In most Toronto neighbourhoods, yes. A garden suite is a detached residential unit built in the rear yard of an existing property. The City of Toronto permits garden suites as-of-right on most residential lots, provided the design complies with zoning and building code requirements.
For homeowners, that means a legal, self-contained unit in the backyard. Rental income. Housing for family members. Flexible space that adds long-term value.
Quadrant Architects is a Toronto garden suite architect licensed by the Ontario Association of Architects (OAA). We design garden suites from feasibility through building permit approval, working directly within Toronto’s garden suite bylaw requirements including angular plane rules, setback restrictions, height limits, and lot coverage controls.
A garden suite is a self-contained dwelling unit located in the rear yard of a property, separate from the main house. It has its own entrance, kitchen, bathroom, and living space.
Unlike a basement apartment, it is not within the existing house. Unlike a laneway suite, it does not require rear lane access.
Garden suite, backyard suite, and accessory dwelling unit (ADU) refer to the same housing type. The City of Toronto uses the term ‘garden suite’ in its zoning bylaw. Before design begins, lot dimensions, rear yard depth, existing coverage, heritage status, tree protection, and servicing capacity must all be reviewed. Eligibility varies property by property.
Toronto introduced garden suite permissions in 2022 through its Expanding Housing Options in Neighbourhoods (EHON) initiative. Garden suites are permitted as-of-right when they comply with zoning standards. No rezoning. No Committee of Adjustment. No minor variance, if the design meets the bylaw envelope.
The distinction matters when assessing your property’s options.
A detached backyard unit on a lot without rear lane access. The unit is accessed through the side yard or from the front of the property.
A detached backyard unit on a lot with rear lane access. The unit faces and is accessed from the lane.
Some lots qualify for one. Some qualify for both. We confirm which applies during the feasibility review.
The City of Toronto sets specific parameters for garden suites under Bylaw 569-2013. These are the current requirements as of 2026.
REGULATORY NOTE: Height, lot coverage, setback, GFA, and FSI rules below are verified against Toronto Zoning Bylaw 569-2013. Earlier published versions of this page contained errors in the height, lot coverage, and setback rules. The corrected rules are reflected here
| Regulation | City of Toronto Requirement (Bylaw 569-2013) |
|---|---|
| Maximum height | 4.0 m if the garden suite is located 5.0 m to less than 7.5 m from the main residential building. 6.0 m if located 7.5 m or more from the main building. Maximum 2 storeys in all cases. |
| Gross floor area (GFA) | The interior floor area of the garden suite must be less than the GFA of the main residential building on the lot. Garden suite GFA is not included in the lot's overall GFA or FSI calculations. |
| Lot coverage | The garden suite footprint is NOT included in the overall lot coverage calculation. However, the garden suite footprint may not exceed: (i) 20 percent of the lot area, AND (ii) the lesser of 40 percent of the area between the rear main wall of the residential building and the rear lot line, or 60 sq. m. |
| Rear setback | The greater of 1.5 m or half the garden suite height. |
| Side setback (wall with openings) | Where the side wall has doors or windows: the greater of 1.5 m or 10 percent of lot frontage, to a maximum of 3.0 m. |
| Side setback (wall without openings) | Where the side wall has no openings: the greater of 0.6 m or 10 percent of lot frontage, to a maximum of 3.0 m. |
| Setback from main house | Minimum 5.0 m between the garden suite and the rear wall of the principal dwelling. |
| Angular plane | A 45-degree angular plane measured from each side property line restricts upper-level massing. This is the constraint that most affects two-storey design viability on narrower Toronto lots. |
| Parking | No additional parking is required for a garden suite. |
These are baseline standards under Bylaw 569-2013. Heritage overlays, tree protection requirements, and site-specific conditions can further restrict what is buildable. As-of-right permission is a starting point. Feasibility determines what actually fits on your specific property.
