In reply to paul_in_cumbria:
> I’m in the middle of building a summer house, the restrictions are the same..
> Your build is not located on land forward of a wall forming the principal elevation – not in front of your house.
> • The build is single storey with a maximum eaves height of 2.5 metres and a maximum overall height of 4 metres if it has a dual-pitched roof, or 3 metres in any other case.
> • If the build is located within 2 metres
> of the property’s boundary, the entire building is not more than 2.5 metres high.
> • The build has no veranda or balcony. Raised platforms such as decking should be no higher than 30cm from ground level
> There’s an additional restriction that you need permission to build a structure at the side of your house in a National Park or AONB/conservation area
> so, if it’s closer than 2m to a boundary, max height of 2.5m. Further away, then it’s either 3m or 4m depending on structure. 3m is safe in any case. If you build 4m, and someone complains, then it’s down to whether the planning inspector deems your structure to have a dual-pitched roof.
> This information is all over the internet and on planning portals.
I think this is regarding a permanent construction. If you can convince them it's a temporary, moveable constructive you can get away with more. Perhaps make it with a folding top and freestanding and I think you might be able to circumnavigate some of the restrictions. As long as you can remove the top section in a reasonable fashion, you don't have to do so regularly, just demonstrate that you can? A tilting wall would obviously reduce the height and so you could have it 4m at 15 degrees but substantially less, perhaps 3, at 45 degrees.