SIA wishes to rehabilitate the Province of Saint Albert in Lens. These are 194 mining dwellings classified as Unesco heritage. This rehabilitation operation is mainly thermal, it aims to reduce the costs associated with heating and hot water production by 79 %. The renovation is global and mainly aims at the energy performance of the building (Isolation of the facades from outside and inside, the rehabilitation and insulation of the roofs, the upgrading of electrical installations, the modification of heating and ventilation systems and the replacement of sanitary equipment if necessary.