Economy is one of the three pillars of sustainability and one of the parameters taken into account by many green building labels. In the construction industry, there exist many methods that evaluate the project cost; however, none of the current methods takes into account the location of the economic flows or the final stakeholders that benefit from them. This paper proposes a new methodology for tracing the economic flows of a project, by classifying costs into 5 categories: labour, materials, energy, infrastructure, taxes and overhead and in two levels: local and regional. The aim is to facilitate economic decision making for local authorities, construction managers and project investors and to make the social dimension of these flows and the generalized impact of the project on the local society apparent. The applicability of the new methodology is tested through some case studies. It is observed that such an analysis provides useful insights with respect to the economic flows going to direct labour vs overhead and taxes as well as regarding the spatialized distribution of the cost of a project.