Ontario Building Code 2024 Changes — What You Need to Know

The Ontario Building Code saw significant updates in 2024, continuing the province's push to increase housing supply. Here are the key changes that affect building permit applications and what they mean for your project.

Key Changes

• Multiplex permissions: Up to four units now permitted on most residential lots province-wide
• Secondary suite permissions: Additional residential units allowed in all residential zones
• Reduced parking requirements: Municipalities can no longer require parking for additional units in many zones
• Streamlined approvals: New timelines for municipal permit processing
• Energy efficiency: Updated SB-10 and SB-12 requirements for new construction

Impact on Your Project

These changes create new opportunities for homeowners and developers. If you've been thinking about adding units to your property — whether a basement apartment, garden suite, or multiplex conversion — the regulatory landscape is now more favourable than ever.