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ghostface
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?