MarkhamBuilding PermitsSecond Suites
Secondary Suites 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
- Secondary Suite Guide for Homeowners
- For
- homeowner
- Building types
- All building types
- Pages
- 30
Overview
The City of Markham Building Standards' Secondary Suites Guide for Homeowners, dated April 2026, on adding a secondary suite (also called an accessory suite, second suite or secondary unit) within a detached house, semi-detached house or row townhouse, under the 2024 Ontario Building Code and Zoning By-law 2024-19. It covers minimum setbacks and parking, then fire separation, STC ratings, fire department access, exiting and egress, smoke and carbon monoxide alarms, room areas, ceiling heights, door sizes, natural lighting and building services, and closes with building permits, inspections and registration.
What it covers
- Background
- What Is A Secondary Suite?
- Zoning
- Minimum Setbacks
- Parking Requirements
- Ontario Building Code
- Fire Separation Requirements
- Wall / Floor STC Rating
- Exiting and Egress
- Smoke Alarms
- Carbon Monoxide Alarms
- Room Areas
- Ceiling Height
- Door Sizes
- How to Apply
- Building Permit Requirements
- Building Inspections
- Registration
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