Rosewood is a newer southeast Saskatoon neighbourhood, and newer construction there generally means a suite is more likely to have been built with a permit from the start, though a buyer's lender will still want that confirmed with the City of Saskatoon rather than assumed from the build date.
A permitted secondary suite needs a minimum ceiling height, code-compliant egress windows and, in most cases, a separate entrance, and the income only counts toward a mortgage once that file exists. A $400 to $600 home inspection is worth budgeting on the suite specifically, not just the main house.
Joel Dyck confirms permit status on a Rosewood income unit before pricing it and prices it against genuinely comparable, legal suites. Get your hand-reviewed valuation from Joel Dyck.