 The paper proposes a novel methodology for converting existing buildings from non-residential use to residential use. It focuses on energy efficiency and the circular economy, and applies digital technologies such as BIM and GIS to facilitate the process. The methodology consists of two phases, I, defining evaluative parameters for the potential reuse of a building, and II, integrating the evaluation system in a BIM and GIS environment. The results are a tool for rapid automatic pre-evaluation of the potential conversion of a building into a residential space. By applying this methodology, it is possible to manage and transform abandoned or degraded buildings into more efficient and sustainable structures. This article was authored by Federico Sinquapalmi, Spartaco Paris, Elisa Pinacchia, and others. We are article.tv, links in the description below.