> For the complete documentation index, see [llms.txt](https://docs.betterbuilding.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.betterbuilding.io/user-guide/2d-building/drawing/set-a-zone-height.md).
# Set a Zone Height
Zones represent thermal spaces within your model, whether they’re air-conditioned or not. All zones on the same drawing share the same height and are drawn to their required dimensions. Zones should be set up right after creating the first one.
## Set Single Zone Height
Go to the admin area in the drawing space and click on the default ‘Storey Height’. Enter the new height for your zones (in mm), then click ‘Update’ and ‘Save’.
Important: Set the zone height before adding any windows. Changing it afterwards may cause window-wall clashes, which will result in the windows being removed automatically
## Setting Multiple Zone Heights
If your design requires different heights, you can combine zones into single volumes by applying air-floors, allowing you to model multi-height spaces accurately.
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