Height
Height (for example, the heights of the eaves on a house extension) refers to: ‘…the height measured from ground level. (Note, ground level is the surface of the ground immediately adjacent to the building in question, and would not include any addition laid on top of the ground such as decking. Where ground level is not uniform (for example if the ground is sloping), then the ground level is the highest part of the surface of the ground next to the building.)
Ref Ministry of Housing, Communities and Local Government, Permitted development rights for householders, Technical Guidance, September 2019.
See also: Working at height.
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