Saskatchewan's building and fire regulations require a carbon monoxide detector near any fuel-burning appliance or attached garage, which matters most in older homes with a furnace, gas fireplace or water heater that predates current code. A missing detector is a cheap fix but an easy thing to miss on a quick walkthrough.
Your agent should treat this as a possession-day checklist item, confirmed at the final walkthrough alongside working smoke detectors on every level of the home, not assumed based on what the seller's disclosure statement says.
It is a small check with an outsized safety payoff, and it costs nothing to confirm before you take possession. Get your hand-reviewed valuation from Joel Dyck.