The City of Toronto introduced garden suite permissions in 2022 under its Expanding Housing Options in Neighbourhoods (EHON) initiative -the same policy framework that permits multiplex housing citywide. Garden suite permissions apply within the City of Toronto boundary. Properties in Mississauga, Markham, Vaughan, and other GTA municipalities are governed by separate bylaws. If your property is outside Toronto, we confirm applicable permissions during the feasibility review.
Common constraints that disqualify a site or significantly limit the design:
After applying the 5.0 m separation from the main house and the rear setback (greater of 1.5 m or half the garden suite height), some lots do not have adequate buildable depth for a viable footprint.
Side setbacks and the angular plane can reduce usable width to the point where a functional layout is not achievable. On lots under 7.5 m wide, even a one-storey design may be significantly constrained.
If the house and existing structures already consume the maximum permitted garden suite coverage (20 percent of lot area or the lesser of 40 percent of rear yard area or 60 sq. m.), additional footprint requires removing other structures first.
Properties within Heritage Conservation Districts may face additional review or restrictions on new rear yard construction.
Water, sewer, and electrical capacity must support the additional dwelling unit. Older properties on undersized service laterals may require upgrades that materially affect project economics.
The City of Toronto’s Private Tree Bylaw can restrict where a foundation can be placed in the rear yard.
After applying the 5.0 m separation from the main house and the rear setback (greater of 1.5 m or half the garden suite height), some lots do not have adequate buildable depth for a viable footprint.
Side setbacks and the angular plane can reduce usable width to the point where a functional layout is not achievable. On lots under 7.5 m wide, even a one-storey design may be significantly constrained.
If the house and existing structures already consume the maximum permitted garden suite coverage (20 percent of lot area or the lesser of 40 percent of rear yard area or 60 sq. m.), additional footprint requires removing other structures first.
Properties within Heritage Conservation Districts may face additional review or restrictions on new rear yard construction.
Water, sewer, and electrical capacity must support the additional dwelling unit. Older properties on undersized service laterals may require upgrades that materially affect project economics.
The City of Toronto’s Private Tree Bylaw can restrict where a foundation can be placed in the rear yard.
We identify these constraints during the feasibility review before any design fees are committed. If a property does not work for a garden suite, we tell you directly. In some cases a different intensification approach on the same lot makes more sense.
A garden suite is a complete, self-contained dwelling, not a shed conversion or a prefab module dropped in a rear yard. Every design must satisfy Toronto’s zoning bylaw requirements, the Ontario Building Code, and the practical requirements of someone living in the unit year-round.
The angular plane restriction often determines whether a two-storey design is viable. On many standard Toronto lots under 7.5 metres wide, a well-designed single-storey unit provides more usable space than a constrained two-storey massing. On a recent project in Leslieville, the angular plane shaped the entire roof form. A shed roof sloping away from the neighbour’s property line was the design solution that maximized interior volume within the bylaw envelope. We work through this in early concept design, before detailed drawings begin.
Window placement in side walls triggers the higher setback requirement under Bylaw 569-2013. A side wall with doors or windows requires the greater of 1.5 m or 10 percent of frontage. A side wall without openings requires only the greater of 0.6 m or 10 percent of frontage. Resolving window placement at concept stage means setback implications are understood before detailed drawings begin, not after.
Garden suites fall under Part 9 of the Ontario Building Code in most configurations, the same code path as detached houses. Part 9 governs structural requirements, minimum ceiling heights, egress windows, insulation, and mechanical systems. The unit must function as a year-round dwelling. Adequate heating, ventilation, and insulation standards are not optional.
Connecting the garden suite to water, sewer, and electrical services is one of the most variable cost factors in any project. In some cases the existing service lateral accommodates both units on a shared connection. In others, a separate connection is required. We identify the servicing approach during feasibility because it significantly affects overall project cost.
Structural engineering is typically required. Geotechnical review may be necessary depending on foundation type and site conditions. We coordinate required consultants and integrate their documentation into the permit package before first submission to Toronto Building.
The City of Toronto offers pre-approved garden suite plans. These standardized designs have already passed zoning and building code review and may reduce design time on certain lots.
