Going Triplex? Don’t Miss These 5 Must-Know Rules

Here are the Top 5 Things You Need to Know about triplex conversions in Ontario:

1. Ceiling Height Requirements Changed:

All 3 units must now have 6'-11" minimum ceiling height (not 6'-5" like duplexes).

2. Exits Matter:

Each unit needs its own dedicated exit or share 2 exits total. And YES—egress windows are still required!

3. You Can’t Keep Old Drywall:

To meet fire and sound ratings, you’ll need a 1-hour rated floor assembly (think: "5/8" fire rated drywall PLUS rockwool insulation = 50 STC too)..

4. Soft Costs Go Up:

You’ll likely need engineered drawings for HVAC and Plumbing. Not usually required for duplexes, but mandatory now.

5. Attic Units = High Effort:

Great ROI—but tricky to design exits and ceiling height. Get creative and call in the pros early.

Download PDF