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Does air conditioning require planning permission?

I want to install an external air conditioning unit in my back garden on the boundary wall rather than on the house itself. I live in an end of terrace house with a public footpath running up the side of the house. The wall of my house continues as the boundary wall between my back garden and the public footpath and it is on this wall that I want to attach the air conditioning unit.

Not sure if this bit is relevant: The footpath is about a metre higher than my ground floor and back garden, the boundary wall is about a metre high; the level of the footpath is at the top of the wall and there are wooden fence panels on top of the wall to form the boundary to my property from the footpath. I think my brick wall also functions as a retaining wall for the footpath and properties on the other side of the path which are at the same grade as the footpath.

My intention is to mount the air conditioning unit on this metre high wall so it would be close to the ground, facing into my back garden and at the corner of where the wall meets the house, and would be below the level of my windows.

Do I need planning permission to do this or is it permitted development?

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