Why "legal" matters so much here
Calgary's zoning changes have made secondary suites easier to legalize citywide, and that legal status is exactly what lenders care about. An illegal or unregistered suite generally can't have its income counted at all, no matter how much rent it's actually bringing in. Legal registration is the line between rental income that helps your application and rental income a lender simply ignores.
How the income actually gets counted
Lenders typically count a percentage of the suite's projected or actual rental income (commonly somewhere around 50 to 80%, depending on the lender and whether the suite is currently tenanted) toward your qualifying income. That can meaningfully raise your approved amount compared to qualifying on your income alone.
What you'll need to document
Proof of legal suite registration with the city, a lease or market rent appraisal if it's not yet tenanted, and sometimes a separate entrance or specific safety compliance documentation depending on the lender. This is one area where getting ahead of the paperwork before you apply saves real time.
Why this is such a Calgary-specific conversation
Not every city has made legal secondary suites this accessible, and it's a genuine opportunity for Calgary buyers looking to offset their mortgage or qualify for more house than their income alone would allow. It's a niche enough topic that not every lender or broker outside the city thinks to bring it up, which is exactly why it's worth asking about directly.
Buying with a secondary suite in mind?
We'll show you how much that rental income could realistically add to your qualifying amount.
Factor in my suite income