| Site occupancy index | | (GRZ) | |
The site occupancy or building area index (in German: Grundflächenzahl or GRZ) specifies
how many square metres of base area are permissible per square metre of land. The
permissible building area is thus the proportion of the real estate that can be covered
by buildings.
(According to §19 of the German Land Utilisation Ordinance or BauNVO)
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| Floor space index | | (GFZ) | |
The floor space or storey area index (in German: Geschossflächenzahl or GFZ) specifies
how many square metres of floor space are permissible. The floor space is determined
according to the external dimensions of the building in all its storeys with full extent.
(According to §20 of the German Land Utilisation Ordinance or BauNVO)
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| Cubic index | | (BMZ) | |
The cubic or building mass index (in German: Baumassenzahl or BMZ) specifies how many
cubic metres of total structural volume are permissible per square metre of land area.
The building mass is determined according to the external dimensions of the building.
(According to §21 of the German Land Utilisation Ordinance or BauNVO)
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