Timing matters more than most sellers expect. A major renovation can take 3 to 6 months to permit and complete through the City of Saskatoon, and if your listing window is under six months, that clock alone can rule the project out regardless of what it might return.
Buyers also do not always value a big renovation at cost. A finished basement or a rebuilt kitchen appeals strongly to some buyers and barely moves others, so the return depends on who is likely to buy your specific house, not on a general rule.
Joel Dyck can tell you before you start whether that specific renovation is worth the time you have left. Get your hand-reviewed valuation from Joel Dyck.