Across the GTA, I keep getting the same question from homeowners right now: Should I convert my basement into a rental suite?
It makes sense that people are asking. Toronto housing costs are still steep, mortgage carrying costs have not eased as fast as people hoped, and the city has been making noise about densification and missing middle housing for a few years now. At the same time, a lot of homeowners have a finished or semi-finished basement sitting mostly unused. The math looks attractive on paper.
But the actual answer is more complicated than “yes, do it.” I have walked through this process with a lot of clients over the past few years and the decisions that come up are real ones. This post is my attempt to lay it out plainly.
What Does a Legal Secondary Suite Actually Require in Toronto?
This is where a lot of homeowners get tripped up. A secondary suite in Toronto has to meet the Ontario Building Code and Toronto’s own zoning bylaw requirements. That means things like:
- Minimum ceiling height (generally 1.95 m / 6 ft 5 in for habitable space, though older exemptions exist in some areas)
- Separate entrance - either an existing side or rear entrance, or one you need to create
- Proper egress windows in sleeping rooms (these are larger than most people expect - minimum 0.35 sq m clear opening, no dimension under 380 mm)
- Fire separation between the suite and the rest of the house (typically 30 or 60 minute fire rating depending on configuration)
- Dedicated electrical panel or subpanel
- Smoke and carbon monoxide detectors meeting current code
- Ventilation and heating for the unit
- Separate bathroom and kitchen
Getting a building permit is not optional if you want this done legally and if you ever want to sell the home without headaches. We have seen deals fall through over unpermitted basement suites - the buyer’s lawyer finds it, the insurance gets complicated, and suddenly you are dealing with a serious discount on your asking price or a condition to remediate. A legal suite adds value. An unpermitted one is a liability.
What Does It Cost in 2026?
Rough numbers for a Toronto basement secondary suite conversion, assuming a semi-finished space:
- Basic legal conversion (existing layout works, mainly permits, egress windows, fire separation, electrical): $40,000 - $65,000
- Mid-range with some reconfiguration (moving walls, adding a separate entrance, full kitchen and bath fit-out): $65,000 - $110,000
- Full build-out (low ceiling that needs underpinning, major structural work, full fit-out): $110,000 - $200,000+
These numbers include permit fees, which in Toronto can run $1,500 - $4,000+ for this scope depending on what triggers are hit. Labour costs are elevated this year - GTA crews are busy and the good ones are booking out 4-8 weeks.
Does the Math Work?
That depends entirely on what you can rent the suite for and what your carrying cost is. A legal two-bedroom basement suite in a decent Toronto neighbourhood is renting for anywhere from $1,800 to $2,600 per month right now depending on location, finishes, and whether parking or laundry is included.
If you spend $80,000 on the conversion and rent it at $2,000 per month, you are looking at a roughly 40-month payback on the build cost alone, not counting tax implications, maintenance, and the landlord obligations that come with the Residential Tenancies Act. That is not a bad return in a city where other investments are uncertain - but it is not a get-rich-quick play either.
Worth mentioning: the City of Toronto has programs that can offset some costs if you are renting to lower-income tenants. The Basement Suite Renovation Program and the Multi-Unit Residential Acquisition program have had limited funding windows. Worth checking if either is open when you are planning.
What to Think About Before You Commit
A few things I always ask clients to sit with before we start:
Do you want to be a landlord? Ontario’s Residential Tenancies Act is tenant-protective. Eviction is not simple. If you have a problem tenant, resolution can take months through the Landlord and Tenant Board. This is a real operational consideration, not a theoretical one.
Does your basement actually support it? Low ceilings that require underpinning change the economics dramatically. Get a contractor through the space before you commit to numbers.
What is your timeline? If you plan to sell in 2-3 years, a fully permitted legal suite almost certainly adds value. If you are planning to sell in 6-12 months, the payback math changes.
We work on secondary suites across the GTA - everything from simple egress window installs and fire separation upgrades to full underpinning and build-outs. If you have questions about what your specific basement would need, or want a realistic read on whether the conversion makes sense for your situation, drop it below or check out the LF Builders renovation overview for more on what we do.
Also worth a read: Most Commonly Asked Questions - the community FAQ covers a lot of the permit and contractor-vetting basics.
What is pushing you toward or away from a secondary suite right now? Happy to dig into specifics.