Key:building:floor_area

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Public-images-osm logo.svg building:floor_area
Description
Sum of all the floor areas on a building, by default in square meters
Group: buildings
Used on these elements
should not be used on nodesshould not be used on waysmay be used on areas (and multipolygon relations)may be used on relations
Requires

building=* or building:part=*

Status: de facto

A building:floor_area=* tag key is used to define the total floor area (sum of floor areas on the whole building) and serves to analyze space available inside a building. By default, it is in squared meters. This is most of the time different from building area, since it will include the space available on each floor and should substract holes and split-level empty spaces from the total.