The paper presents the results of the annual computational simulations conducted for the W70 panel building. The calculations were carried out in the Design Builder program which allows preparing the simulation of the building envelope as well as the separate parts of the building interior. It is very rare to considerate the requirements connected to the overheating effect in the panel buildings. This issue is closely related to the thermal comfort in the building, especially during the summer months. Based on the conducted simulations, authors indicated the influence of building orientation, individual flat location and thermal insulation on the thermal comfort in the different flats of prefabricated panel building.