The recovery and requalification of built heritage are, in Europe and all over the world, a central issue in relation to current international policies. In recent years, there has been a considerable growth in research within this field, favoring the implementation of intervention methodologies in the real estate assets of public and private property. With this study, we intend to focus attention on the redevelopment of existing school buildings, taking into account, from an integrated perspective, different aspects related to energy and environmental retrofit, the improvement of seismic safety, and socio-economic assessments. A significant impact of the study that was carried out will be favoring the more disadvantaged classes and a reduction in school drop-out, which in some cases is caused by the decentralized dislocation of the complexes or by inadequate structures. The research consists of the development of a tool to support the planning and programming of interventions for school building modernization, with a view to environmental, economic, and social sustainability. In order to take into account the multiplicity of the aspects considered, among the methods of multi-criteria analysis for decision-making aims the Analytic Hierarchy Process (AHP) method was applied, which allowed us to analyze and compare different alternatives through evaluation criteria, reaching the definition of a priority scale. This process makes it possible to identify those interventions that achieve the best compromise between community needs and the planners’ goals. The evaluation procedure is validated through the application on a concrete case study, which is a school building located in the province of Avellino, in the south of Italy.

Buildings in Europe are the largest consumers of energy, since they are responsible for 40% of energy consumption and 36% of pollutant gas emissions. The energy efficiency, the consequential economic savings and the reduction of environmental impacts must necessarily consider the design of improvements that affect the opaque vertical envelope of a building. The vertical envelope generally constitutes the largest dispersing surface. In this paper, a comparative evaluation of different ETICS (External Thermal Insulation Composite System) solutions through the application of a multicriteria decision support method is proposed. The criteria at the basis of the procedure relate to the energy, environmental, indoor comfort, and economic aspects. Through the application to the case study, consisting of two types of vertical walls with reference to three different climate zones, the ETICS alternative that achieves the best compromise between the various evaluation criteria is highlighted and the solidity of the method itself is tested. The potential of the methodology in the analysis of the alternatives in adherence to individual subcriteria and the possibility of implementation with additional indicators as the needs change are also highlighted. The social impact is undoubtedly one of the expected effects of the application of the method, since a better performance of the building envelope leads to an increase in comfort and liveability of indoor spaces. Moreover, all studies aimed at increasing the performance of the building or parts of it, consequently, lead to greater accessibility by the most vulnerable members of society, in line with the principles of sustainability and inclusiveness of the United Nations 2030 Agenda.