Hi everyone I’m new to this site and amazed with the amount of help and support that’s out there! Anyway I’m looking for a bit of advice – I currently have a double storey extension that faces out to the rear of my property. This has a flat roof but I’m looking to replace this with double pitch roof. I’m planning to run the ridge of each pitch to below the level of the original house ridge. Also I’m looking to vault the ceilings internally and put some roof windows in. Does anyone know if I’ll need planning permission as I was hoping to kick-start the project ASAP.