Built in 1948, the residential program “former ICE” located in Mulhouse has a total of 59 housing units distributed within 3 buildings. In a difficult economic context, with a cost of energy constantly increasing, m2A Habitat decided to launch a rehabilitation of this property complex. The main objective of the work is to increase the energy performance of buildings to reach the BBC level, thus allowing tenants to achieve energy savings. Complementary works bring an improvement to the living environment and comfort of tenants (secure and rehabilitated).