What It Costs to Build a Fourplex in Toronto in 2026
The honest answer is “it depends”, but here are the real cost drivers, the rough ranges we see, and the 2026 incentives that quietly lower your net cost.
It’s the first question almost every owner asks us: what does it actually cost to build a fourplex in Toronto? The honest answer is that it depends on your property, your design, and your finishes, but “it depends” isn’t useful when you’re trying to decide whether to proceed. So here’s how the number actually comes together.
The big cost drivers
Two builds with the same unit count can land a long way apart. The variables that move the number most:
- New build vs. conversion, a clean teardown-and-rebuild prices differently than working around an existing structure.
- Foundation and soil, what’s underground is the single largest swing in most budgets.
- Unit count and a rear “+1”, adding a garden or Alternate Dwelling Unit adds cost, but usually adds more value.
- Finishes, rental-grade durable versus near-condo finish is a real line-item choice.
- Servicing, an upgraded water, sewer, or 400-amp electrical connection can add tens of thousands.
The land sets the ceiling; the foundation sets the surprises. Everything else is a choice you control.
What the 2026 incentives do to your net cost
This is the part most cost conversations miss. Toronto and the senior governments have stacked incentives that materially lower the net cost of a purpose-built rental multiplex:
- Development charges are waived on the first six units, on a project that would otherwise pay roughly $40,000–$55,000 per unit, that is a saving in the order of $160,000–$270,000.
- HST is effectively removed on qualifying new purpose-built rental, through a 100% federal rebate matched by Ontario.
- CMHC MLI Select financing can support up to ~95% of cost and 40–50 year amortizations for projects that hit its points.
None of these are automatic, they depend on staying inside the rules and designing for them from day one, but together they change the math enough that “too expensive” is often wrong.
Get a real number for your property
We’ll build you an honest, itemised estimate from your actual address and goals, including which incentives your project can capture. Send us the details or grab The Reside Guide first to see how the pieces fit together.