The vendor has the obligation to reveal the exact superficial area of its private portion. The superficial area/price ratio is an important criteria for many buyers. It has a major influence on their decision to purchase
Off plan sale
The calculation of the superficial area of an apartment may lead to a conflict if, in an off plan sale, the gross area shown on the architectural plan is the information used for the transaction. Thus, you should insist that the developer supplies a detailed plan of the apartment to be built, along with the method used to determine the superficial areas.