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 an Official Plan Amendment (Law 0473) and a Zoning By-law Amendment, By-law 474-2023 (Law 0474), both amending 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, 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. A citywide expansion of the six-unit cap is still under study; it is not yet a citywide rule, so a buyer looking outside the Toronto and East York District or Ward 23 should still plan around the four-unit as-of-right ceiling.

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, and additions to a single-family dwelling run $18.56 per square metre.

Permit fee type	Rate (effective Jan 1, 2026, reconfirm at filing)
New residential unit, per unit	$56.33
Interior alterations	$11.53/m²
Addition to a single-family dwelling	$18.56/m²

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. The first unit remains chargeable unless it separately qualifies for an exemption under provincial additional-dwelling-unit legislation, so a straight house-to-duplex conversion isn't automatically free of development charges on unit one.

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.

	1 to 2 units, owner-occupied	3 to 4 units, owner-occupied
Minimum down payment	5% of the first $500,000, plus 10% of the amount between $500,000 and $1,500,000	10% of the full purchase price
Maximum loan-to-value	95%	90%
Maximum insured price	$1,500,000	$1,500,000
Standard amortization	25 years (30 years via CMHC Home Start for eligible buyers)	25 years (30 years via CMHC Home Start for eligible buyers)

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. Triplex and fourplex owner-occupied properties don't have the same clean, published 100% rule. Treatment of rental income on three- and four-unit buildings is more conservative and varies by lender, so a buyer should confirm the specific offset their lender will apply before assuming a fourplex qualifies 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. Using Toronto's Q1 2026 average asking rents (one-bedroom around $2,246/month, two-bedroom around $2,939/month, both moving figures that should be checked against current listings before relying on them), two one-bedroom units and one two-bedroom unit bring in roughly $7,431/month in gross rent.

That's about $691 more a month than the 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 still has to fund them out of that surplus or out of pocket. The headline result still holds: tenants in three units are servicing essentially the entire mortgage, and the owner's real housing cost is whatever's left after 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 (owner-occupied 1-4 unit)	Buying a pure rental property
Minimum down payment	5% to 10% depending on unit count, CMHC-insured	Conventional financing; CMHC's owner-occupied insurance doesn't apply
Insured price cap	$1,500,000	Not applicable to CMHC homeowner insurance
Rental income counted toward qualifying	Up to 100% of secondary unit's gross rent on a 2-unit property, within 39% GDS / 44% TDS caps	Lender-specific rental-offset policy for investment financing
Amortization	25 years standard, 30 years via CMHC Home Start	Lender-specific
Principal residence exemption	Partial: applies to the owner's unit, generally not to the rented portion	Not applicable; the whole building is a taxable rental asset

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 every lender treats rental income the same way. The clean, published 100% rent-offset rule applies only to two-unit owner-occupied properties. Assume the same treatment on a triplex or fourplex without confirming it with the specific lender, and the qualifying income, and the maximum purchase price, can land smaller than planned.
• Ignoring the development-charge and tax exposure on conversion. The first unit in a conversion project can still be chargeable even though units two through six are exempt, and 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 financing against CMHC's owner-occupied insured mortgage pathway, 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.