Limitations include:
On straightforward lots, a pre-approved plan may work. On constrained or irregular sites, custom design typically produces better results and fewer permit complications. We assess both options during the feasibility review.
Construction costs vary by size, foundation type, finishes, and servicing requirements. For budgeting purposes:
These are reference ranges, not quotes. Site-specific feasibility is required for accurate budgeting. We do not provide cost estimates without first understanding what is involved on the specific property.
Garden suites may be eligible for CMHC’s MLI Select program and certain municipal financing programs. A mortgage broker or financial advisor familiar with residential intensification is the right person to assess financing options for your specific situation.
Most problems arise before design begins. A feasibility review resolves them before any design fees are committed.
Building a garden suite in Toronto follows a defined process from feasibility through final inspection:
On many Toronto properties, a garden suite is not the only intensification option. If the main house also qualifies for a multiplex conversion, the two can be designed as part of an integrated project. A triplex in the main house plus a garden suite in the backyard can create four or five dwelling units on a standard Toronto lot.
We assess the full potential of each property during the feasibility review: what the main building can support, whether the rear yard qualifies for a garden suite, and whether designing both simultaneously makes sense from a cost and permitting perspective.
Learn more about multiplex design in Toronto: Multiplex Architect Toronto
A: The garden suite footprint may not exceed 20 percent of the lot area, and must not exceed the lesser of 40 percent of the rear yard area or 60 sq. m. The interior floor area must be less than the GFA of the main residential building on the lot. The garden suite GFA is not included in the lot’s overall GFA or FSI calculations. On many Toronto lots, the angular plane restriction and setback requirements make even the maximum permitted coverage difficult to achieve.
A: An architect is not always legally required, since most garden suites fall under Part 9 of the Ontario Building Code where BCIN-registered designers can prepare drawings. However, the City of Toronto’s garden suite bylaw involves angular plane calculations, setback rules that depend on wall openings, and site-specific zoning conditions that require careful interpretation. Working with an OAA-licensed architect reduces permit deficiency risk, optimizes the design within the bylaw envelope, and produces drawings less likely to trigger multiple rounds of examiner comments.
A: Typically 8 to 14 weeks for complete submissions on straightforward projects at the City of Toronto Building Division. Projects involving heritage properties, tree protection issues, or unusual site conditions take longer. Incomplete or non-compliant initial submissions are the most common cause of delays. Examiner comments require revised drawings, which reset the review timeline.
A: Yes. Garden suites are permitted as long-term rental units governed by Ontario’s Residential Tenancies Act. There are no short-term rental restrictions specific to garden suites beyond the city’s general short-term rental rules, which require the principal residence to be the host’s primary home.
A: Yes. The City of Toronto permits garden suites up to two storeys. The maximum height is 4.0 m if the garden suite is located 5.0 m to less than 7.5 m from the main building, and 6.0 m if located 7.5 m or more from the main building. The angular plane restriction from side property lines can significantly reduce buildable volume on narrower lots. On a 25-foot lot, a two-storey design requires careful massing work to stay within the angular plane envelope while achieving livable floor areas on both levels.
A: Yes. Garden suite, backyard suite, and accessory dwelling unit refer to the same housing type. The City of Toronto uses ‘garden suite’ in its zoning bylaw. The City of Toronto’s garden suite bylaw under Bylaw 569-2013 governs design and permitting within Toronto regardless of which term is used.
A: A laneway suite has rear lane access and faces the lane. A garden suite does not have rear lane access and is accessed through the side yard or from the front of the property. The zoning regulations and design considerations differ between the two. If your lot has rear lane access, you may qualify for a laneway suite. If it does not, a garden suite is the applicable option. Some lots qualify for both. We confirm which applies during the feasibility review.
Before committing to design, confirm what your lot can legally support. We review zoning, rear yard depth, lot coverage, servicing, tree protection, and heritage conditions before any drawings begin.
A 30-minute zoning review prevents months of redesign.
Every member of our team has advanced education in architecture and design
M.Arch Architect, OAA
Principal
M.Arch.BCIN
Principal
M.Arch.BCIN
Principal
