The first part of this diploma thesis is to design an energy-efficient hotel with restaurant and car parking. The second part is also to create an assessment of the energy performance of the building and usage of energy from renewable sources. Hotel is designed with the idea of „smart buildings“ which means, that all the technological background is controlled by the main computer, which also harvests data to achieve a minimum energy use and financial demand and maximum comfort and safety at the same time by controlling the connected technology. By placing on a sloped terrain in the center of Brno, the basement floor can be used as car parking. The roof of this building is flat, green, with modifications for placing solar panels, whose design is part of this work. The third part of this diploma thesis is the spatial acoustics of the conference room on the first ground floor.