The federal governments of Germany endeavour to create a harmonized 3D building data set based on a common application schema (the AdV-CityGML-Profile). In a joint research project, the Bavarian Agency for Digitisation, High-Speed Internet and Surveying and the TUM, Chair of Geoinformatics, transformed an AdV-CityGML-Profile based test data set of Bavarian LoD2 building models into an INSPIRE-compliant schema. For the purpose of a transformation of such kind, the AdV provides the data specification, a test plan for 3D building models and a mapping table. The research project examined whether the transformation rules defined in the mapping table were unambiguous and sufficient for implementing a transformation of LoD2 data based on the AdV-CityGML-Profile into the INSPIRE schema. The proof of concept was carried out by transforming production data of the Bavarian 3D building model in LoD2 into the INSPIRE BU schema. In order to assure the quality of the data to be transformed the test specifications according to the test plan for 3D building models of the AdV were carried out. The AdV mapping table was checked for completeness and correctness and amendments were made accordingly.