The Digital Inventory for Swiss Construction Systems is a database structure that provides detailed information on component attributes in as-built load-bearing and insulating layers of existing buildings. The first version of the dataset provides granular data for 102 buildings in Switzerland, each digitalised into a building information model and parameterised using a custom library of 78 attributes. This version of the database was developed by the Structural Xploration Lab (SXL, https://sxl.epfl.ch) at the École Polytechnique Fédérale de Lausanne (EPFL). The authors would like to thank all the building owners (private and public) for providing access to building data. We thank the EPFL students that contributed in processing the raw data and Maxence Grangeot and Xavier Estrella from SXL, EPFL, for their assistance in extracting the data from the 3D models.