3. Catering

The notion of conservation-restoration is equally vast, and we need to define its contours and, above all, the subtleties of the language that will lead to different levels of intervention.

• First and foremost, maintenance must be clearly distinguished from conservation and restoration, even though in practice these two fields may overlap and are always interdependent. The aim of maintenance is to ensure that the building is regularly monitored and cared for, so that its general condition enables it to retain its heritage value. This involves overall maintenance, regular cleaning of floors, windows, drainage systems, etc., as well as the maintenance of the building itself.

• Restoration aims to re-establish the essential functions of the building (appearance, structure, waterproofing, etc.) and can include identical...