About to (well..hopefully) build a single storey rear extension within allowed spec.
Now as far as I'm aware I have to give notice to neighbours if the extension is within 3 metres of their property. In my case my neighbour's property is actually offset by at least 4 metres - i.e. his house is much further forward to the street. But at the same time we do share a wall which I presume is shared along the entire length of both properties.
Is anyone aware where I stand in this case? Does the 3 metre rule apply to their main building or simply to the party wall.