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In recent years, due to human development, energy demands worldwide have increased. From 2021, the demand for energy has increased sharply as a result of the recession during the pandemic followed by necessity to restart the economy (International Energy Agency, 2021). Recent events such as the war in Ukraine have brought us face to face with an energy crisis, which has affected the whole Europe, and consequently Greece as well. Therefore, we have to reduce the demand for energy from every aspect of our daily lives. This has led states to start working systematically to upgrade all infrastructure and buildings. Energy upgrading of buildings is not a new topic. However, a great deal of effort is needed in order to achieve the targets for nearly zero energy buildings (nZEB). The aim of this paper is to present the current situation in Greece regarding energy upgrading of buildings (legislation, EU directives and Energy upgrading programs). Then, the barriers presented in the international literature for the upgrading of buildings are summarized. Finally, using questionnaires addressed to multiple engineers, technicians and buildings’ owners, and then using the Best Worst Method (BWM), a multi-criteria analysis method developed at TU Delft by Dr. Jafar Rezaei, 2015, a ranking of these barriers in terms of importance is carried out. This presents a clearer picture of the barriers that the state should focus on and resolve. At the same time, relevant proposals will be made towards the achievement of national targets for the energy efficiency of buildings.