Are you a contractor or property developer? If so, you are, under certain conditions, obliged to comply with the Housing construction law of July 9th, 1971, better known as the Breyne law.
This law is applicable to agreements relating to the acquisition of housing to be constructed or under construction, and to transfers of ownership of an existing dwelling with an order for conversion or extension works, insofar as the buyer or the client is obliged, in accordance with the agreement, to pay one or more deposits before the completion of the building.