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The perspective that has been set, has as a clear goal to reach and exceed the energy savings in buildings of 20%. Thus, the European Union has put in place a regulatory framework to ensure its achievement. The technology of "smart" materials is developing rapidly and has significant applications in the field of energy saving. The purpose of this paper is to describe the functional and regulatory framework adopted for energy saving in buildings and "smart" materials, in order to identify all possible parameters for their enrichment. Also, the trends and perspectives of the Greek market of "smart" materials used for energy saving in buildings through detailed research are investigated, in order to identify the factors that can promote, or that may prevent their use in the construction sector. . The work refers to the identification of smart buildings around the world, their recording, their mode of operation, the reference to the mechanisms that classify them in this category, as well as their advantages and disadvantages compared to buildings that are not mentioned as “ smart ”. Then there are reports of various buildings in the Greek territory that are part of the smart constructions and what they offer to the general area. Concluding, a special reference is made to the smart building of the Region of Central Macedonia, focusing on the way in which energy savings are achieved to a greater extent compared to other constructions. In conclusion, after recording the positive and negative elements of this building, there are ways to upgrade the energy of an already smart building, as well as the cost of creating and maintaining or self-preserving such an investment.