Published by City of Markham under Guide Building Permits
The City of Markham's guide to adding a coach house or garden home — both accessory suites to an existing house — under the 2024 Ontario Building Code and zoning by-law 2024-19. It distinguishes coach houses, built above a rear detached garage accessed by a lane, from garden homes, freestanding accessory buildings without lane access, and sets out each one's site setbacks, maximum area and height, and parking. It then covers fire separation, sound transmission ratings, egress, alarms, minimum room areas, and the building permit, inspection and Markham Fire and Emergency Services registration steps that follow.
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