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For the building, maximum height of 2.5 metres in the case of a building, enclosure or container within two metres of a boundary of the curtilage of the dwelling house for it to qualify for permitted development rather than planning permission.
Not sure about the requirement to get planning for replacing the back wall, the neighbour to the top left seems to have their building right up to the wall.
Will you keep an access door to the alley and relocate it?
I want to build a workshop/garden studio here that adheres to the rules of permitted development. Rather than build it set in from the rear and party wall (thus losing space behind and to the RHS) I’m wondering about whether I could use the rear and party wall as two of the four walls of the workshop. They would need rebuilding as the current walls are crap. How complicated is this likely to be logistically in terms of paperwork? I’m guessing I’d need a party wall agreement and possibly planning permission from the council for changing the rear wall? There is a small service alley behind that the bin lorry uses and also there is a telegraph pole set just behind our wall which complicates things too. If it is too much hassle we will just set in in with a small alley behind but we’re keen to maximise space