Basement Finishing Cost in Montreal (2026)

In 2026, finishing a 1,000 sq ft basement in Montreal typically costs between $36,750 and $65,000. A basic finish without a bathroom will be on the lower end, while adding a 3-piece bathroom or custom features can push the cost above $60,000.

Yes, the City of Montreal requires permits for basement renovations, especially when adding plumbing, electrical systems, or bedrooms. Permit fees generally range from $500 to $2,000 depending on the scope of work.

Adding a bathroom to your basement renovation in Montreal typically adds $10,000 to $25,000 to your total project cost. This includes plumbing rough-ins, ventilation, waterproofing, and fixtures.

The average cost ranges from $40 to $85 per square foot. Basic open-concept finishes sit around $40 to $50 per sq ft, while high-end remodels with custom cabinetry, home theaters, or legal rental suites can exceed $85 per sq ft.