House Hacking in Toronto: Live in a Multiplex, Rent Out the Rest

House hacking in Toronto means buying a legal duplex, triplex, or fourplex, moving into one unit, and renting the others so their rent covers most or all of the mortgage. It works for two reasons. Toronto now permits two-to-four-unit buildings as-of-right in most residential zones, and CMHC's owner-occupied insured mortgage rules ask for a smaller down payment while counting much of the rental income toward qualifying income, terms an investor buying the same building purely as a rental doesn't get. Done on a legal building, with every unit properly permitted and closed off, it can cut an owner's real monthly housing cost by half or more. Done on a building with unpermitted units, it can leave a buyer holding income the city and the lender won't recognize.

What Counts as House Hacking in a Toronto Multiplex?

The mechanics are simple: buy a building with two to four legal dwelling units, occupy one of them as your home, and rent the rest at market. The rent from the other units gets applied against the mortgage, taxes, and insurance on the whole building, so the owner's actual out-of-pocket housing cost is the gap between what they pay and what the other units bring in, not the full carrying cost of the property.

What makes this different from simply owning a rental property is the occupancy requirement. Lenders, insurers, and the city all treat an owner-occupied multiplex differently from a pure investment building, and those differences are where the financial upside of house hacking actually comes from.

Which Properties Actually Qualify?

Not every multi-unit building in Toronto is legal, and not every legal building is stacked correctly for house hacking. A few rules define what qualifies.

Toronto permits duplexes, triplexes, and fourplexes (two to four units) as-of-right in most residential zones citywide. City Council adopted this change on May 10, 2023 through Official Plan Amendment 649 (By-law 473-2023) and Zoning By-law Amendment 474-2023, which amends Zoning By-law 569-2013. As-of-right means no rezoning application and no committee hearing: if the property is zoned residential, a two-to-four-unit building is generally a permitted use outright.

There's a configuration rule buyers miss: to qualify as a duplex, triplex, or fourplex under Toronto's multiplex zoning, at least one unit has to sit entirely or partially above another. Side-by-side units, the classic semi-detached-with-a-basement-suite layout, are regulated as townhouses or semi-detached dwellings under different standards, not as multiplexes. That distinction affects setbacks, parking, and how many units the lot can carry.

No minimum parking is required for a Toronto multiplex; an owner can add parking voluntarily if it meets standard zoning requirements, but nothing forces it. Setbacks generally match whatever other residential building types are permitted in that zone, and height is commonly capped near 10 metres (32'-10"), or the applicable Height Overlay where one exists, though the exact number varies by zone and should be confirmed for a specific address through a Zoning Review before relying on it.

Beyond the citywide two-to-four-unit rule, City Council adopted further amendments on June 25 and 26, 2025, allowing up to six units per multiplex building in the Toronto and East York District and in Ward 23 (Scarborough North), through By-laws 648, 653, and 654. Those by-laws are now in force in those two areas specifically. Council did not extend the six-unit cap citywide. Outside those areas, a houseplex on an ordinary residential lot stops at four units, though five or more units can still be as-of-right on RM-zoned lots without a low unit limit and on lots abutting a major street.

Converting an existing house into a legal duplex, triplex, fourplex, fiveplex, or sixplex takes a single Building Permit application. The work has to meet Ontario Building Code requirements: fire separation between units, proper egress (stairs, landings, guards, and handrails), and documented smoke and carbon monoxide alarms. None of that is optional, and none of it is inferred: it's inspected.

That inspection matters more than most buyers realize. A unit only becomes legal in the city's eyes once the building permit for its creation is closed, which requires the owner to schedule and pass a final inspection. A permit that's open but never closed can block a future sale or complicate new permit applications on the property, a fact that surfaces most painfully during a buyer's own due diligence on someone else's "already-converted" building.

Fees are modest relative to the project. On the current Toronto Building fee schedule, effective January 1, 2026 and indexed annually, a new residential unit created through a permit costs $56.33 per unit, interior alterations run $11.53 per square metre ($1.07 per sq ft), and additions to a single-family dwelling run $18.56 per square metre ($1.72 per sq ft).

One more cost line worth knowing before converting a house: as of July 24, 2025, a City of Toronto by-law exempts the second through sixth dwelling unit in a development of up to six units from municipal development charges. Converting an existing house does not charge the existing home, because it is not a new unit; only the units added can attract a charge, and units two to six are exempt. On a knock-down and rebuild, the first unit pays, less a credit when the new building replaces a legal home demolished within the five years before the permit application.

How Does Financing Work for an Owner-Occupier?

This is where house hacking earns its name. CMHC's homeowner Purchase insured mortgage program covers properties with one to four units, provided at least one unit is occupied by the borrower (or by a related person living there rent-free). That single condition, owner-occupancy, unlocks financing terms an investor buying the identical building as a straight rental cannot get.

The $1.5 million ceiling on insured purchases was raised from $1 million effective December 15, 2024, which pulled a meaningful slice of Toronto's multiplex stock into insured-financing range that previously required a conventional, higher-down-payment mortgage.

Rental income is the other half of the equation. For an owner-occupied two-unit property, CMHC allows up to 100% of the secondary unit's gross rental income to be added to the borrower's qualifying income, subject to CMHC's debt-service caps: 39% gross debt service (GDS) and 44% total debt service (TDS). That's a materially different qualification math than buying the building as a pure rental, where the lender's own rental-offset policy applies instead. For an owner-occupied triplex or fourplex, CMHC's published rule is less generous: the lender can add up to 50% of the gross rent to your income, or use the net rental income approach instead, so a fourplex does not qualify the same way a duplex does.

