Age matters more than most sellers expect. A furnace or roof with useful life left avoids the buyer discount entirely, while one at end of life gets priced against a repair estimate, so the value Saskatchewan REALTORS Association comparable sales credit is largely the discount prevented rather than a dollar-for-dollar addition.
A $400 to $600 home inspection is exactly where this gets tested, since an inspector will flag furnace age, roof condition and window seal failure specifically, and a seller who has already replaced those systems and kept the invoices walks into that inspection with nothing left for a buyer to negotiate against.
Joel Dyck collects those invoices and permits before listing and prices the improvements against comparable sales that lacked them, which is exactly the kind of documented work an online estimate cannot see. Get your hand-reviewed valuation from Joel Dyck.