The Combined Nomenclature (CN), v1:2024
9406 90 90: Prefabricated buildings, whether or not complete or already assembled (excl. mobile homes and those made entirely or mainly of wood, iron or steel)
https://www.dst.dk/en/Statistik/dokumentation/nomenklaturer/kn?id=ff35b666-b08b-41b5-bea1-78e213f89ca8