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Typically, during design stage of a single-family house, only initial costs are taken into account, which are also discussed with the customer and optimized with the aim of reducing them. Long-term calculations are usually not made. At the same time, the calculation of global costs to design, build and operate the building show the real difference in expenses while living in this house. In the case of nZEB building the global cost approach becomes especially useful because of the strict energy demand requirements ...