Start Here | How It Works

How a Toronto Fourplex Actually Gets Built

The headline change in Toronto is simple: since the multiplex by-law of May 2023, up to four units are a permitted use on residential lots across the city. That means no rezoning, no Official Plan amendment, and no public meeting for a compliant build — you go to a building permit. Here is the path, and the gates that decide whether your lot qualifies.

Key Takeaways

✓Up to four units as-of-right in residential Neighbourhoods zones, city-wide.
✓No rezoning, no public meeting for a compliant multiplex — it is a building-permit process.
✓Six units only in the nine sixplex wards (or a ward that opts in).
✓A design that exceeds the envelope needs a Committee of Adjustment minor variance.

The Four Steps

Step 1

Confirm the lot is in a residential Neighbourhoods zone

The multiplex permissions apply to residential zones (RD, RS, RT, RM) on lands the Official Plan designates Neighbourhoods. That covers most of Toronto's residential lots. This is a lookup, not an application.

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Step 2

Decide the form — up to four units, or six in a qualifying ward

Four units are permitted as-of-right anywhere. Six units are permitted only in the nine sixplex wards, or in a ward whose councillor has opted in. Your ward sets the ceiling.

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Step 3

Fit the design to the as-of-right envelope

Height, lot coverage, and setbacks still apply. A design that stays inside them goes straight to a building permit. A design that exceeds them needs a Committee of Adjustment minor variance first.

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Step 4

Apply for a building permit

Because the use is permitted, there is no rezoning, no Official Plan amendment, and no public meeting for a compliant multiplex. You apply for a building permit and build.

Best For

✓ Residential Neighbourhoods lots where a fourplex fits the as-of-right envelope.
✓ Lots in one of the nine sixplex wards aiming for five or six units.
✓ Owners who want to skip rezoning and the public meeting entirely.

Usually Fails When

✕ A sixplex is assumed on a lot outside the nine wards (and the ward has not opted in).
✕ The design exceeds height, coverage, or setbacks and the variance timeline was not planned.
✕ A heritage conservation district adds review that was not scoped.

What To Verify Before Spending Money

→ The residential zone and Neighbourhoods designation for the parcel.
→ Which ward the lot is in, and its sixplex status.
→ Whether the design fits the as-of-right envelope or needs a variance.

Where to Go Next

Is Your Lot Eligible?

Zone, designation, and which ward you're in.

The Multiplex By-law

What the 2023 fourplex by-law actually says.

Committee of Adjustment

When a minor variance comes into play.

Frequently Asked Questions

How does building a multiplex in Toronto actually work? +

For a compliant project, it is a building-permit process, not a rezoning. Since the May 2023 multiplex by-law, up to four units are permitted as-of-right in residential Neighbourhoods zones across Toronto. You confirm the zone, design within the as-of-right envelope (height, coverage, setbacks), and apply for a building permit — no Official Plan amendment and no public meeting. A design that exceeds the envelope needs a minor variance from the Committee of Adjustment.

Do I need a rezoning or a public meeting for a fourplex? +

No. The 2023 multiplex by-law made up to four units a permitted use city-wide in residential Neighbourhoods zones. Because the use is permitted, there is no rezoning, no Official Plan amendment, and no public meeting for a compliant fourplex. That removed the single biggest source of delay and uncertainty.

What is the difference between a fourplex and a sixplex here? +

A fourplex (up to four units) is permitted everywhere in a residential Neighbourhoods zone. A sixplex (five or six units) is permitted as-of-right only in nine wards, with an opt-in path for the rest. So the process is the same; the unit ceiling depends on your ward.

What pushes a project out of the building-permit stream? +

Two things mainly: a design that exceeds the as-of-right envelope (needing a Committee of Adjustment minor variance), and heritage designation (a conservation district or listed property can add review). Neither is a rezoning, but both add time you should plan for.

Where does the provincial Bill 23 fit in? +

Bill 23 set a three-unit as-of-right floor across Ontario and removed development charges on the second and third units. Toronto built on that floor, going to four units city-wide. So the provincial law is the backstop; Toronto's own by-law is what a city builder works from day to day.