A BIM model works like a real-life virtual model. It combines visibility with technical rigor, which is of great value in the pre-construction for dimensioning and the detection of overlaps (structure vs. installations for example). It supports simulations of the different conditions and technical solutions that can be considered. In the building process, it is a great support as a resource for planning or quantifying the progress of the projects. As an asset management tool, it qualitatively increases quality.