How much does a basement renovation cost in Toronto? In 2026, finishing a basement typically costs $25,000 to $65,000, while larger projects — including legal basement apartments — can run $35,000 to $120,000+. The biggest factors are whether you add a bathroom or kitchen, and whether you’re building a legal rental suite. Here’s a practical 2026 price breakdown for Toronto and the GTA.
Call 647-702-8264 or request a free basement renovation quote for pricing based on your actual project.
Average Basement Renovation Cost in Toronto (2026)
Basement finishing in Toronto generally runs $55–$75 per square foot for a basic finish, $70–$100 per square foot for a mid-range space with a bathroom, and $90–$140 per square foot for a legal basement apartment. The wide range reflects how much mechanical, plumbing and code work the project involves.
Basement Cost by Project Type
| Project type | Typical 2026 cost (Toronto) |
|---|---|
| Basic finish (drywall, flooring, lighting) | $20,000 – $35,000 |
| Mid-range finish with a bathroom | $35,000 – $50,000 |
| Legal basement apartment (kitchen, bath, separate entrance) | $50,000 – $80,000+ |
Ranges are general estimates for planning only. The most accurate way to price your project is a site visit and a written quote.
Legal Basement Apartments: Cost & Rental Income
Converting a basement into a legal rental unit requires more work — fire-rated drywall, interconnected smoke alarms, egress windows, a separate entrance, a full kitchen and complete permits. This typically adds 30–50% to the cost, but it can create rental income of roughly $2,300–$2,600 per month in Toronto, which is why many homeowners treat a legal suite as an investment rather than just a renovation.
What Affects Your Basement Renovation Cost
- Bathroom or kitchen: adding plumbing is one of the biggest cost jumps.
- Legal suite requirements: egress windows, fire separation, ceiling height and a separate entrance.
- Waterproofing & moisture control: essential below grade to protect the finished space.
- Ceiling height and underpinning: lowering a floor for height is a major structural add-on.
- Permits & drawings: Toronto permit fees run roughly $1,000–$1,500 for a typical basement, plus $2,000–$5,000 for designer or architectural drawings.
- Finishes: flooring, trim, lighting and built-ins scale with your finish level.
How to Budget for a Basement Renovation
Set aside an extra 10–15% for surprises common below grade — moisture, older wiring or plumbing, and grading or egress requirements. If you’re building a legal apartment, budget for permits and drawings up front, and confirm your basement meets ceiling-height and egress rules before committing.
Get an Accurate Basement Renovation Quote
Oakbuild Construction finishes and renovates basements across Toronto, Etobicoke and the GTA — from basic finishing to legal basement suites built to Ontario code. Send photos, approximate dimensions, your ceiling height and whether you want a bathroom, kitchen or separate entrance for a realistic estimate.
Learn more on our Basement Renovation Toronto and Basement Finishing pages, or request a free quote today.
Call 647-702-8264 or contact Oakbuild Construction.
Basement Renovation Cost FAQ
How much does it cost to finish a basement in Toronto?
A basic basement finish typically runs $20,000–$35,000 in 2026, while adding a bathroom pushes it to $35,000–$50,000, depending on size and finishes.
How much does a legal basement apartment cost?
A full legal basement suite with a kitchen, bathroom and separate entrance generally costs $50,000–$80,000 or more, since it must meet fire, egress and permit requirements.
Do I need a permit to finish a basement?
Yes, in most cases — especially when adding plumbing, bedrooms, egress windows or a separate entrance. A legal apartment always requires permits.
Can a finished basement add rental income?
Yes. A legal basement apartment in Toronto can generate roughly $2,300–$2,600 per month, which often helps offset the renovation cost over time.