What It Actually Costs to Build a Fourplex in Toronto

A new-build fourplex in Toronto runs roughly $600,000 to $1.2 million or more in total project cost, land-ready lot to occupancy permit, with hard construction costs landing somewhere between $250 and $400 per square foot depending on finish level and site conditions. Those are industry benchmarks, not an official index: no single Canadian cost authority publishes a fourplex-specific figure, so the number that matters most is the one on your contractor's actual quote. This piece breaks the range into its parts: hard costs, soft costs, development charges and financing carry, so you can check that quote against something real. For the fuller framework behind these numbers, see What a Toronto Multiplex Actually Costs to Build.

What Makes Up the Hard Cost Line

Hard cost is the largest single bucket in a fourplex build: site work and foundation, framing and envelope, then mechanical, electrical, plumbing and interior finishes. Industry sources put it at $250 to $400 per square foot of gross floor area in the GTA, all-in. For a fourplex in the 2,500 to 3,500 square foot range, a common size for four-unit infill on a standard Toronto lot, that puts the hard cost bucket at roughly $625,000 to $1.4 million before soft costs or contingency are added.

There's no published, category-by-category breakdown of that figure the way there is for permit fees. Toronto builder guides quote the blended per-square-foot number, not a line-by-line split between excavation, foundation and finishes. Treat the per-square-foot range as your starting point and get your general contractor to itemize the trades against it; that itemized number, not the blended average, is what should drive your budget.

What Soft Costs Toronto Adds on Top

Soft costs are where a Toronto fourplex budget gets specific to the city. Four line items show up on nearly every build:

• Design and drawings. Architects, engineers and consultants are commonly budgeted at 5 to 15% of hard cost, or as a flat $10,000 to $30,000-plus for design and drawings alone on a smaller scope. Those are two different industry rules of thumb for sizing the same bucket, not costs that stack on top of each other.
• Municipal building permit fee. The City of Toronto's own schedule, effective January 1, 2026, charges $18.56 per square metre of gross floor area plus $56.33 for each new residential unit, with a minimum fee of $214.79 per application. For a 2,500 to 3,500 square foot fourplex, that works out to roughly $4,500 to $6,300 in base permit fees. Industry guides quote a broader "permits and fees" bucket of $10,000 to $20,000-plus, which bundles that base fee with related permit applications a builder typically files alongside it.
• Zoning review, and, only where a variance is needed, a Committee of Adjustment application. Budgeted at $600 to $2,000 and $5,000-plus respectively. Since City Council's May 10, 2023 Official Plan and zoning by-law amendments made two-to-four-unit multiplexes permitted as-of-right across Toronto's low-rise residential zones, a compliant fourplex generally skips rezoning and the Committee of Adjustment hearing entirely, provided the design fits within the existing setback, height and coverage rules.
• Legal and survey work, sized to the specific title and lot.

Development charges are the line that changed most recently, and where the industry commentary can run ahead of the city's own wording. Toronto's Development Charges By-law exempts the second through sixth residential unit in a development of up to six units, effective July 24, 2025. In practice, that means units 2 through 4 of a standard fourplex generally carry no municipal DC. That exemption is specific to units 2 through 6, though: it doesn't cover the first unit, and whether a charge is actually payable on unit one depends on statutory exemptions and any demolition or replacement credit that applies to the lot. Confirm the first-unit treatment against the City's current DC schedule before you price a deal.

On June 23, 2026, the City announced $1.5 billion in federal and provincial funding tied to cutting residential development charges by 40 to 60% from 2026 through at least 2029. That reduction applies to residential development charges generally; the City's announcement doesn't specify whether or how it applies to any DC still payable on the first unit of a small multi-unit building like a fourplex, so it isn't something to bake into a proforma until the City confirms it. For units 2 through 4, the figure was already zero under the 2025 exemption, so this program mainly changes the math for larger, seven-plus-unit projects rather than a standard fourplex.

How HST and the Rental Rebate Factor In

Build a fourplex to hold as long-term rental and the units can qualify for the GST/HST New Residential Rental Property Rebate, filed with the CRA using Form GST524 together with Ontario's Form RC7524-ON, provided each unit is rented at fair-market rent to an arm's-length tenant. That rebate applies to duplexes, triplexes and fourplexes alike. It doesn't change the construction budget itself, but it affects the net HST cost of the project and belongs in the proforma alongside the hard and soft cost lines above.

Financing and Carrying Costs During the Build

Financing carry, the interest that accrues on drawn construction funds before the building is occupied and earning rent, is the cost line most sensitive to timeline. As of the Bank of Canada's July 15, 2026 announcement, its target overnight rate has held at 2.25% for six consecutive decisions. Canada's prime rate, the base most construction and variable-rate lending is priced from, sits at 4.45%, unchanged since October 2025. Construction loans are typically quoted as prime plus a spread that varies by lender and project risk; confirm the current spread before pricing carry into your budget.

One financing door that's closed to a standard fourplex: CMHC's MLI Select insured multi-unit product requires a minimum of five rental units. A four-unit build falls one unit short and needs conventional, non-MLI-Select construction and term financing instead. That matters for carry cost because MLI Select's longer amortization and higher loan-to-cost options aren't available to bring the debt load down; a fourplex's financing stack is priced and sized on conventional terms from the start.

