|To mark number of levels above ground level|
|Used on these elements|
|Status: de facto|
|Tools for this tag|
The building:levels tag is used for marking the number of above-ground levels of a building (building=*) or part of a building (building:part=*). The underground levels and the roof do not count as levels here. However, levels that are part-way underground do count (see example below). For the purposes of this tag, "ground level" is defined to be the lowest entrance to a building.
- B + C + D counts as building:levels=3
- E counts as building:levels:underground=1
- A counts as roof:levels=1
Buildings with parts that don't start at ground level
If a building part does not start at the ground level, building:levels=* should include the number of skipped levels below the building part (i.e the number of levels that would exist if the space between the ground and the bottom of the building part were filled with levels of the typical height for this building). The key building:min_level=* should be used to describe the number of skipped levels in this building part.
See Simple 3D Buildings for more information.