Toronto's Missing Middle: the home types the City now allows on a house lot

Key takeaways

• A multiplex is one building with two to six homes. The City says four-unit multiplexes are permitted city-wide, and six-unit permissions apply in the Toronto and East York District and Ward 23.
• A garden suite, a laneway suite or a secondary suite adds one home while the main house stays.
• Council adopted laneway suites on July 16, 2019 and garden suites on February 2, 2022. The Major Streets rules came into force on September 11, 2025.
• As-of-right means the zoning already allows the building, so the owner applies for a building permit without a Committee of Adjustment hearing.
• Ontario Regulation 462/24 sets a 45 percent lot coverage and no floor space limit on lots that end up with three homes or fewer.
• The Official Plan's Neighbourhoods designation covers 35.4 percent of Toronto's area, which is why these rules reach so many lots.

What this page covers

What could a Toronto house lot hold today? Ten years ago the answer on most streets was one house, or a house with a basement apartment. Since 2019 the City has changed the rules several times, and each change added a home type with its own name, its own zoning chapter and its own date. This page puts those home types side by side so an owner, a neighbour or a builder can see the whole set at once. Each one will get its own guide in this section, written one at a time, with the by-law sections and the figures in full.

I am Anthony Palleschi, a real estate sales representative with Weiss Realty Ltd., Brokerage. I work with owners who want to know what their lot is worth to a builder and with builders who need sites for these homes. The rules below come from City of Toronto and Ontario pages I read on November 12, 2026. The source list at the end gives the date each page was last changed.

The home types, one sentence each

• A multiplex is a house with two to six homes in one residential building. The City's Multiplex Housing page says an owner may be able to convert an existing house or build a new multiplex.
• A secondary suite is one extra home inside a detached house, semi-detached house or townhouse. The City's permit guide gives a basement apartment as the common example.
• A garden suite is a separate small home in the back yard of a lot that has no public lane. Council adopted the rule on February 2, 2022.
• A laneway suite is the same kind of separate home on a lot that shares a property line with a public lane. Council adopted the rule on July 16, 2019.
• A Major Streets building is a townhouse or a small apartment building on a lot that abuts one of the streets on Map 3 of the Official Plan. The zoning change allows them in all residential zones along those streets.
• A multi-tenant house, often called a rooming house, is a building where four or more rooms are rented to separate people who may share a kitchen or washroom.

The rules side by side

The table gives the rule and the date. The number of homes a given lot can hold is lower on many lots, because each building must still meet the zoning standards for its zone: height, depth, setbacks, lot coverage and landscaping. My multiplex zoning guide for builders explains those standards, and the lot check guide for owners shows how to read the zoning map for your own property.

How the rules arrived, in order

The City's Expanding Housing Options in Neighbourhoods page, modified September 2, 2026, describes the program as an update to the planning rules that allows more types of homes in neighbourhoods that were mostly detached houses. The page lists duplexes, triplexes, fourplexes, sixplexes in the Toronto and East York District and Ward 23, laneway and garden suites, and the Major Streets work. The changes came one at a time:

1. July 16, 2019: Council adopted the Official Plan and zoning amendments that permit laneway suites in the R, RD, RS, RT and RM zones across the city, according to the City's Changing Lanes page.
2. February 2, 2022: Council adopted the Garden Suites amendments. The City's Garden Suites page says the new policies allow garden suites on properties in most residential zones across Toronto.
3. February 3, 2022: from this date, duplexes, triplexes and fourplexes no longer have to provide a parking space, according to the City's page on building multiplexes.
4. May 10, 2023: Council adopted a pledge to achieve or exceed the provincial target of 285,000 new Toronto homes by 2031.
5. March 31, 2024: the new framework for multi-tenant houses took effect, and every operator now needs a licence.
6. June 25 and 26, 2025: Council adopted the amendments that allow up to six units in the Toronto and East York District and Ward 23, plus a Multiplex Monitoring by-law. The City's Multiplex Housing page says these amendments are now in force.
7. September 11, 2025: the Ontario Land Tribunal issued a decision that resolved the appeal of the Major Streets amendments (Official Plan Amendment 727 and By-law 1062-2025), which brought both into force.

Two of my posts cover the areas these rules apply to. The post on Toronto's low-rise neighbourhoods explains the Neighbourhoods designation, and the post on which wards allow sixplexes lists the six-unit areas ward by ward.

What as-of-right means for an owner

The City's Expanding Housing Options page explains the phrase with a garden suite as the example. If a property is eligible to build a garden suite as-of-right, the owner can apply for a building permit without first applying to the Committee of Adjustment or asking for a change to the zoning by-law. The same idea applies to the other home types on this page: where the design fits every zoning standard, the permit application is the next step.

A design that is taller than the zone allows, or sits closer to the lot line than the by-law permits, needs permission for that exception. That permission is a minor variance, decided by the Committee of Adjustment. A lot split is a consent from the same panel. My guide on severance and minor variance at the Committee of Adjustment explains the tests and the 2026 fees, and my post on minor variance versus severance gives the short version for an owner.