A Worked Line-Item Budget: Land-Ready Lot to Occupancy Permit

The table below lays out each line for an illustrative 2,500 to 3,500 square foot fourplex. The ranges come from different industry sources with different size and finish assumptions, so they won't reconcile to a single number; use the per-square-foot hard cost figure as your building block and confirm every line against your own contractor's and consultant's quotes.

Line item	Approximate range	Note
Hard costs (site work through interior finishes)	$625,000 to $1,400,000	2,500 to 3,500 sq ft at $250 to $400/sq ft
Professional services (architect, engineer, consultants)	5 to 15% of hard cost, or $10,000 to $30,000+ flat for design/drawings alone	Two rules of thumb for the same bucket; don't stack them
Municipal building permit fee	roughly $4,500 to $6,300	$18.56/m² GFA + $56.33/unit, $214.79 minimum, effective Jan 1, 2026
Broader "permits and fees" estimate	$10,000 to $20,000+	Bundles the base fee with related permit applications
Zoning review application	$600 to $2,000	Routine step even for as-of-right builds
Committee of Adjustment	$5,000+ if triggered, often $0	Only needed if the design requires a variance
Development charges, units 2 to 4	$0	Exempt since July 24, 2025
Development charges, unit 1	Not covered by the units 2-6 exemption	Confirm payable amount and any credit with the City
Contingency, utilities and landscaping	10 to 20% of total project cost	Applied to the project total, not stacked line by line
Financing carry during construction	Varies with draw schedule and timeline	Priced off prime (4.45% as of July 15, 2026) plus lender spread
Total project cost, land-ready lot to occupancy permit	$600,000 to $1,200,000+	Hard cost alone can exceed this at the high end; reconcile both ranges against your own quote

Where Do Costs Swing Hardest on a Toronto Fourplex?

Four conditions push a build toward the top of these ranges rather than the bottom. Below the surface: soil that needs engineered fill, or a foundation deeper than a standard lot calls for, and water or sewer service upgrades where the existing connection can't carry four units. Above it: laneway or rear-yard access that slows excavation and material handling, and heritage or streetscape conditions that add a design review layer onto the standard permit process. None of these show up as a separate line in the industry benchmarks above; they show up as the hard-cost bucket landing at $400 per square foot instead of $250, or the contingency line running at 20% instead of 10%.

Fourplex vs Triplex vs Sixplex: Where Four Units Stops Being the Efficient Count

A fourplex spreads its fixed costs, the permit application, the professional design fees, the site servicing, over four units instead of two or three. That's part of why architects quoted in the Globe and Mail describe multiplex-scale construction as structurally cheaper per unit than mid-rise or high-rise building. That efficiency curve doesn't run forever, though; it stops wherever the as-of-right unit ceiling stops.

Unit count	As-of-right in Toronto?	Municipal DC treatment
2 to 4 units (duplex, triplex, fourplex)	Yes, citywide since Council's May 10, 2023 amendments	Units 2 to 4 exempt since July 24, 2025
5 to 6 units (sixplex)	Only in the Toronto and East York district and Ward 23, per amendments adopted June 25-26, 2025; the 4-unit cap still applies elsewhere as of mid-2026	Units 5 and 6 exempt under the same up-to-six-unit by-law where that higher count is permitted

Outside Toronto and East York and Ward 23, four units is currently the ceiling you can build as-of-right, so that's where the efficiency-per-fixed-cost curve stops for most of the city's lots. Ontario Regulation 462/24, in force since November 20, 2024, also affects how the province requires municipalities to treat as-of-right duplex and triplex zoning, and Toronto's own planning division has a team monitoring how that interacts with local zoning. The four-to-six-unit boundary is worth rechecking before you lock a unit count into a design.

Contingency: What to Hold Back

Toronto builder guidance sizes contingency, together with utilities and landscaping allowances, at 10 to 20% of total project cost, on top of the professional services line already covered above. That's an industry rule of thumb, not a regulated figure. The conditions in the section above are the common reasons a fourplex build eats into it: unexpected foundation or shoring work once excavation starts, a service upgrade the existing connection can't support, and design changes triggered by a review layer the initial permit application didn't anticipate. Hold the full 20% if your lot carries any of those conditions before you break ground; the 10% end of the range is for a straightforward, serviced, non-heritage lot.

How TESA Prices and Controls Cost on a Fourplex Build

We underwrite the site against these ranges before a shovel moves. TESA Real Estate runs the feasibility and confirms the as-of-right unit count; TESA Development prices the drawings against actual trade quotes rather than a blended per-square-foot average. TESA SKLTN prices the superstructure package as a fixed scope, and TESA Capital structures the construction facility against the draw schedule the build actually needs, priced off the current prime rate rather than a stale one. We file the permit and development charge paperwork ourselves, so the units-2-through-4 exemption, and whatever the first unit actually owes, get applied correctly the first time rather than caught in a reconciliation after occupancy.