Whether you can actually add one depends on your specific lot's zoning district and, for many properties, on parking and lot size as well, since the City of Saskatoon's zoning bylaw does not treat every residential lot identically. Confirming the district before designing anything saves real money.
Zoning clears the first gate, but the permit is what makes the space legal once it is built: egress windows, minimum ceiling height, fire separation between units and, in most cases, a separate entrance, all confirmed by a City of Saskatoon inspection before a lender will ever count the space as income. A buyer's own home inspection, typically $400 to $600, often catches what the permit file does not.
Whether adding one makes sense for a specific Saskatoon property depends on the lot, the zoning and the cost to bring the space to code. Joel Dyck can walk through what a specific address allows. Get your hand-reviewed valuation from Joel Dyck.