East Toronto Secondary Suites and Multiplexes: What's Legal, What It Costs, and What It Actually Pays in 2026
Toronto's rental rules changed under most investors before they noticed. Multiplex zoning, basement suite requirements, and what you can legally add to a lot in East Toronto look nothing like they did even two years ago, and most of what changed works in your favor.
The East Toronto Investor's Guide compared what five neighbourhoods return side by side. This one goes underneath that comparison: the zoning, the permits, and the actual math behind adding a legal rental unit to a property you already own or are about to buy.
None of this is abstract. East Toronto's rental market has been tightening for two years running, and the properties working hardest for an investor right now are often the ones where an extra legal unit is the difference between a mortgage that's a stretch and one that isn't.
What's Actually Legal Right Now
Two separate frameworks govern how many units you can legally add to one East Toronto lot, and they stack rather than duplicate each other.
The first is Toronto's own multiplex by-law. Since May 2023, up to four units are allowed as-of-right on any residential lot in the city: no rezoning application, no public meeting, just a building permit. In June 2025, that cap rose to six units across Toronto & East York District and Ward 23, the area running from Roncesvalles to the Beaches. Leslieville, Riverdale, East York, and The Beaches all sit inside that boundary, along with Cabbagetown and Parkdale.
If you're evaluating a property, "as-of-right" is the key phrase: it means the zoning already allows the extra units without a variance application or a committee hearing. The only gate left is the building permit and the code requirements below it, a very different process than the rezoning fights that used to make multiplex conversions a gamble.
The second is the garden suite framework, which covers a separate, detached structure in the rear yard. It's allowed city-wide, and it stacks on top of the multiplex allowance rather than competing with it.
Put the two together and a typical East Toronto lot in Ward 23 can legally hold up to seven units: six inside the main building, plus one garden suite behind it. That's well beyond Ontario's provincial floor under Bill 23, which guarantees a smaller baseline of three units: the main house, one interior secondary suite, and one detached unit. Toronto's own zoning goes considerably further than the province requires.
Development charges are waived on the first six units citywide, and there's no minimum parking requirement attached to any of it. Push past six units into a seventh with a garden suite, though, and that specific unit can lose its own waiver, so confirm the current rule with the city before counting on it in your numbers.
What Legalizing a Suite Requires
None of this happens automatically just because the zoning allows it. A legal secondary suite needs its own private entrance, its own kitchen, its own bathroom, and a defined sleeping area, and every one of those has to be inspected and signed off, not assumed.
The permit comes first. Toronto requires a building permit before any work starts, and that applies just as much to a suite that's existed unregistered for years as it does to new construction: there's no grandfathering for units that were never legalized. Once construction passes final inspection, the suite gets registered with the city, and that registration is what actually makes it recognized for insurance, property tax, and rental purposes.
Registration isn't just a formality. It's what lets a lender count the suite's rental income toward mortgage qualification, and what lets an appraiser value the property as a legal multi-unit rather than a single-family home with an extra room in the basement.
New Ontario Building Code requirements took effect at the end of March 2026: a minimum basement design temperature of 18°C, full-height insulation, and radon protection are now part of what a suite has to meet, on top of the existing entrance, kitchen, and bathroom requirements.
Budget four to seven months from permit to occupancy. That's a typical range, not a guarantee: older homes with more to correct tend to land at the longer end.
What It Actually Costs
Legalizing a basement suite in Toronto typically runs $80,000 to $160,000 for a 700 to 1,000 square foot unit, before any structural work to raise ceiling height. If the basement needs underpinning to meet code headroom, add another $40,000 to $80,000 on top of that. Per square foot, that works out to roughly $120 to $200 across the project.
A separate entrance alone typically runs $10,000 to $30,000 depending on where it goes and what it has to cut through. East Toronto's housing stock skews older than a lot of the city, and homes with knob-and-tube wiring, galvanized plumbing, or moisture issues in the foundation can add another $8,000 to $25,000 before the suite itself is even framed.
None of these figures include the unit's own finishes: flooring, cabinetry, appliances. Get quotes from at least two licensed contractors before committing, since the spread between bids on secondary suite work in this city tends to be wide.
These are Toronto-wide figures, not East Toronto-specific ones, and every property is its own case. The honest way to use them: as a planning range to get a contractor quote against, not a number to build a purchase offer around.
What You Actually Keep
The number that actually matters isn't the rent a suite brings in. It's what's left after everything that comes off the top.
