When you buy a flat, the rules on the Sale of Goods Act apply. It is considered a fault if the flat does not correspond to what the parties agreed or the flat differs from what the buyer could reasonably expect.
The buyer will usually be advised to inspect the flat. If an inspection has been carried out, the buyer cannot thereafter cite faults which should have been noticed during the inspection. Essentially what this means is that the buyer has an obligation to examine the flat, just as if he or she was going to buy a property.
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