Eco-trans-faire - "Cross-border territorialised cooperation centre, lever for a local eco-construction and eco-renovation offer, to meet local housing, environmental, employment and training challenges, to enhance local heritage and reduce energy insecurity by supporting the change of actors (project owner, companies, etc.)". The geographical entity Wallonia-Lorraine-Luxembourg has a number of common points. These, given below, were the initiators of the project: A common living area in the Greater Region An old housing with the same characteristics An important potential for an offer in eco-renovation of existing buildings An increase in energy insecurity An increase in building companies little trained to the new technical constraints and to "work together" of the different trades; A mismatch between the supply in the building sector and the skills of job seekers An inadequate training offer for eco-construction and eco-renovation An unsuitability between banking products and financing requests An inadequate investment in research into eco-materials and the development of local sectors.