The rehabilitation of the mining city of Onnaing is part of a massive renovation project of the mining heritage, as part of the Mining Basin Renewal. Today SIA Habitat makes the choice in addition to thermal rehabilitation, to go further in improving the living conditions of the inhabitants. Thus, it was decided for this city, to add work to improve the habitability of these housing and support to aging. The project presents rehabilitation works for 127 dwellings: (128 dwellings including 2 dwellings restructured into 1 dwelling). - indoor thermal insulation with bio-based materials (wood wool) to improve winter comfort by better regulating humidity and summer comfort by increasing the inertia of housing. - installation of a type B hygro-regulable CMV, - replacement of exterior joinery - replacement of roofs - restructuring of 2 dwellings into 1 dwelling for a living area more consistent with the composition of the household. The main objective of this rehabilitation is to reduce primary energy consumption and greenhouse gas emissions and thus to switch from an energy label F to C.