Basement Finishing Cost in Oshawa (2026)
Average cost in Oshawa
$15,584 — $187,950
$45 — $110 per sq ft
Cost Breakdown
ItemizedSkilled trades and general labor
45%
Drywall, flooring, framing, and trim
35%
Rough-ins, fixtures, and ESA inspections
12%
City of Oshawa fees and BCIN drawings
5%
Buffer for unforeseen structural issues
3%
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
$28,356 — $42,534
Based on 9 sources and market data for Oshawa. Actual costs may vary depending on specific project requirements.
📈Price Momentum
Year-over-year~1 year ago
$61,213
Today
$64,641
Basement Finishing in Oshawa is ↑ 5.6% compared to roughly a year ago — about $3,428 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 Oshawa
Verified providersLilium Design & Build | Renovation Contractor Whitby
119 Ferguson St, Whitby, ON L1N 2X7, Canada
41 reviews
Building Problems Solver Inc.
745 Downview Crescent, Oshawa, ON L1H 7W4, Canada
25 reviews
Nash Reno Services
536 Nottingham Crescent, Oshawa, ON L1K 2V6, Canada
25 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 Oshawa requires a building permit for finishing basements, changing floor plans, or moving plumbing. Fees typically range from $500 to $2,000 depending on the project scope.
According to the Ontario Building Code and Oshawa bylaws, a finished basement must have a minimum ceiling height of 6 ft 11 in (210 cm), though it can be reduced to 6 ft 5 in under beams and ducts.
Converting a basement into a legal secondary suite in Oshawa typically costs between $80,000 and $140,000 in 2026, as it requires fire-rated separations, egress windows, and separate HVAC controls.
Homeowners in Oshawa can expect a 70% to 75% return on investment (ROI) at resale, with a $75,000 renovation typically adding over $52,000 to the home's appraised value.
📊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.