One rule cannot be varied at all. The Garden Suites page says the emergency and fire access requirements for a suite come from an Ontario Building Code review by Toronto Building and Toronto Fire and Emergency Services, and are set outside the zoning by-law. A plan that meets every zoning line can still fail that review, so I treat fire access as the first check on any back yard suite.

Ontario's rule for a lot with three homes or fewer

The province has its own rule for small additions, and it applies as well as the City's zoning. Ontario Regulation 299/19, made under the Planning Act and amended by Ontario Regulation 462/24, covers additional residential units. The City's Expanding Housing Options page says the regulation applies where a lot ends up with no more than three homes, counting the new one. A secondary suite in a house with one other home is the usual case. A fourth home in a building, or a laneway suite behind an existing triplex, is outside it, because the result would be more than three homes.

Where the regulation applies, the City's page lists what changes:

• Buildings and structures may cover up to 45 percent of the lot. Where the City's own zoning allows more than 45 percent, the City's number prevails.
• There is no maximum floor space index for the lot, which means no limit on total floor area compared with lot size.
• The minimum lot area for a building with an additional unit is the same as for that building without one. A duplex needs the same lot area as a detached house.

The regulation itself, in the e-Laws consolidation current from November 20, 2024, adds that a building with an additional unit may pass through an angular plane in the by-law, subject to height and setback limits, and must sit at least 4 metres from another building on the parcel that holds a home, unless the City's by-law allows less. On parking, it requires one space for each additional unit, except where the City's by-law requires no space for the main home, in which case none is required for the additional units either.

Rooms for rent: multi-tenant houses

A multi-tenant house holds rented rooms that share a kitchen or washroom. The City's page on the new framework, modified February 5, 2026, says the rules came into effect on March 31, 2024, and that all operators must obtain a licence through an online application system. The framework is being brought in over three years, and the City says preserving tenancies and preventing evictions is central to how it is applied. The zoning rules that set how many rooms a house may hold are separate from the licence, so an owner who wants to rent rooms should check the zone and the licence rules together before counting on a number.

Why the City changed the rules

The Expanding Housing Options page describes the program as a way to expand opportunities for missing middle housing, from duplexes to low-rise walk-up apartments, to meet the needs of a growing city. Its graphic of Official Plan land use shows the Neighbourhoods designation covering 35.4 percent of Toronto's area and Apartment Neighbourhoods 3.5 percent. Because so much of the city sits in Neighbourhoods, a rule that applies there reaches most house lots at once.

On May 10, 2023, Toronto City Council adopted a pledge to achieve or exceed the provincial housing target of 285,000 new Toronto homes by 2031. The City's own planning work counts suites, multiplexes and Major Streets projects as ways to contribute to that target.

The same lot, through two buyers' eyes

A family buyer prices the house: the kitchen, the bedrooms, the yard, the school nearby. A builder prices the lot: its width, its depth, its zone, whether it touches a lane, and whether the street it faces is on Map 3. On a lot that fits the rules, the builder may count four homes in the main building and a fifth in a garden suite, or six homes in one building in the Toronto and East York District. The two buyers can arrive at two different offers for the same property.

An owner who knows which rules apply to the lot can decide whether to keep the house, add a suite, sell to a family, or sell to a builder. A neighbour who knows the rules can read a proposal on the street and see which parts are as-of-right and which parts need a variance. A builder who knows the rules can test whether a multiplex on the lot pays before making an offer. My post comparing laneway suites, garden suites and multiplexes gives the suite figures from Chapters 150.7 and 150.8, and my post on Missing Middle Housing describes what these buildings mean for a street.

The guides in this section

Each home type above gets its own page here, in this order: laneway suites, garden suites, secondary suites, multi-tenant houses, the City's housing target and the role of Neighbourhoods, how many suites and multiplexes the City has approved, the Ontario laws behind the new home types, parking rules, family-sized homes, and townhouses and low-rise apartments. Each page joins the list below this text when it is written. Until then, the two guide hubs for builders and owners hold the detail on multiplexes, Major Streets, the Committee of Adjustment and the costs.

Questions to ask about your own lot

• Which zone is my lot in, and does the zone allow a multiplex, a garden suite or a laneway suite?
• Does my lot share a property line with a public lane?
• Is my street on Map 3 of the Official Plan, which would make the Major Streets rules apply?
• Is my lot in the Toronto and East York District or Ward 23, where one building can hold six homes?
• If I add one home, does the lot stay at three homes or fewer, so the Ontario regulation applies?
• Is there a clear fire access route from the street to the back of the lot?

There is no obligation to sell, and no obligation to build. If you want a review of what your lot's zoning allows before any builder sees it, use the contact page. Before you ask what the houses beside yours sold for, ask the other question: what could this lot hold?