Lenders treat a half-duplex and a whole duplex as different products, even when the buildings are identical. A half-duplex purchased as your home is generally underwritten like a standard residential purchase — your income, your down payment, the property’s value. A whole duplex adds a rental file on top: the second unit’s rent (actual leases where they exist), rental-income rules that vary by lender, and in many cases a larger down payment expectation, especially if you will not live in one of the units. Know which file you are building before you write the offer, because the conditions and documents differ.

Photo via Wikimedia Commons.

Half-duplex: the straightforward file

If you will live in your half, expect a conventional owner-occupied application: income verification, down payment confirmation, and an appraisal of your unit. Two property details surface in underwriting — how the halves are titled and whether a party-wall or shared-facility agreement exists — which is why the buying-side checks in my companion guide matter to the lender too. Start the file with a Pre-Approval & Refinance Check so the pre-approval reflects the actual property type you are shopping for.

Whole duplex: how rental income is counted

Lenders typically use a portion of the rent — through a rental offset or by adding a share of the rent to your income — and the percentage and method differ by lender, which is one reason the same duplex can qualify very differently across institutions. Existing leases, market-rent appraisals for vacant units, and whether you will occupy one side all change the calculation. If you will not live there, expect investment-property rules, including a minimum 20% down payment under the standard framework. The small-landlord rules are explored further in rental property mortgages in Canada.

What documents should you gather before offering?

For the whole building: leases and rent history for both units, who pays which utilities, property tax and insurance figures, and any suite-legality documentation the seller holds. For your own file: the standard set in what documents a broker reviews up front. A duplex with a paper trail funds faster than a duplex with a story.

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House-hacking the whole duplex

Living in one unit and renting the other is the strategy that makes the math sing for many first-time Edmonton buyers — owner-occupied treatment on the purchase, rental income helping the budget, and a tenant next door instead of across town. It deserves a full numbers session before you shop, not a rule of thumb.

Thinking duplex — half or whole — in Edmonton? Call (780) 722-5621 — I will try to call you this week, or reply with a good time and we will set a phone appointment to run both files with real rents and real rules.

By Travis Bannert, Realtor and Mortgage Broker

Travis Bannert, Mortgage Broker | Next Door Mortgages, BFL Dominion Lending Centres | (780) 722-5621 | nextdoormortgages.com