Basement Finishing Cost in Oshawa (2026)
Average cost in Oshawa
$25,000 — $125,000
$50 — $130 per sq ft
Cost Breakdown
ItemizedSkilled trades and general labor
45%
Drywall, flooring, lighting, and lumber
35%
Architectural drawings and project oversight
7%
City of Oshawa building and ESA permits
3%
Buffer for unexpected structural or moisture issues
10%
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
$57,142
Today
$60,342
Basement Finishing in Oshawa is ↑ 5.6% compared to roughly a year ago — about $3,200 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 providersBuilding Problems Solver Inc.
745 Downview Crescent, Oshawa, ON L1H 7W4, Canada
26 reviews
Nash Reno Services
536 Nottingham Crescent, Oshawa, ON L1K 2V6, Canada
25 reviews
Pristine Contracting Inc.
285 Taunton Rd E, Oshawa, ON L1G 3V2, Canada
23 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. In 2026, the City of Oshawa requires a building permit for finishing a basement, adding a dwelling unit, or making structural, heating, or plumbing changes. Cosmetic work like painting or replacing floor finishes generally does not require one.
Permit fees in Oshawa increased by 3% on January 1, 2026. For a standard residential basement finish, homeowners should budget between $500 and $1,500 depending on the complexity and whether a secondary suite is being added.
A basic finishing project typically takes 4–6 weeks. A mid-range project with a bathroom takes 6–10 weeks, while a full legal basement apartment can take 12–20 weeks including permit approvals.
A legal basement apartment requires fire separation, egress windows, and separate HVAC controls, typically pushing the cost to a range of $95,000 to $150,000, or approximately $100 per square foot.
📊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: 3 days 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.