A conventional mortgage is a common option for Canadian home buyers who can make a larger down payment. The main distinction is simple: a conventional mortgage is uninsured, which can affect your monthly costs, your access to home equity, and how lenders view your application.
What a conventional mortgage means
In Canada, a conventional mortgage is a residential mortgage where the borrower puts down at least 20% of the purchase price. Because the loan-to-value is 80% or less, the mortgage does not require mortgage default insurance (often called CMHC insurance, though other insurers exist).
Example: If you buy a $500,000 home and put down $100,000 (20%), you borrow $400,000. That mortgage is typically considered conventional.
Conventional vs. high-ratio mortgages
The opposite of a conventional mortgage is a high-ratio mortgage, where the down payment is less than 20%. High-ratio mortgages must be insured through one of Canada’s mortgage insurers (such as CMHC, Sagen, or Canada Guaranty), and the premium is generally added to the mortgage balance, increasing payments and total borrowing costs.
- Conventional: 20%+ down, no mortgage default insurance required.
- High-ratio: Under 20% down, mortgage default insurance required, premium cost depends on down payment and purchase price.
Also note: Homes priced at over $1 million generally require a minimum 20% down payment, which means buyers in this price range won’t qualify for insured high-ratio mortgages.
Why buyers choose a conventional mortgage
One of the biggest advantages is immediate equity: with 20% down, you start with a meaningful ownership stake. That can matter for financial flexibility and borrowing options.
- No default insurance premium: avoiding the insurance premium can reduce overall borrowing costs.
- More built-in equity: lenders may view you as lower risk due to the larger down payment.
- Potential access to home equity products: with more equity, you may qualify for options like a home equity line of credit (HELOC), depending on lender policies and your finances.
HELOCs: useful, but not risk-free
A HELOC is different from a mortgage payment schedule. It’s a revolving credit line secured against your home’s equity, and you typically pay interest on what you use. While it can be handy for renovations, emergencies, or debt consolidation, it comes with important risks.
- Rates can be higher: HELOC interest rates are often higher than mortgage rates.
- Payment flexibility can backfire: paying interest-only can keep the balance from shrinking.
- Lender terms can change: a lender may reduce or demand repayment under certain conditions, so it’s wise to treat it as a tool, not free money.
Conventional vs. collateral mortgages (not the same thing)
“Conventional” is often confused with “collateral,” but they refer to different things. A collateral mortgage is typically registered in a way that can be re-advanceable—as you pay down the mortgage or your property value rises, you may be able to borrow more without a full refinance (depending on lender rules). This setup is sometimes linked to combining a mortgage with a HELOC.
A conventional mortgage, by contrast, mainly refers to the down payment and insurance status (uninsured), not how the charge is registered on title.
What affects conventional mortgage interest rates
There is no single “conventional mortgage rate.” Your offered rate depends on multiple factors, including:
- Credit history and overall financial profile
- Term length (for example, 3-year vs. 5-year)
- Amortization period
- Fixed vs. variable rate choice
- Prime rate environment
- Loan amount and property details
A larger down payment can help you look lower risk, but it doesn’t automatically guarantee the best rate. Comparing lenders and products still matters.
The mortgage stress test still applies
Even if you qualify for a conventional mortgage, you still need to pass Canada’s mortgage stress test. Lenders must ensure you can afford payments at the higher of the qualifying rate or your contract rate plus a buffer. In practice, this can reduce the maximum amount you can borrow, even with 20% down.
Planning tips before you apply
- Check your credit early: small improvements can affect approvals and pricing.
- Budget beyond the down payment: include closing costs, moving costs, and a cash cushion.
- Shop the market: compare rates, features, and prepayment terms—not just the headline rate.
- Think ahead to renewal: understand penalties, portability, and whether a collateral charge could affect switching lenders later.
Practical takeaway: If you can put 20% or more down, a conventional (uninsured) mortgage can help you avoid default insurance and start with stronger equity—just be sure to compare offers and features so the mortgage fits your long-term plans, not only today’s rate.