Basement Waterproofing Cost in London (2026)
Average cost in London
$1,500 — $25,000
$50 — $300 per sq ft
Cost Breakdown
ItemizedExcavation, installation, and backfilling
60%
Membranes, weeping tiles, gravel, and pumps
30%
City of London plumbing and building permits
5%
Debris removal and landscape protection
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 Cost
InteractiveEstimated Cost
$6,080 — $9,120
Based on 12 sources and market data for London. Actual costs may vary depending on specific project requirements.
📈Price Momentum
Year-over-year~1 year ago
$9,287
Today
$10,030
Basement Waterproofing in London is ↑ 8.0% compared to roughly a year ago — about $743 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 London
Verified providersAdvanced Basement Systems
199 Exeter Rd Unit E, London, ON N6L 1A4, Canada
188 reviews
Classic Waterproofing London
229 Grand Ave, London, ON N6C 1M6, Canada
26 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 City of London Basement Flooding Grant Program covers up to 90% of eligible costs for specific protections. Caps include $1,800 for backwater valves, $4,000 for sump pits/pumps, and $1,400 for battery backups, for a total potential grant of up to $7,200.
In 2026, exterior waterproofing typically costs between $100 and $300 per linear foot due to excavation requirements. Interior drainage systems are more affordable, ranging from $50 to $150 per linear foot.
Yes, a City of London permit is mandatory for exterior excavation and any plumbing modifications like backwater valves or new sump pump connections. Plumbing permits typically cost between $150 and $300.
A standard sump pump and pit installation costs between $1,200 and $3,000. However, with the City of London's 90% grant, many homeowners pay as little as $150 to $300 out of pocket for eligible systems.
📊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.