What Does the Cash Flow Actually Look Like?

Here's an approximate, illustrative worked example built the way TESA underwrites these deals: a legal, permit-closed fourplex in Toronto, purchase price $1,248,000.

At the 3-4 unit owner-occupied minimum, the down payment is 10% of the full price: $124,800, leaving an insured mortgage of $1,123,200 at 90% loan-to-value, the maximum CMHC allows for a 3-4 unit property. CMHC's mortgage insurance premium is added to the loan amount and rises with LTV; at exactly 90% LTV it lands in CMHC's mid-tier of roughly 3.10% (illustrative; confirm the current premium schedule before underwriting a real deal), which adds about $34,800 to the insured loan, for a total insured mortgage near $1,158,000.

On a 25-year amortization at an illustrative 5% fixed rate, compounded semi-annually as Canadian mortgages are, that works out to a monthly payment of roughly $6,740.

The owner occupies one two-bedroom unit and rents the other three. At CMHC's October 2025 averages for purpose-built rentals in the Toronto area ($1,761 a month for a one-bedroom and $2,045 for a two-bedroom), two one-bedroom units and one two-bedroom unit bring in about $5,567 a month in gross rent. CMHC's averages include long-held units at older rents, so a newly leased unit in a legal fourplex can rent higher; check current rents on the street before relying on any figure.

That's about $1,173 short of the $6,740 mortgage payment, before property tax, insurance, utilities, and a maintenance reserve. None of those costs are fixed enough citywide to state as a single figure, and the owner funds them, plus the shortfall, out of pocket. The tenants in three units still cover most of the mortgage, about 83% of it at these averages, so the owner's real housing cost is the shortfall plus taxes, insurance, and upkeep, not $6,740 a month.

What Happens to Your Principal Residence Exemption?

The tax trade-off is the part house hackers underestimate. Renting out a structurally separate unit, one with its own entrance, kitchen, and bathroom, which is exactly what a legal multiplex unit requires, is generally treated by the CRA as a partial change in use of the property. The capital gain attributable to the rented portion is calculated by room count or square footage and becomes exposed to capital gains tax on sale, though it can potentially be deferred through a subsection 45(2) election.

The CRA does have an "ancillary use" exception that avoids a deemed disposition entirely when part of a home is rented, but it generally requires no structural separation, no added entrance or kitchen, and no capital cost allowance (CCA) claimed on the building. A legal multiplex unit fails that test by definition: the city won't recognize it as a legal unit unless it has its own entrance, kitchen, and bathroom, which is precisely the structural separation the ancillary-use exception rules out. Claiming CCA on the rented unit to shelter rental income also rescinds the option to defer the gain under the 45(2) election. In practice, a house hacker should expect the rented portion of the building to carry capital gains exposure on sale, and should get that allocation, and the CCA decision, right before filing rather than after.

When Does House Hacking Beat Renting or Buying a Pure Rental Property?

Laid out as a decision, not a story:

House hacking beats renting for a buyer who can occupy one unit of a legal multiplex and wants the other units' rent doing real work against the mortgage instead of paying a landlord's mortgage for them. It beats buying a pure investment property for a buyer who is comfortable living on-site and wants the lower down payment and rental-income qualification that owner-occupancy unlocks. It loses to both when the buyer can't tolerate living beside tenants, when the building's units aren't legal, or when the numbers only work at a rent level the market won't actually pay.

What Mistakes Break the Numbers?

The recurring ones:

• Buying a building with unpermitted or non-conforming units. A basement unit that was never permitted, or a permit that was never closed with a final inspection, isn't legal income in the lender's eyes or the city's. An open permit can also block the sale itself.
• Undersizing the owner's own unit. House hacking only works long-term if the owner can actually live in the space they've kept, and a unit split to maximize rentable square footage at the expense of the owner's own layout tends to get sold or vacated within a few years, resetting the whole tax and financing picture.
• Assuming a fourplex qualifies like a duplex. CMHC's 100% rent rule applies only to a two-unit owner-occupied property. On a triplex or fourplex the lender adds up to 50% of the gross rent, or uses net rental income, so the qualifying income, and the maximum purchase price, land smaller than on a duplex.
• Ignoring the development-charge and tax exposure. On a conversion, the added units (units two to six) pay no City development charge and the existing home is not charged as a new unit; on a knock-down and rebuild, the first unit pays, less a credit when the new building replaces a legal home demolished within the five years before the permit application. The rented units' capital gains exposure needs to be planned for at purchase, not discovered at sale.

How TESA Underwrites a House-Hack-Ready Multiplex

We run this as one file, not three separate transactions. TESA Real Estate underwrites the acquisition against the occupied unit's carrying cost and the market rent the other units can actually command, not a pro forma rent. TESA Development confirms the units in question are legally created, meaning the permits are closed and the final inspections have passed, before we advise a buyer to treat that rent as bankable income. TESA Capital structures the capital behind the purchase alongside licensed lenders, working within CMHC's owner-occupied insured mortgage rules, including the down payment tier, price cap, and rent-offset rules that apply to the specific unit count in play. The point of carrying all three is that a buyer gets one consistent answer on what the building is worth to live in, not a zoning answer from one advisor and a financing answer from another that don't agree.