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The aim of this dissertation will be the investigation of the impact of different definitions of Zero Energy Buildings, on achieving the ZEB goals. The contribution of this study is to examine five public buildings in Kalamaria, which are all two storey buildings, built before 1955. For each an energy performance audit will be done and results will be the output of the TEE-KENAK software. Discussion on the results and assessment will draw conclusions. Depending on the bibliography and lessons learned from other case studies all over the world, this study concentrates to the Greek special conditions and sets the specifications of reaching the ZEB goals in the context of national limitations. When specifying to old buildings stock, more limitations are set, which are also taken under consideration. Understanding the energy performance of the current stock of buildings is an important step toward reaching the ZEB goal. The buildings included in this study are: 1. The municipality central offices building (restored) 2. The cultural organization building (restored) 3. A primary education school building 4. A social services, disabled school and library building 5. A social services offices and nursery building