What Nutana has instead of a rent index is steady demand: proximity to the University of Saskatchewan and the walkable Broadway Avenue strip keeps a wide pool of tenants cycling through the neighbourhood's older character homes. That demand supports rent, but it does not set it, since two suites of the same size can rent very differently depending on finish and legality.
Legal status decides more of the answer than square footage does. A permitted secondary suite, with a separate entrance, code-compliant egress windows and fire separation confirmed by the City of Saskatoon, rents to a wider pool of tenants and can be financed differently than an unpermitted space a landlord cannot advertise honestly as income.
Joel Dyck can pull genuinely comparable Nutana rental listings once a suite's permit status is confirmed. Get your hand-reviewed valuation from Joel Dyck.