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Energy consumption in school buildings and improving their energy efficiency is an important research issue. This study aims to investigate the energy behaviour of school buildings in Greece, based on their date of construction and technical characteristics, before and after the implementation of various bioclimatic intervention scenarios on them and the subsequent estimation of their cost according to their typology. The method followed is the research and collection of data on the evolution of school buildings over time and their classification into three categories, to determine the most representative in regards to their time period and their technical characteristics. Based on this standardization, their energy situation is assessed with the program of TEE-KENAK and the implementation of the Technical Instructions TOTEE / 2017. Then, scenarios regarding bioclimatic passive interventions in the shell of the buildings and in their electromechanical installation are applied and their energy efficiency is investigated, which improves significantly, especially in older buildings, with a respective reduction in their energy consumption. Finally, the cost of these interventions is calculated, depending on the category of the building and the type of intervention.

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The new energy crisis, caused by the current geopolitical destabilization, has made the need to limit our energy consumption more urgent than ever. As the construction industry is widely known to be one of the most energy consuming sectors, this study aims to investigate the influence of construction professionals in implementing sustainable construction strategies, increasing the construction of sustainable buildings and infrastructure, and promoting sustainable investments. The survey was conducted using a questionnaire, addressed mainly to engineers, to investigate their willingness and motivation to enhance the design and construction of sustainable buildings and infrastructure and to promote and expand the use of renewable energy sources. The results of the study showed that almost the vast majority of engineers who participated in the survey use or recommend the use of green materials in their projects. Their motivations are mainly environmental, such as mitigating hazardous air pollutants, also, socially, such as providing healthy living conditions and finally financial, as residents save resources by saving energy. However, a significant number of participants believe that the construction cost of a sustainable building is much higher than the cost of a conventional one and see it as a deterrent reason for involvement.