Home / Garden and Laneway Suites
Most residential lots in Ontario can now add a detached suite without a rezoning. As-of-right is not the same as automatic, and the gap between the two is where projects stall.
A garden suite and a laneway suite are both self-contained detached dwelling units in the rear yard of an existing house, with their own kitchen, bathroom and entrance. The difference is access. A laneway suite sits on a lot that abuts a public laneway and takes its access from that lane. A garden suite is the option for every other lot, reached from the street through a side yard.
Toronto permitted laneway suites first, in 2018, and extended the concept to garden suites in 2022. Most other Ontario municipalities followed with their own implementing by-laws.
One point that surprises people: you get one detached suite per lot, not both. If your property abuts a laneway you are building a laneway suite. If it does not, you are building a garden suite. The naming matters because the standards differ.
Three things happened in sequence and they are often collapsed into one.
The More Homes Built Faster Act, 2022, commonly called Bill 23, required Ontario municipalities to permit up to three residential units on most urban residential lots without a rezoning. In practice that is the main house, an interior unit such as a basement apartment, and one detached suite in the rear yard.
Ontario Regulation 462/24 came into force in November 2024 and harmonised the standards for additional residential units across the province, setting a floor that municipal by-laws have to meet.
Toronto then updated Zoning By-law 569-2013 through By-laws 847-2025 and 849-2025 to align with the provincial regulation. Other municipalities have been doing the same on their own timelines, which is why the rules in Mississauga, Brampton and Markham resemble Toronto's without being identical.
As-of-right means that if your proposal meets every standard in the zoning by-law, the municipality must issue the building permit. No rezoning, no Committee of Adjustment, no hearing. That is a real change and for a lot of projects it is the end of the planning question.
The catch is the word every. Height, separation from the main house, rear and side yard setbacks, lot coverage, floor area, angular planes and soft landscaping all have to comply at once. Miss one standard by a small margin and the as-of-right route closes, because the by-law does not have a tolerance band.
The standards themselves also move. Toronto has amended these provisions in 2018, 2022 and again in 2025, and municipalities outside Toronto are still working through their own alignment with O. Reg. 462/24. Anything you read that quotes a specific maximum floor area or a parking requirement should be checked against the by-law in force in your municipality on the day you apply, not against a guide written last year.
Two things sit outside the zoning by-law entirely and stop more of these projects than the zoning does. If there are protected trees on or near the build site, tree protection requirements apply and can force a redesign after the drawings are done. If the property is in a Heritage Conservation District or is a listed or designated property, exterior work carries a separate heritage process.
If the design misses one or two standards, the route is a minor variance to the Committee of Adjustment. The application has to satisfy the four tests under Section 45(1) of the Planning Act: the variance must be minor, desirable for the appropriate development of the land, and maintain the general intent and purpose of both the Official Plan and the zoning by-law.
Detached suites are usually a good fit for that test, because the use itself is already permitted. You are asking for relief on a dimension, not on a principle, which is a much easier argument than it was before Bill 23.
The other route is to redesign to comply. That is often cheaper and always faster, and an honest planning opinion should tell you which of the two makes sense before you spend anything on drawings. Sometimes moving a wall by half a metre is worth more than winning a hearing.
The mistake worth avoiding is finding out in what order. Confirm the zoning envelope before commissioning detailed architectural drawings, and commission the arborist report before that. Discovering a tree protection issue after the drawings are paid for is the most common avoidable cost in this process.
If your suite complies as-of-right you do not need a planning application at all, and we will tell you that. See the full pricing schedule or the Minor Variance page.
Related guides: The four tests · How the Committee works · Tree permits
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