The conversion of basement rooms for residential purposes may require planning permission. This is emphasized by the Association of Private Builders (VPB). This is because it is a so-called change of use if homeowners want to turn their basement storage room into a separate apartment. In most cases, this change requires official approval.
The respective state building regulations set out specific requirements for such conversions. For example, they determine the minimum height of the rooms and ensure that there is sufficient light and air. In addition, fire protection regulations and the Energy Saving Ordinance must be observed.
The VPB strongly advises homeowners to enquire in advance with the local building authority about the feasibility and the corresponding requirements. Only when all conditions and guidelines have been clarified should the detailed planning and financing of the project take place.source: VPB
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