I have a very long wall that starts off at around 4m and decreases in steps to 2.8m to accomodate our new extension we need to raise the 2,m part of the wall. As the first part of the wall is 4m already do we need planning permission to level it all? The "neighbour" he otherside is a car park of a restaurant so if anything I think they'd be glad we were prucing up the rather tired wall! The owner has no objections to us raising the wall. Can anyone advise? thanks