The research work on the Adaptive Reuse of urban empty spaces, started from the reflection of the current model in making city. A model of growth that develops in a built environment, but does not take into account urban vacuums as a resource of opportunity; nor does it recognise the different emerging collaborative, social and sustainable practices that are betting on a new urbanism.

The research consisted of the description and analysis of the process of different interventions carried out in urban empty spaces, and the experience of the PlaBUITS in Barcelona, as a case study. The methodology used was based on the analysis of both the plan, as well as information sheets on the interventions in the different spaces. With these data, it was possible to propose an assessment tool that can highlight the criteria of use, design and management that have been considered for the reactivation of these empty spaces. The foregoing favored, consecutively, the formulation of guidelines for intervention, which are open and perfectible.

Subsequently, it was possible to reflect and conclude on public policies that do not start from citizen participation as a process of involvement. These conclusions are intended to help to obtain an alternative vision of the processes that can be given for the efficient regeneration of our cities, considering urban empty spaces as privileged spaces for the change of our social metabolism and habitability.