This paper describes the work performed within the URB-Grade project. The URB-Grade project designs, develops and validates a Platform for Decision Support that will allow the city authorities and utilities to promote and choose the correct actions. This will allow upgrading a district to become more energy efficient, cost effective and to increase comfort for its citizens in a District as a Service Platform (DaaS Platform) approach. This paper describes the methodology taken to specify the variables that affect the energy consumption of a district and the actions to reduce them, the global architecture of the platform based on the Service Oriented Architecture paradigm, and the impact that the use of the tool intends to achieve.