Basement Finishing Cost in Oshawa (2026)
Average cost in Oshawa
$30,000 — $130,000
$55 — $130 per sq ft
Cost Breakdown
ItemizedSkilled trades and general contracting
50%
Drywall, flooring, and finishes
35%
Plumbing, Electrical, and HVAC
10%
City fees and BCIN drawings
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
$28,356 — $42,534
Based on 18 sources and market data for Oshawa. Actual costs may vary depending on specific project requirements.
📈Price Momentum
Year-over-year~1 year ago
$68,215
Today
$70,603
Basement Finishing in Oshawa is ↑ 3.5% compared to roughly a year ago — about $2,388 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
27 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 a basement. Permit fees increased by 3% on January 1, 2026, and typically range from $400 for basic projects to over $2,000 for legal suites including drawings.
In 2026, a fully permitted legal secondary suite in Oshawa typically costs between $70,000 and $110,000. This includes mandatory fire separations, egress windows, and a separate entrance.
Homeowners can expect a 70% to 80% return on investment at resale. For legal rental suites, monthly income in the Durham Region averages $1,800 to $2,600, offering a typical payback period of 4 to 6 years.
Under the 2026 Ontario Building Code, a legal basement suite must maintain a minimum ceiling height of 1.95 meters (approximately 6 feet 5 inches) over at least 75% of the required floor area.
📊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: today. 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.