Take a Leslieville basement suite as a working example. Legalizing it runs somewhere in that $80,000 to $160,000 range from the section above. Based on current listings, a one-bedroom legal basement unit in Leslieville and Riverdale rents in the neighbourhood of $1,600 a month, plus utilities. That's what's actually on the market right now, not a survey average, so treat it as a starting point rather than a guarantee. Of that roughly $21,600 a year, ordinary landlord insurance, maintenance, and vacancy typically eat 15% to 20% before it's really yours, landing net income closer to $17,000 to $18,000 a year on the suite alone.
Set against a $100,000 legalization cost, that's a rough payback window worth running your own numbers against rather than taking as a promise. A 5% cap rate is a reasonable general starting point for a small multiplex property in today's market, and it's worth saying plainly: Toronto's purchase prices have climbed faster than rents for years now, so yields here sit lower than a lot of the country. That's the market, not a flaw in the math.
One more number worth leaning on: East Toronto's rental vacancy rate sat at 2.6% in 2025, down from 2.9% the year before. It's a regional figure, not a neighbourhood-by-neighbourhood one, but it points the same direction as everything above. Tenants are harder to lose than they are to find right now, and that tightness is exactly the environment a legal suite is built to take advantage of.
The Cost of Skipping It
An unregistered basement apartment isn't just an administrative gap. It's a real liability sitting on the property.
The city can issue a work order requiring an illegal unit to be brought up to code or removed entirely, and fines start at $1,000 and can climb as high as $50,000 per violation. A tenant living in an unregistered unit can be subject to an eviction order tied to that same non-compliance. On the insurance side, a claim on a property with an unregistered suite can be denied outright, which turns a routine repair into an uninsured loss at the worst possible moment.
It also shows up at resale. A buyer's lawyer or lender who spots an unregistered suite during due diligence can hold up closing entirely until it's addressed. That's exactly the kind of delay a motivated seller can't afford.
None of that is a reason to panic if you're buying a property with an existing unregistered suite. It's a reason to price the legalization cost into your offer rather than discover it after closing.
Where This Pencils Out
The zoning and the rent data above apply differently depending on which East Toronto neighbourhood the property sits in.
Leslieville and Riverdale are where the rent figures above actually come from, so the suite math in this piece maps most directly onto either one. East York sits inside the same Toronto & East York District that got the June 2025 expansion to six units, which makes the higher end of the multiplex framework worth a closer look there specifically. The Beaches's larger lots tend to suit a garden suite better than a full multiplex conversion, and Danforth/Greektown's density and transit access make it one of the stronger candidates for a full multiplex conversion in this comparison.
Each neighbourhood's full price and rent picture lives in its own guide, linked above. This piece is the layer underneath all five: the rules that decide what you're actually allowed to build before any of those neighbourhood numbers come into play.
Frequently Asked Questions
Is a basement apartment legal in Toronto?
Yes, as-of-right in virtually every residential zone, provided it has its own entrance, kitchen, bathroom, and sleeping area, passes a building permit and inspection, and gets registered with the city afterward. An existing unregistered unit doesn't qualify automatically. It has to go through the same process.
How much does it cost to legalize a secondary suite in Toronto?
Typically $80,000 to $160,000 for a 700 to 1,000 square foot unit, more if the basement needs underpinning for ceiling height. Costs vary by property, especially in East Toronto's older housing stock, so treat any figure as a planning range rather than a fixed number.
How many units can I have on one property in East Toronto?
Up to six in the main building under Toronto's multiplex by-law, plus one garden suite in the rear yard, for seven units total on a typical Ward 23 lot. That's well beyond the province's three-unit Bill 23 floor, though the garden suite is the unit most likely to need its own permit and development-charge check.
What can I rent a basement suite for in East Toronto?
Based on current listings, not a formal market survey, a one-bedroom legal basement suite in Leslieville and Riverdale runs around $1,600 a month plus utilities. Rents vary by neighbourhood, unit condition, and finish level, so use this figure as a starting point for your own numbers rather than a guarantee.
Is it worth legalizing an existing illegal basement apartment?
Usually, yes. Beyond the fines and possible eviction orders tied to an unregistered unit, an uninsured claim on a non-compliant suite can turn a small repair into a five- or six-figure loss. Legalization cost is real, but so is the risk it removes.
What This Means for You
Everything above is about what you can legally add to a property. There's a separate question worth asking before you even get that far: which properties are priced like the extra unit doesn't already work in your favor.
That's exactly the gap the Expired Listing Rescue Kit is built to find. An expired listing didn't sell the first time around. Usually that's a pricing or timing problem, not a property problem, which means it's sitting there for anyone willing to look past why it didn't move. Free to download, no strings attached.
Want to walk through the numbers on a specific property first, secondary suite or not? Book a free consult and bring your questions.
