No offence but I am curious where you got this impression (I assume you made a typo that you actually meant "seller has to disclose..."). Residential real estate transaction in Canada is based on the concept of "caveat emptor" which means "let the buyer beware." Only when the seller actively concealed latent defects or made material misrepresentation can the buyer recover certain damages after closing. I would appreciate if you could give me a source of your point; otherwise don't mislead people.