vary depending on specific project requirements.
📈Price Momentum
Year-over-year~1 year ago
$11,201
Today
$11,739
Basement Waterproofing in Oshawa is ↑ 4.8% compared to roughly a year ago — about $538 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 providersAquaphobia Foundation Repair & Crack Injections
Bowmanville, ON L1C 5C9, Canada
112 reviews
Jetflo Drain & Waterproofing
1450 Hopkins St, Whitby, ON L1N 2C3, Canada
87 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 currently match Toronto's $6,650 subsidy, the Region of Durham offers a Basement Flooding Loan Program and specific rebates for backwater valves and sump pumps that can offset costs by $1,500 to $3,000 depending on the specific project and eligibility.
In 2026, interior waterproofing in Oshawa typically costs between $85 and $160 per linear foot, whereas exterior waterproofing—which requires full excavation—ranges from $180 to $325+ per linear foot.
Oshawa's prevalent 'heavy clay' and 'blue clay' soils increase labor costs by approximately 15-20% compared to sandy regions. Clay is harder to excavate and requires more expensive clear-stone backfill to ensure proper drainage to the weeping tiles.
A professional sump pump installation in Oshawa for 2026 averages between $1,200 and $3,500. This includes the basin, a high-quality cast-iron pump, and often a battery backup system, which is highly recommended due to local storm patterns.
📊Our Methodology
How we collect dataAggregated from 12+ 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.