MarkhamBuilding PermitsAdditional Residential Units
3 and 4 Dwelling Unit Building Conversions Guide for Homeowners
Published by City of Markham
This is the City of Markham’s document, as published on its website on 18 October 2026. The municipality may have changed it since: check the current version at the source. Legal notice
- Type
- Guide
- Published by
- City of Markham
- Date
- April 2026
- Also called
- 3 or 4 Dwelling Unit Guide for Homeowners
- For
- homeowner
- Building types
- All building types
- Pages
- 33
Overview
The City of Markham Building Standards' 3 and 4 Dwelling Unit Building Conversions Guide for Homeowners, dated April 2026, on converting a single or semi-detached house into a building with three or four dwelling units, 3 storeys or less and 600 m2 or less in building area, under the 2024 Ontario Building Code and Zoning By-law 2024-19. It covers site and parking requirements, fire and parking garage separations, STC ratings, egress windows, alarms, room areas, ceiling heights, door sizes and barrier-free accessibility, then building permits, inspections and registration.
What it covers
- Background
- What Are 3- or 4-Dwelling Unit Buildings?
- Zoning
- Site Requirements
- Parking Requirements
- Ontario Building Code
- Fire Separation Requirements
- Parking Garage Separation
- Wall / Floor STC Rating
- Exiting and Egress
- Egress Windows
- Smoke Alarms
- Carbon Monoxide Alarms
- Room Areas
- Ceiling Height
- Door Sizes
- Barrier-free Accessibility Considerations
- How to Apply
- Building Permit Requirements
- Building Inspections
- Registration
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