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Does this mean I can have a flat roof of 3m, or does it need to be 3m to 2.5m pitched. I'm reading the later but some sources indicate the former.
Pretty much! But each local authority reads permitted development differently so if you want to see what you can get away with just submit a "lawful development" planning application for like £60/70 and they will either grant it lawful or refuse it.
It is if it is within 2m of the boundary. You're allowed 3m if you're more than 2m from the boundary. Although I do find the wording ambiguous
"Outbuildings must be single storey with a maximum eaves height of 2.5 metres and maximum overall height of 4 metres with a dual pitched roof, or 3 metres in any other case.
If the outbuilding is within 2 metres of the property boundary the whole building should not exceed 2.5 metres in height."
Does this mean I can have a flat roof of 3m, or does it need to be 3m to 2.5m pitched. I'm reading the later but some sources indicate the former.