Basement renovation covers everything from finishing an unfinished space for the first time to gutting and rebuilding one that's outdated, damp, or damaged. In Toronto that usually means dealing with things a lot of other renovation jobs don't have to: waterproofing and moisture control, egress window requirements if you're adding a bedroom, ceiling height limits under old joists, underpinning or bench footings if you want more headroom, and permits for secondary suites or rental units. We've listed 34 contractors in this category who work on basements across the city, from small legalization projects to full-scale finished suites with kitchens and bathrooms.
What's typically included
- Moisture and water management: sump pumps, weeping tile repair, vapor barriers, and interior or exterior waterproofing
- Framing, insulation, and drywall suited to below-grade conditions
- Electrical and plumbing rough-in, often including a new bathroom or wet bar
- Flooring choices that tolerate humidity, such as engineered hardwood, vinyl plank, or tile
- Permit work for egress windows, ceiling height, and separate entrances when the goal is a legal basement apartment
What to look for in a contractor
Ask whether they've pulled permits for basement work in Toronto before, since inspectors look closely at egress windows, ceiling heights, and fire separation for secondary suites. Ask how they handle moisture: a contractor who wants to skip a proper vapor barrier or ignores an existing dampness problem is setting you up for mold later. Get a clear written scope covering demolition, disposal, and what happens if they find asbestos, knob-and-tube wiring, or foundation cracks once walls are opened up, since these surprises are common in older Toronto homes. Ask for references from jobs completed at least a year ago, not just recent ones, since basement problems (leaks, cracking, smells) tend to show up over time.
How our scoring works
Each contractor on this page is scored using consistent, publicly available signals rather than paid placement, so you can compare businesses on the same basis. For the full rundown of what we measure and how, see our methodology page. If you want our editorial picks rather than the full list, check the ranked guide to the best renovation contractors in Toronto, which covers basement specialists alongside kitchen, bathroom, and whole-home renovators.
