A method (10) for interactive estimation of construction costs for a building or property values comprises a step of inputting an input size of the building in a system, wherein the input of the input size a data entry (2) comprises. The data entry corresponds to a selected building configuration, wherein selected building configuration is displayed on a user device. The system includes a controller, wherein by operating the controller changing the selected building configuration on the user equipment takes place, so that a data adjusting (3) takes place, wherein the actuation of the controller is continued, to the selected building configuration corresponding to a desired building configuration, wherein building an analysis for the desired configuration (4) is carried out, the construction costs or property values for the desired building configuration value.