What's a typical cap rate for a Toronto secondary suite?

Cap rate calculations for investment properties are outside my expertise as a construction advisor — that's really a question for a real estate agent, mortgage broker, or financial advisor who specializes in Toronto investment properties.

What I can help you with is the construction and renovation side of adding a secondary suite in Toronto, which directly affects your bottom line as a landlord.

Building a legal secondary suite in Toronto involves several layers of requirements that affect your upfront costs and long-term value. Under Toronto Municipal Code Chapter 150.67, secondary suites must meet minimum size requirements, have separate entrances, proper egress windows, fire separation between units, and dedicated HVAC. The Ontario Building Code (OBC) sets the baseline for ceiling heights (minimum 1.95m/6'5" in basements), smoke and CO detector placement, and insulation standards.

Typical construction costs for a basement secondary suite in the GTA run roughly:

• Basic conversion (existing basement, good condition): $60,000–$90,000
• Mid-range renovation (new bathroom, kitchen, egress windows, waterproofing): $90,000–$140,000
• Full gut and build (lowering, full waterproofing, premium finishes): $140,000–$200,000+

These numbers matter for your investment math — a legal, permitted suite commands significantly higher rent than an unpermitted one, and it protects you from liability and insurance issues if something goes wrong.

Permits are non-negotiable here. The City of Toronto Building Division (416-397-5330 or toronto.ca/building) handles secondary suite permits, and inspections cover electrical (ESA), plumbing, and structural. An unpermitted suite can void your home insurance and create serious legal exposure with tenants.

Your next steps would be to consult a real estate investment advisor for the financial modeling, then connect with a contractor to get a realistic build cost for your specific property — those two numbers together will give you a much clearer picture of your return.

Browse experienced renovation contractors in our directory at the Toronto Construction Network to get quotes from local pros who know secondary suite requirements inside and out.