Basement Renovation — Toronto & the GTA
A finished basement is the most cost-effective way to add usable living space to a GTA home — whether that's a family room, a legal rental suite, or a lowered, underpinned floor with full ceiling height. We handle basement renovations across Toronto, Mississauga, and the wider GTA, from waterproofing and permits through to the final finishes. If you are searching for a basement renovation contractor near you in the Toronto area, start here for a real scope and quote.
Basement renovations, from finishing to legal suites
Basement Finishing
Turn bare concrete into a warm, code-compliant living space — framing, insulation, drywall, flooring, and lighting, with moisture control handled before any finishing begins.
Legal Secondary & Basement Suites
Self-contained basement apartments built to Ontario Building Code — separate entrance, egress, fire separation, and ceiling height — so the unit is legal and rentable.
Underpinning & Bench Footing
Lower the basement floor to gain full ceiling height. We coordinate the engineering and excavation for underpinning or bench footing safely beneath the existing foundation.
Walkout Basements
Add a grade-level or walkout entrance for light, accessibility, and a separate suite entry, with proper grading and waterproofing at the new opening.
Basement Bathrooms
Add a full or half bath below grade, including the drainage and waterproofing details that below-grade plumbing requires.
Waterproofing & Moisture Control
Interior and exterior waterproofing, sump and backwater valve work, and vapour control so the finished space stays dry for the long term.
Recent Renovation Work
These projects show the quality and detail we bring to interior renovations, including basement and below-grade spaces, across Toronto and the GTA.
How it works
Scope & Assessment
We assess the existing basement — ceiling height, moisture, foundation, and what you want the space to do — and produce a clear written scope before anything starts.
Permits, Engineering & Waterproofing
Where the work adds a suite, bathroom, underpinning, or a walkout, we handle permits and engineering, and address waterproofing before the space is closed in.
Build, Inspect & Finish
Framing, mechanical rough-ins, insulation, and finishing proceed in order with inspections at the required milestones, ending in a fully finished, dry space.
Frequently Asked Questions
How much does a basement renovation cost in Toronto?
Basement renovations in the Toronto area typically run from about $35,000 to $80,000 for finishing an existing space. A legal basement apartment usually lands between $80,000 and $150,000 or more, and underpinning to gain ceiling height adds roughly $60,000 to $120,000. We provide a written quote after a site visit so the figure matches your basement and goals.
Do I need a permit to finish a basement in Toronto?
It depends on the work. Cosmetic finishing of an existing space may not require a permit, but adding a bedroom, a bathroom, a separate suite, underpinning, or a walkout entrance does. We confirm the requirements and handle the permit applications as part of the project.
What makes a basement apartment legal in Toronto?
A legal basement apartment in Ontario must meet the Ontario Building Code: a minimum ceiling height, compliant egress (a proper means of escape such as an egress window or exit), fire separation between units, a separate entrance, and required smoke and carbon-monoxide alarms. We build to these requirements and coordinate the inspections.
What is underpinning and do I need it?
Underpinning lowers your basement floor by extending the foundation deeper, which is how you gain full ceiling height in an older home with a low basement. It is a structural job that requires engineering and permits. Bench footing is a lower-cost alternative that adds height without going as deep. We advise which fits your foundation and budget.
How do you prevent basement flooding and moisture?
We address moisture before finishing — interior or exterior waterproofing as the situation calls for, a sump pump where needed, and a backwater valve to protect against sewer backup. Finishing a basement without solving moisture first is the most common cause of damaged drywall and mould down the road.
How long does a basement renovation take?
Finishing an existing basement typically takes about 4 to 8 weeks. Adding a legal suite, a walkout, or underpinning extends that timeline because of the additional structural work, permits, and inspections. We give you a realistic schedule at the quote stage.
How do I find a basement renovation contractor near me?
We renovate basements across Toronto, Mississauga, Vaughan, Brampton, Markham, Richmond Hill, and the surrounding GTA. If you are searching for a basement renovation contractor near you, send us your address and a short description of the basement (current condition, ceiling height, whether you want a legal suite or a finished family room) and we will confirm whether the project fits our service area and schedule a site visit.
Ready to get started?
Tell us about your project and we'll put together a clear scope and quote.