Basement Finishing Cost in Oshawa (2026)
Average cost in Oshawa
$32,000 — $115,000
$45 — $110 per sq ft
Cost Breakdown
ItemizedDrywall, flooring, paint, and fixtures
45%
Framing, electrical, and plumbing trades
35%
Oshawa building permits and architectural drawings
10%
Unforeseen structural or moisture repairs
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 8 sources and market data for Oshawa. Actual costs may vary depending on specific project requirements.
📈Price Momentum
Year-over-year~1 year ago
$52,685
Today
$55,635
Basement Finishing in Oshawa is ↑ 5.6% compared to roughly a year ago — about $2,950 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 providersPristine Contracting Inc.
285 Taunton Rd E, Oshawa, ON L1G 3V2, Canada
25 reviews
Building Problems Solver Inc.
745 Downview Crescent, Oshawa, ON L1H 7W4, 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
In 2026, a standard 1,000 sq ft basement renovation in Oshawa typically costs between $45,000 and $95,000, depending on whether a bathroom or kitchenette is included.
Oshawa building permit fees for a legal secondary suite generally range from $1,500 to $3,500, plus an additional $1,500 to $4,500 for required professional architectural drawings.
Adding a new 3-piece bathroom typically costs between $15,000 and $30,000. This includes roughly $3,500 to $7,000 for the plumbing rough-in, which often requires cutting into the concrete slab.
Yes, the City of Oshawa requires a building permit for any project that alters the interior layout, adds plumbing, or involves structural changes. Simple cosmetic updates like replacing flooring do not require a permit.
📊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 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.