We are looking at extending at the rear of our house. Currently the kitchen is only have to width of the house and we want to build across so the back of the house will still be in the same place, just wider IYSWIM. A builder friend suggested we build a two storey extension as it would be cost effective and add value as we could have an extra bedroom. The house is a three storey terrace so buildings second storey extension would not increase the roof height. Dimension of the second floor extension would be 3m x 3m. I've looked at the council website and it sounds to me like this is ok without PP but I'm worried I've read it wrong. Any experts out there?