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Real Estate

What extra steps are involved in financing a fourplex compared to a single-family home in Ontario?

TSL Written by the Treadstone Law team· Updated August 2026

Whether financing a fourplex looks like financing a single-family home depends heavily on whether you plan to live in one of the units. CMHC's mortgage loan insurance for owner-occupied properties covers buildings of one to four units, with minimum down payment tiers that generally apply the same way to a fourplex as to a single-family home, provided you will genuinely occupy part of it as a high-ratio buyer with less than a 20% down payment.

If you will not live there, lenders generally treat the purchase as an investment property rather than owner-occupied financing, which typically means a different qualification process, since the existing or projected rental income is weighed alongside your own finances rather than the property being treated like a home you will live in. Lenders also look more closely at the existing leases, the rent roll, and the building's condition than they typically would for a single-family home purchase. Because the financing path depends so much on occupancy plans and the lender's specific criteria, speak with a mortgage professional early about how your particular fourplex purchase will be assessed.

Key takeaways

  • Occupancy plans largely determine which financing path applies to a small multi-unit purchase.
  • Owner-occupied CMHC-insured financing can cover buildings of one to four units under set criteria.
  • Non-owner-occupied purchases are typically underwritten more like an investment property.
  • Existing leases, rent roll, and building condition get closer scrutiny than a single-family purchase.
This is general information, not legal advice. It doesn’t create a lawyer–client relationship, and the rules can change. For advice on your situation, a Treadstone real estate lawyer can help.
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