Basement Renovation in Markham, ON

Basement renovation costs in Markham typically range from $20,000 to $70,000 depending on the size, whether you're adding a bathroom or kitchen, and the quality of finishes. A basic basement finishing with flooring, drywall, and lighting usually costs $20,000 to $35,000, while a full basement apartment conversion with a separate entrance can reach $50,000 to $70,000 or more.

Yes, basement renovations in Markham require building permits from the City of Markham Building Standards for framing, electrical, plumbing, and HVAC work. If you're creating a basement apartment, additional permits and inspections are required to ensure it meets fire code, egress, and the Ontario Building Code. We handle the entire permit process for you.

Yes, we build legal basement apartments in Markham that comply with the Ontario Building Code, fire code, and local zoning bylaws. This includes proper egress windows, fire separation, separate mechanical systems, and — where required — a separate entrance. The City of Markham building standards department issues permits and follows the Ontario Building Code.

Before any finishing work, we conduct a thorough moisture assessment of your Markham basement. Solutions may include interior weeping tile and sump pump installation, crack injection, exterior waterproofing, and high-quality vapour barriers. We never finish over moisture problems — we fix them first to protect your investment.

A typical basement renovation in Markham takes 4 to 8 weeks depending on the scope. Basic finishing (framing, drywall, flooring, lighting) usually takes 4 to 5 weeks. Full basement apartment conversions with bathrooms, kitchens, and separate entrances can take 6 to 8 weeks. We provide a detailed schedule with your estimate.