Generation of a building information model

A system for generating a building information model for working on a building, comprising:

• an interface that is set up in such a way as to read in a two-dimensional building plan of the building, wherein the two-dimensional building plan comprises building objects and building object data assigned to the building objects,
• a scanning unit that is set up in such a way as to acquire three-dimensional building data of at least a part of the building,
• a comparison unit that is set up in such a way as to compare the three-dimensional building data with the building plan, wherein at least a subregion of the building plan at the position of the scanning unit is evaluated, and to output comparison data,
• a detection unit that is set up in such a way as to detect at least one building object in the building plan based on the comparison data and to output building object data assigned to the detected building object,
• a model generator that is set up in such a way as to generate the building information model from the three-dimensional building data,
• an integration unit that is set up in such a way as to integrate the detected building object and the assigned building object data into the building information model,
• and
• an output unit that is set up in such a way as to output the generated building information model in order to work on the building.