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

  • Writer: Henry Matthew Silva Rojas
    Henry Matthew Silva Rojas
  • Jul 9
  • 1 min read
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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.


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