Finishing a basement in Canada costs $25,000–$60,000 for a typical 800–1,200 sq ft space, depending on finishes and whether you add a bathroom.
Prices are estimates in CAD based on typical residential jobs. Actual costs vary by scope and conditions.
Basement apartments are a significant rental income source in many Canadian cities. Toronto, Ottawa, and other municipalities have specific requirements for legal basement suites including separate entrances, egress windows, and fire separation. Building to code from the start avoids costly retrofits. In Ontario, check municipal second suite bylaws before starting.
Basement finishing involves framing, electrical, plumbing (if adding a bathroom), insulation, drywall, and flooring — multiple trades that need coordination. A general contractor who manages the project is the standard approach.