Energy rehabilitation of 63 housing units — Ilot Gay Lussac — Bats 25,26 and 27) in Cosne Cours sur Loire. This operation is located in the Saint Laurent district, the first social housing district in the municipality with almost 85 % of the social housing of the Ville Cosne Cours Sur Loire. Nièvre Habitat, the Departmental Public Office of Habitat of the Nièvre is a non-profit organisation affiliated with the H.L.M. movement whose main activities are construction, rehabilitation, improvement of housing and rental. The restructuring of 64 existing housing units in 63 units in Cosne Cours sur Loire (deletion of housing in Building 26 to set up the elevator, Saint Laurent district, is part of the strategic heritage plan of Nièvre Habitat, and the first phase of the PRU. This restructuring should make it possible, on the one hand, to improve the energy performance of housing by reducing energy consumption, and on the other hand to improve and modernise the existing housing in this area through the accessibility and comfort of housing, with the aim of renewing the supply of heritage and reducing the vacancy in the park.