> 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/building/shading/create-site-shading.md).
# Create Site Shading
An Extruded Form could be an individual shading device, an internal shading element (e.g. furniture) or an adjacent building.
## Add Extruded Form
To add an Extruded Form, navigate to the Shading (under Building), then locate the 'Add Horizontal Shading' icon. Next, draw the proposed surface of the Extruded Form. Now, select the surface, and then select 'Options' in the left tab. Set the 'Extrusion' height. You can also set the 'Base Height', the height at which shading starts from ground level and the 'Opacity', where 0% is completely transparent. Click 'Save and Close' and then navigate to the [3D View](/user-guide/2d-building/drawing/3d-view.md) to see the new shading.
## Customise a Shading Surface
To add a 'Shading Surface', first find a previously drawn 'Horizontal Shading' element. Select it, then go to the 'Surface' tab. From there, you can set the surface using the same tool as a roof design.
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