The law of 12 July 2010 (Grenelle 2), the decree of 27 January 2012 and the order of 28 February 2013 make it mandatory for all co-ownerships of 50 units or more with shared heating to carry out Energy Audits. Once the audit is complete, a plan detailing the energy saving works to be carried out must be included in the agenda for the co-owners' general meeting.