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The aim of this case study was to evaluate the energy performance of utilizing different external materials reaching sustainable targets. Buildings are responsible for 40 percent of energy consumption and energy performance of buildings is a key element to achieving the European Unions goals. The EU has pledged to cut its consumption by 20 percent by 2020. The main objective of this research was to explore the suitability of BIM for sustainabil-ity analysis at the conceptual design process. The procedure included analysis and discussion of the results for the lowest energy performance of materials. It was shown that changing the building envelope had a signi cant e ect on the annual energy performance of the case building. The limitations of the study was the limitations in the software. For further research, the paper nds it expedient to perform a even more detailed simuation analysis on the building design with other energy supply systems. The value of the paper is to highlight the utilization of BIM to evaluate the material solutions to reach sustainable construction in the future, focusing on the need for lowering the energy consumption of tomorrows buildings.

BIM based iterative simulation - efficient building design: a case study