How Much Does It Cost to Build a Sixplex in Toronto? (2026 Numbers)
The short answer: roughly $270–310 per square foot on a fixed-price contract with an experienced multiplex builder — about $1.6–1.8 million in construction cost for a typical ~5,900 sq ft six-unit building. If you've been quoted $350–425/sq ft, you were priced as a custom home. That gap — often more than half a million dollars on one building — is the difference between a builder doing their first multiplex and a crew doing their ninth.
Updated August 2026 · MBL Developments
Why the quotes you're getting are wrong
Call three GTA builders about a six-unit infill and you'll hear numbers between $325 and $425 per square foot. Those numbers aren't dishonest — they're custom-home pricing applied to a building the builder hasn't done before. Custom pricing assumes one-off drawings, unfamiliar assemblies, learning on your dime, and a margin that covers surprises.
If it’s your first project, budget the wider $270–310 per square foot planning band — that’s the honest number before you have a signed contract. A repeatable multiplex template changes the math: same structural system every time, same mechanical layout, trades that have run the sequence before, and materials bought across projects. Teams building these on repeat in Toronto tend to land near the low end of that band — and sign fixed-price contracts there, which matters more than the number itself. A fixed price moves cost overrun risk from your pro forma to the builder's margin — to the extent the signed scope allocates it; exclusions, allowances and owner changes stay yours.
The full cost stack — construction is only half the project
The build cost is the number everyone asks about, but a sixplex project carries a complete stack. Illustrative figures for a typical project on a standard Toronto lot:
| Line | Typical range |
|---|---|
| Land (single-family teardown, sixplex ward) | $800k–1.2M+ by pocket |
| Land transfer tax + closing | ~$30–50k |
| Construction (~5,900 sf @ $290–310/sf fixed) | ~$1.7–1.8M |
| Soft costs (design, permits, energy modelling, application) | ~$100k |
| CMHC MLI Select premium + PST | ~$150–190k |
| Financing costs and interim interest | ~$100–125k |
| Contingency (5% of hard costs) | ~$85–90k |
| All-in, excluding land | ~$2.2–2.3M |
Two lines surprise first-timers. The CMHC premium is real cash — the price of admission to high-leverage CMHC-insured financing (up to 95% loan-to-cost, with amortizations that reach 50 years only at the top point tiers), and it's worth every dollar (that program is a topic of its own). And the municipal development charge is zero-rated on units 2-6 in qualifying developments of up to six units (as of August 2026 — confirm per project; the first unit and education development charges still apply), a five-to-six-figure saving that most people still don't know exists.
What actually moves the number
- Repeatability beats everything. The builder's ninth sixplex costs less than their first — pick teams by their multiplex count, not their renovation portfolio.
- A fixed-price contract is worth more than a low estimate. An estimate of $260 that becomes $310 is worse than a contract at $300 that stays $300.
- Design discipline. Full-floor units with minimal corridor space monetize every buildable foot. Complexity — split levels, exotic cladding, one-off assemblies — is where budgets die.
- The teardown helps you. Full demolition means the whole build is new, simple, and predictable. Renovating around an existing structure is where the horror stories live.
- Don't max the envelope reflexively. Zoning may allow ~7,000 sq ft; the right building might be 5,900. Every extra foot costs the same ~$300 but rents flatten as units get bigger. Size the building to the debt, not the zoning.
Frequently asked questions
What's the realistic all-in cost, excluding land? At the efficient end — tight design, repeatable crews, no surprises — construction plus softs plus contingency lands near $2M; add the CMHC premium and interim interest from the table above and the all-in sits around $2.2–2.3M. Budget the ceiling, celebrate the beat.
Is ~$300/sf realistic in 2026, or a lowball? For experienced multiplex crews on repeatable templates it's a defensible fixed-price target, not a hope. Teams doing these on repeat sign fixed-price in the $290–310 range. If your builder can't sign fixed-price near that, they're learning on your project.
What about HST? New purpose-built rentals with 4+ units qualify for the enhanced GST/HST rental rebate — effectively 100% of the HST comes back on a qualifying, properly structured project (construction start before 2031, substantial completion before 2036, held as long-term rental — as of August 2026). Getting the structure right from day one matters; that's its own article.
How long does it take? Design and permits ~4–8 months (much of it can run during a long closing), construction ~12 months, lease-up ~3–6. Call it two years from offer to stabilized building.
We publish what we learn building six-unit rentals in Toronto's as-of-right wards — closed rent data, real costs, the financing mechanics nobody explains.