Published by City of Markham under Guide Building Permits
The City of Markham's guide to adding a secondary suite — also called an accessory suite, second suite or secondary unit — within a detached, semi-detached or row townhouse dwelling, under the 2024 Ontario Building Code and zoning by-law 2024-19. It covers minimum setbacks and parking, the smoke-tight barrier and fire separation between the two units, sound transmission ratings, egress, alarms, minimum room areas, ceiling heights and door sizes, then the building permit application, inspection stages and Markham Fire and Emergency Services registration that follow construction.
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