VANPLEX

Building Types | Duplex

The Toronto Duplex: Two Units, the Simplest Multiplex

A duplex is two units in one building. It is the entry point to Toronto's multiplex permissions: the May 2023 multiplex by-law permits up to four units as-of-right in residential Neighbourhoods zones, so two units sit well inside that ceiling. A compliant duplex is a building-permit process, and it requires no parking.

Key Takeaways

  • ✓A duplex is two units — well inside the four-unit as-of-right ceiling, city-wide.
  • ✓No parking required for a duplex since February 3, 2022.
  • ✓A compliant duplex is a building permit, not a rezoning.
  • ✓The form least likely to exceed the zoning envelope.

Two Units, Inside the Same Envelope as a House

A duplex does not get a special envelope. It lives inside the same as-of-right rules as any other residential building in the zone — the height overlay, lot coverage, and setbacks. Because two units are easy to fit, a duplex is the form least likely to push a design out of the building-permit stream and into a Committee of Adjustment variance.

That makes a duplex the natural starting point. A conversion that keeps the existing footprint usually fits the envelope cleanly. A side-by-side or stacked new build of two units sits comfortably within the height and coverage the same lot would allow for a single detached house.

No Parking, Since February 2022

Toronto removed most minimum parking requirements at Council in December 2021, in force February 3, 2022. Duplexes, triplexes, and fourplexes require no parking spaces. For a duplex that means you do not have to surrender yard or build a pad to satisfy a minimum — the space stays available for the building, landscaping, or a future rear-yard suite.

Best For

  • ✓ A first multiplex — the simplest two-unit form on a residential Neighbourhoods lot.
  • ✓ Converting an existing house where keeping the footprint fits the as-of-right envelope.
  • ✓ Owners who want a building permit with no rezoning and no public meeting.

Usually Fails When

  • ✕ The conversion adds height or coverage that exceeds the envelope and a variance was not planned.
  • ✕ The lot sits in a Heritage Conservation District that adds review.
  • ✕ Two units leave the project under-built on a lot that could carry three or four.

What To Verify Before Spending Money

  • → The residential zone and Neighbourhoods designation for the parcel.
  • → Whether the design fits the as-of-right envelope or needs a variance.
  • → Whether a third or fourth unit would underwrite better on the same lot.

Where to Go Next

Triplex
Three units, the Bill 23 floor, no parking.
Fourplex
The city-wide as-of-right maximum.
Parking Reform
Why a multiplex needs no parking.

Frequently Asked Questions

Is a duplex permitted as-of-right in Toronto? +
Yes. The May 2023 multiplex by-law permits up to four units as-of-right in residential Neighbourhoods zones across Toronto. A duplex is two units, so it sits well inside that ceiling. A compliant duplex is a building-permit process — no rezoning, no Official Plan amendment, no public meeting.
Do I need parking for a duplex in Toronto? +
No. Since February 3, 2022, duplexes, triplexes, and fourplexes require no parking spaces in Toronto. The minimum parking requirement was removed, so a duplex does not have to provide a parking space to be approved.
What is the difference between a duplex and a triplex? +
Units, not process. A duplex is two units and a triplex is three. Both are permitted as-of-right city-wide and both require no parking. A triplex is the point where Ontario's Bill 23 three-unit floor and Toronto's by-law line up, but the application path is the same for both.
Can I convert an existing house into a duplex? +
A conversion is permitted where the design stays inside the as-of-right zoning — height, lot coverage, and setbacks. A conversion that keeps the existing footprint usually fits the envelope cleanly. A conversion that exceeds the envelope needs a minor variance from the Committee of Adjustment first.
Does a duplex have to fit a special envelope? +
No special envelope. A duplex lives inside the same as-of-right rules as any other residential building in the zone — the height overlay, lot coverage, and setbacks. Because two units are easy to fit, a duplex is the form least likely to push a design out of the building-permit stream.

Official Sources Referenced

City of Toronto — Expanding Housing Options in Neighbourhoods (EHON)
https://www.toronto.ca/city-government/planning-development/planning-studies-initiatives/expanding-housing-options/
City of Toronto — Multiplex Study (2-4 units)
https://www.toronto.ca/city-government/planning-development/planning-studies-initiatives/multiplex-housing/multiplex-study-2-4-units/
City of Toronto — Considerations When Building Multiplexes
https://www.toronto.ca/city-government/planning-development/planning-studies-initiatives/multiplex-housing/considerations-when-building-multiplexes/
City of Toronto — Multiplex By-law (Law 0473, PDF)
https://www.toronto.ca/legdocs/bylaws/2023/law0473.pdf
City of Toronto — Review of Parking Requirements for New Development
https://www.toronto.ca/city-government/planning-development/planning-studies-initiatives/review-of-parking-requirements-for-new-development/

Screen Your Toronto Lot for a Multiplex

Enter any Toronto address to check the residential zone, how many units the multiplex rules allow, and whether your ward permits a sixplex.