Looking to renovate your basement?

Are you looking to renovate your basement in Montréal in 2026 and want to know how much to budget before requesting quotes? For a complete finish, the budget generally ranges from around $60 to $110 per square foot in Quebec, depending on the condition of the basement, the materials, the layout, and whether or not a bathroom is added. A project of approximately 1,000 sq. ft. can therefore represent an investment of $65,000 to $95,000 for a complete standard-level renovation.

A basement offers a treasure trove of unique layouts, but converting it into a functional, livable space requires meticulous planning. Multiple factors need to be considered, particularly for long-term use, when it comes to ventilation, lighting, and material choices.

For a basement apartment (often referred to as a secondary suite) to be considered compliant in Canada in 2026, several requirements must generally be met, including those based on the National Building Code of Canada and applicable municipal bylaws. Common criteria typically include a minimum ceiling height of around 1.95 m (6 ft 5 in), egress windows providing a minimum unobstructed opening of approximately 0.35 m² per bedroom, and proper fire separation between units. That said, requirements can vary significantly depending on the province, municipality, and type of building. Failing to comply may lead to serious consequences, such as fines, insurance limitations, or restrictions on renting out the unit.