We have carried out several digitization campaigns of the cathedral, within the framework of the restoration projects led by the Chief Architects of the Historic Monuments, in order to provide the technical documentation necessary for the analysis and diagnosis work. Survey campaigns were carried out on the west facade, the towers, the roof and the spire. We have also carried out a complete 3D scan of the framework known as “the forest”, destroyed during the fire of April 15, 2019. We conducted an emergency 3D scanning operation right after this fire to establish the extent of the damage. Our complete BIM modelling of Notre-Dame is used in the restoration work.