The law of 13 December 2000 on solidarity and urban renewal (SRU law) aimed in particular to develop social and urban diversity in housing. As such, Article 55 of this law, codified in Articles L. 302-5 et seq. of the Construction and Housing Code (CCH), obliges certain municipalities to have a minimum proportion of social housing, according to criteria set out in this Code. This proportion is currently set at 25% or 20% of the number of main residences in the municipality, depending on the situation. The list of these municipalities is determined according to their population and their inclusion in an agglomeration or an inter-municipal authority for cooperation between local authorities (EPCI).
