Real estate professionals must tell you anything they know about any material fact they have about the home. If a licensed home inspector, or a licensed tradesperson, brings to their attention a flaw, yes, it must be disclosed. However, most licensed agents these days will not follow around home inspectors for that very reason. Otherwise, they would be in the position of having to disclose a veritable laundry list of defects on every house they have inspected. The home inspector works for the buyer, so normally the buyer, and perhaps their agent, has access to that report. If a particular safety or structural issue comes to light, the buyers will either back out of the deal or will try to negotiate the repair or a reduction in price. Typically, the buyer's agent will provide appropriate pages of the home inspection regarding these specific items, but not the entire report. If the buyer and seller cannot come to terns on the problem, and the deal comes apart, the listing agent is required to disclose what they know to be true. However, it the "flaw" is one stated by a non-professional (like a wonderfully concerned uncle offering his opinion), or out of the tradesperson's area of expertise (for instance, and electrician having an opinion on the condition of the roof), then the seller is not obligated to disclose such opinions.