Basement Finishing Cost in London (2026)
Average cost in London
$15,000 — $120,000
$32 — $80 per sq ft
Cost Breakdown
ItemizedFraming, drywall installation, and project management
50%
Flooring, drywall, insulation, and trim
30%
Wiring, lighting, and bathroom rough-ins
12%
City of London building and ESA permits
3%
Emergency fund for structural or moisture issues
5%
HST at 13%
📋What's Included
ScopeTypically Includes
- Framing & drywall
- Basic flooring (LVP or carpet)
- Electrical (outlets & lighting)
- Egress window (if required)
- Painting
- Basic bathroom rough-in
Typically Excludes
- Full basement bathroom
- Built-in bar or kitchen
- Home theater wiring
- Waterproofing (separate cost)
- Permits & inspections
Assumes an unfinished basement with existing concrete floor and basic utilities.
🧮Estimate Your Cost
InteractiveEstimated Cost
$26,340 — $39,510
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
$52,083
Today
$55,000
Basement Finishing in London is ↑ 5.6% compared to roughly a year ago — about $2,917 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 Basement Finish Contractors in London
Verified providersGold Level Contracting
288 Grangeover Ave, London, ON N6G 4K5, Canada
52 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 requires a permit for finishing a basement to create living space. For 2026, the fee is approximately $0.72 per sq ft with a minimum permit fee of $260.37.
Adding a standard 3-piece bathroom typically costs between $10,000 and $25,000, depending on the complexity of the plumbing and whether rough-ins are already present.
A legal secondary suite in London for 2026 ranges from $50,000 for basic legalization to over $120,000 for high-end finishes, including required fire separation and separate entrances.
Most professional projects take 6 to 12 weeks. However, complex renovations involving waterproofing or structural changes can extend the timeline to 6 months.
A professionally finished basement in London can increase home resale value by approximately 10% to 15%, often adding $40,000 to $60,000 in immediate equity.
📊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 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.