Can I have a secondary suite in my basement if my Toronto neighbourhood is zoned residential only?

Yes — Toronto's city-wide zoning bylaws now generally permit secondary suites as-of-right in most residential zones, meaning you do not need a zoning variance or special permission to create a legal basement apartment in a residentially-zoned neighbourhood. This is a significant change from years past when many Toronto neighbourhoods effectively prohibited basement apartments through zoning restrictions, and it reflects the city's recognition that secondary suites are essential to addressing the GTA's housing supply crisis.

The City of Toronto's Official Plan and Zoning By-law 569-2013 were amended to allow secondary suites in houses across most residential zoning categories, including detached, semi-detached, and row houses. This means homeowners in neighbourhoods like Leaside, Lawrence Park, the Kingsway, Willowdale, the Beaches, East York, and other traditionally single-family areas can build legal basement apartments without needing a zoning amendment or Committee of Adjustment approval — provided the suite meets all Ontario Building Code requirements and the property complies with applicable zoning standards.

However, "permitted as-of-right" does not mean "no rules apply." Your property must still meet certain zoning requirements to qualify, and these include standards around lot size, parking, and the physical characteristics of the suite. The City of Toronto generally requires one parking space for the main dwelling and may require an additional space for the secondary suite, depending on your location and the specific zoning provisions. If your property cannot accommodate the required parking, you may need a minor variance from the Committee of Adjustment — a process that involves a public hearing and notification of your neighbours, with decisions made on a case-by-case basis.

The suite itself must comply with zoning provisions regarding floor area, entrance location, and the overall appearance of the property. The City does not want secondary suite entrances to dramatically alter the streetscape, so exterior stairwells and entrances may be required to be at the side or rear of the house rather than the front. The suite cannot result in the property exceeding its permitted lot coverage or floor space index (FSI) maximums, though finished basement space is typically not counted toward FSI in most residential zones.

There are a few exceptions and special situations to be aware of. Properties in areas with heritage conservation designations may face additional review requirements for any exterior alterations, including new basement entrances. Properties subject to site-specific zoning bylaws or development agreements may have restrictions that override the general permissions. And while laneway suites and garden suites are now also permitted in many Toronto residential zones, these are separate from basement secondary suites and have their own set of requirements.

To confirm your specific property's eligibility, you can contact the City of Toronto Building Division or use the city's online zoning bylaw interactive map to look up the zoning for your address. A pre-application consultation with the Building Division — which is free — is highly recommended before you invest in design drawings or hire a contractor. They will confirm whether your property qualifies as-of-right or whether any variances are needed. Toronto Basement Remodeling can also help connect you with contractors experienced in navigating the secondary suite approval process in your specific neighbourhood.