Öz
In this study, the impact of the Building Information Modeling (BIM) applications on the energy performance of the buildings has been revealed with an application study upon the lifecycle cost and CO2 emission values. With this purpose, a comparison has been conducted with the Building Information Modeling applications for the alternative status of the building determined according to the variables such as the current location of the building, orientation, southern facade transparency ratio and the outer wall insulation material and thickness.In this respect; the lifecycle cost being 62810 USD in the current state has been attained as 46574 USD for the formed alternative state. CO2 emission values attained for the fuel consumption have been respectively 6.2 Mg and 3.3 Mg for the current and alternative states. Consequently; the fact that the energy performances of the buildings could be enhanced using the BIM based programs for an applied building or a building that is at the design stage and the environmental impact to be provided in this way have been concretely revealed.