Sustainable urban renovation is characterized by multiple factors (e.g. technical, socio-economic, environmental and ethical perspectives), different spatial scales and a number of administrative structures that should address the evaluation of alternative scenarios or solutions. This defines a complex decision problem that includes different stakeholders where several aspects need to be considered simultaneously. In spite of the knowledge and experiences during the recent years, there is a need of methods that lead the decision-making processes.In response, a methodology based on the global idea and implications of working towards a more sustainable and energy efficient cities as a holistic procedure for urban renovation at district level is proposed in the European Smart City project CITyFiED. The methodology has the energy efficiency as main pillar and the local authorities as client. It is composed of seven phases that ensures an effective dialogue among all the stakeholders, aiming to understand the objectives and needs of the city to define a set of Strategies for Sustainable Urban Renovation and their integration within the Strategic Urban Planning of the cities.

The urban growth is estimated to reach up the 66 % by 2050 and consequently the need of resources within the cities will increase significantly. This, combined with the 40 % of energy consumption and 36 % of CO2 emissions of the building sector, makes necessary to accelerate the transition towards more sustainable cities. The CITyFiED project contributes to this transition, aiming to develop an innovative and holistic methodological approach for energy-efficient district renovation and deliver three large scale demonstration cases in the cities of Lund (Sweden), Laguna de Duero (Spain) and Soma (Turkey). CITyFiED methodology consists of several phases that ease the decision-making tasks towards the district renovation, considering the energy efficiency as the main pillar and local authorities as clients. For the case of Torrelago district (Spain) the intervention consists of a set of energy conservative measures including the façade retrofitting of 143.025 m2 of living space in 31 twelve-storey buildings; the renovation of the district heating network with a new biomass thermal plant; the integration of renewable energy sources, including a micro-cogeneration system, and the installation of individual smart meters. After the renovation action, one-year monitoring campaign is ongoing. The CITyFiED monitoring platform will collect information from the energy systems and deliver environmental, technical, economic and social key performance indicators by March 2019. At the end of the project the achievement of the predefined goals will be verified: up to 36 % of energy saving and 3,429 tons-CO2/yr emissions saving covering the 59,4 % of the energy consumption with renewable sources

Sustainable urban renovation is characterized by multiple factors (e.g., technical, socioeconomic, environmental and ethical perspectives), different spatial scales and a number of administrative structures that should address the evaluation of alternative scenarios or solutions. This defines a complex decision problem that includes different stakeholders where several aspects need to be considered simultaneously. In spite of the knowledge and experiences during the recent years, there is a need of methods that lead the decision-making processes. In response, a methodology based on a KPI-driven approach for urban renovation at district level is proposed in the European Smart City project CITyFiED. The methodology is a procedure with the energy efficiency as main pillar and the local authorities as client. It is composed of seven phases that ensures an effective dialogue among all the stakeholders, aiming to understand the objectives and needs of the city to deliver a set of customized Strategies for Sustainable Urban Renovation. In order to provide guidance and quantitative criteria, three levels of indicators are integrated into the approach: City Level Indicators (L1) at city & district level, Project Level KPIs (L2), and Impact Assessment Indicators at city level (L3).

The objective of the CITyFiED Methodology is to support city authorities along the process of working towards a more sustainable and energy efficient cities. Moreover, it encourage the replicability and mass market deployment of energy efficient retrofit of districts, considering as a reference the CITyFiED demonstration actions, decision-making processes and business models. The CITyFiED Methodology is a procedure composed of several phases and a management process that aims to ease the decision-making tasks and what is more, the delivery of a specific plan for each city depending on its needs, vision and objectives. A customized Strategy for the Sustainable Urban Renovation (SSUR) at district level with the energy efficiency as the main pillar and local authorities as clients, will be delivered based on the objectives and needs identified during the analysis and diagnosis phases. The management process is supported by the creation of an External Consultancy Group (ECG) to collaborate with the local authorities, and by providing different tools and indicators that would enable the assessment of the suggested actions (Strategy for Sustainable Urban Renovation) as the comparison with the original situation and objectives. The Methodology is conceived within the context of the CITyFiED project and it considers as reference the three large demonstration actions that include building renovation, district heating networks, integration of renewable energy sources and monitoring, and which are located in Lund (Sweden), Laguna de Duero (Spain) and Soma (Turkey).