We often receive questions as to whether flat entrance doors must have a door closer. The building regulations regulate this issue.
In the attached table I provide a compilation and detailed sources - as always: without guarantee - the information should always be checked before using it.
The table can be downloaded from the download area of www.tpo-holz.de:
https://www.tpo-holz.de/wp-content/uploads/2020/09/Wohnungseingangstüren_Übersichtstabelle.pdf