This is the City of Mississauga’s document, as published on its website on 19 October 2026. The municipality may have changed it since: check the current version at the source. Legal notice
- Type
- Guide
- Published by
- City of Mississauga
- Also called
- Code Guidelines for Second Units
- For
- any
- Building types
- All building types
- Pages
- 4
Overview
Mississauga's Guideline for Second Units, linked by the City as Second Unit Code Guidelines. It outlines Ontario Building Code items for a permit converting a single family dwelling into two dwelling units, in two tables, Building Plan Review and Mechanical Plan Review. Each row gives an item, its OBC Part 9 reference and the matching Part 11 compliance alternative: fire resistance ratings, sound control, exits, room and ceiling sizes, egress windows, spatial separation, smoke and carbon monoxide alarms, ventilation, heating and fire dampers. Footnotes explain Part 11 for existing buildings.
What it covers
- Building Plan Review
- Fire Resistance Ratings
- Sound Control
- Number of Exits and Exposure
- Design of Areas, Spaces and Doorways
- Windows and Spatial Separation
- Alarms
- Flame Spread Ratings
- Electrical Facilities
- Laundry Fixtures
- Mechanical Plan Review
- Ventilation
- Heating and Air-Conditioning
- Fire Separation Openings
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