Habitat is the second largest source of greenhouse gas (GES) emissions in Lower Normandy, after transport. It is a major expenditure pole for families. More in detail, in Basse-Normandie, 52 % of energy consumption relates to residential and tertiary buildings, 33 % of which is for housing alone. Thermal renovation is thus an environmental, social and economic priority in Basse-Normandie, with a desire for innovation, particularly in terms of eco-materials.In addition to the interest Cherbourg-Octeville and its lessor Les Cités Cherbourgeoises have in energy efficiency, this question drives a territory on a wider scale. Indeed, this project shows a real integrated territorial approach since it is part of, inter alia:- departmental priorities with its “Sustainable Calvados” approach launched in 2007 — regional priorities, indeed, the Regional Council of Basse-Normandie has made the energy issue one of its priorities and has chosen to rely on a “sustainable development policy” to make Lower Normandy an exemplary territory in this area. Also eco-construction, energy saving and natural resource management are at the heart of its actions.- of the various Agendas 21 of the different scales of communities- of the different PCET Plan Climate Energy Territorial of the various communities- of the SCRAE — Regional Plan Air Climate Energy — European priorities including first the Europe 2020 Strategy, with regard to the priority to the low-carbon economy climate change and sustainable energy and secondly to the provisions of the ERDF. The energy and thermal renovation of these homes meets the various targets set by 2020 such as the reduction of GHG emissions by 20 % compared to 1990 and the 20 % increase in energy efficiency.Finally, this project also demonstrates the investment of the commune and the cities of Cherbourg to reduce GHG emissions, and to move towards a green, sustainable and eco-responsible approach. General presentation of the operation The project consists of the energy and thermal renovation of a residential stock of 25 dwellings/pavilions located in the municipality of Cherbourg Octeville.This energy and thermal renovation will enable the transition from class F to class B.These works will enable the BBC label to be achieved in accordance with the relevant specifications.The purpose of these works is to achieve cost savings (taking into account energy consumption, subscription and maintenance of complementary equipment).Works carried out:- Replacement of wood exterior carpentries by PVC joinery-replacement of the doors ramps, heating-replacement of the garage-replacement of the garages