A listing that overstates square footage or omits an unpermitted improvement creates a problem later, either at appraisal or at a buyer's home inspection, typically $400 to $600, when the discrepancy surfaces and undermines trust in the rest of the listing.
It also means sequencing the marketing correctly: professional photos and a written description ready before the first showing, not fixed after buyers have already seen a weaker version, since a first impression on a listing photo is hard to walk back once buyers have scrolled past it.
Getting the listing itself right the first time protects the price. Get your hand-reviewed valuation from Joel Dyck.