Legal Basement Apartment Permit Drawings in Mississauga

Ontario Design Studio prepares BCIN-certified permit drawings for legal basement apartments in Mississauga. The City of Mississauga allows second units (basement apartments) in most residential zones subject to specific zoning and building code requirements. We handle the complete drawing package and help you navigate Mississauga's second unit registration process.

Mississauga Basement Apartment Requirements

• Minimum ceiling height of 1.95m (6'5") — underpinning available if needed
• 45-minute fire separation between units
• Proper egress windows in all bedrooms per OBC Section 9.9.10
• Separate entrance — interior or exterior
• Interconnected smoke and CO alarms
• Compliance with City of Mississauga zoning bylaw
• Second unit registration with the city

Related Services

• Legal Basement Apartment Permits — Ontario-wide
• All Building Permit Services in Mississauga
• Building Permit Drawing Cost Guide
• 2026 Basement Apartment Requirements

Frequently Asked Questions

Can I have a legal basement apartment in Mississauga?

Yes. The City of Mississauga permits second units (basement apartments) in most residential zones. You'll need to meet OBC requirements for fire separation, egress, ceiling height, and energy compliance, plus register your second unit with the city.