Waste material is residual of the material that can't be used anymore. Often planning estimates of waste is not same with the actual waste on site become the creation of ideas in this study regarding waste steel profile. In previous studies have focused on natural materials making can be done in the field or cast in situ. This research focused on four types of steel buildings include warehouses, airports, towers, bridges with each describing the type of profile wf, pipe, angle bar, plate. The research method is to calculate the percentage of waste by calculating the difference between the gross weight minus the net weight is then divided by gross weight. The gross weight is obtained from the calculation of material needs by drawing the structure, while the net weight obtained from the 3D modeling. The percentage of waste is then analyzed regression to obtain the factors causing waste. The result of data processing shows that the smallest percentage of waste is a type of tower building with angled profile by 5.71%, warehouse with wf profile for 9,36%, the airport building with pipe profile of 13.85%, building bridges with the profile plate by 19,08%. Causing factor of waste is type of profile and building dimension consists of height, wide, and length of building.