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Question about Toronto secondary suites


Active Member
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Jan 25, 2017
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Hi, first if this is the wrong place to post this please move as needed.

I'm just investigating the Toronto regulations for secondary suites and one item caught my eye: General
2) Secondary Suite - Number Permitted in a Detached House, Semi-Detached House or Townhouse
Within a detached house, semi-detached house, or townhouse, each dwelling unit may have a maximum of one secondary suite. [ By-law: 549-2019 ]
(3) Secondary Suite - Number Permitted in a Detached House or a Semi-DetachedHouse in the R Zone
Despite regulation, in the R zone, each dwelling unit in a detached house or semi-detached house may have more than one secondary suite. [ By-law: 549-2019 ]

So 1 suite per dwelling, but it immediately then allows multiple suites in residential zones, at least in detached or semi-detached.
Is the reasoning for this to only allow limited units in areas where residences are being discouraged in general but homes might have been grandfathered in?, ie non-residential zoning?
Or something completely different?

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Sep 21, 2013
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Midtown Toronto
I believe the motivation of that exception is to allow a dwelling unit to have both a basement suite and a laneway suite (so two total secondary suites, in addition to the dwelling unit) within the zoning code.

I couldn't say why the regulation is written to provide exception specifically in just the R zone.