What the form does not replace is a separate common-law duty every seller carries regardless of paperwork: you must not actively hide or misrepresent a known material defect, such as a foundation crack, a past flood or an unpermitted structural change, from a buyer who asks or would reasonably rely on your answer. Declining to fill out the form does not remove that duty, it just removes the paper trail that normally protects you if a dispute ever comes up later.
For a seller whose home carries improvements that were never permitted, the disclosure statement is where that history either gets handled well or badly. An honest, specific answer, backed by receipts and photos where you have them, reads as confidence, and the City of Saskatoon's permit files reach back at least 10 years, which is precisely what a buyer's lawyer will pull if the form looks incomplete or vague.
Joel Dyck walks every seller through the disclosure statement before it goes to a buyer, matching each answer against what he actually saw in the home rather than what is easiest to write. Get your hand-reviewed valuation from Joel Dyck.