The building sector is challenged by an increasing demand for effective waste management and resource utilization to mitigate the environmental impacts, particularly contributing to climate change. This underscores the necessity of enhancing circular economy (CE) practices into the building sector by introducing more reuse and recycling into the end-of-life (EoL) management of building products. Building upon BTPFlux, a building material flow analysis model, designed by the Scientific and Technical Centre for Buildings (CSTB), the present study investigates how to better estimate the reuse potential of buildings within a given territory. The study proposes extensions to BTPFlux to integrate circularity indicators enabling a better characterization of material flows within a territory. This set addresses the difficulties of adapting for specific territories, giving them more visibility on the material flows within and enhances their comprehension. It also enables new functionalities: a decision-making platform facilitating the circularity of product for a group of actors, allowing them to pilot more easily. By quantifying material flows, identifying circular economy opportunities, and assessing impacts, stakeholders can tailor strategies to meet specific challenges and goals effectively. This research contributes to advancing circular economy practices in the construction sector and supporting sustainable development at the local level, exemplified through the Paris-Saclay case study.