Using the Building Noise Map of CadnaA these calculations can be performed without problems. With the first step the circular building evaluation symbol is attached to all residential buildings - this can be done for all buildings in the project or in a defined area in one step. During calculation the noise indicators are determined around the facades of all buildings with the building evaluation symbol. Inside the symbol the largest value of L_den and L_n of all these facade points is shown. Additionally for each building the lowermost noise indicators are known and can be used in further evaluations (e.g. to decide about the existence of a relatively quiet facade).