Hi all, I'm living in a housing estate( a house each side of me) & my rear garden fence is nearly down because of the recent bad weather.there is nothing behind the fence except a small bit of waste land,a river & on the other side,the rear of some houses.my current fence is approx 6ft in height.just wondering if anyone knows whether or not there are any issues with replacing this fence with a block wall of the same height?is planning permission required?