Basement Waterproofing Cost in Ottawa (2026)
Average cost in Ottawa
$3,000 — $25,000
$70 — $300 per sq ft
Cost Breakdown
ItemizedExcavation, backfilling, and installation
45%
Membranes, weeping tiles, and gravel
35%
Repairing sod, interlock, or concrete
12%
City of Ottawa building and plumbing permits
5%
Soil removal and site remediation
3%
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
$6,400 — $9,600
Based on 11 sources and market data for Ottawa. Actual costs may vary depending on specific project requirements.
📈Price Momentum
Year-over-year~1 year ago
$11,433
Today
$11,764
Basement Waterproofing in Ottawa is ↑ 2.9% compared to roughly a year ago — about $332 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 Ottawa
Verified providersBraden Foundation Construction
5300 Ramsayville Rd, Ottawa, ON K1G 3N4, Canada
103 reviews
Wet Basement Solutions
3591 Innes Rd #4, Orléans, ON K1C 1T1, Canada
119 reviews
Wet Basement Solutions - Dry Basements, For Life
915 Ramsay Concession Rd 1, Carleton Place, ON K7C 0C5, Canada
143 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, through the Residential Protective Plumbing Program (RPPP). In 2026, homeowners can receive up to $3,000 for a new sump pump installation with battery backup and $1,000 for a backwater valve. Building permit fees (approx. $117+) are also 100% covered under this program.
Interior waterproofing typically costs between $70 and $230 per linear foot, while exterior excavation waterproofing is more intensive, ranging from $100 to $300 per linear foot. A standard 1,000 sq ft basement (~140 linear feet) averages $10,000–$15,000 for interior and $15,000–$25,000+ for exterior.
Yes, a permit is required for exterior excavation deeper than 4 feet or any work involving the installation of a sump pump or backwater valve. The fee is $12.75 per $1,000 of construction value, with a minimum fee of $117.00.
For isolated leaks, a professional polyurethane or epoxy crack injection typically costs between $600 and $1,500 per crack, depending on the depth and accessibility of the foundation wall.
📊Our Methodology
How we collect dataAggregated from 7+ 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.