The temporary rules that allowed larger single-storey rear extensions to be built without planning permission have now been made permanent. Previously, single-storey rear extensions could not extend by more than four metres for a detached house and three metres for any other house. This has permanently increased to double that and is now eight metres for a detached house and six metres for any other house. These larger extensions are still subject to the neighbour consultation scheme, so homeowners must notify the local authority who will consult neighbours who can raise objections if they wish and the local authority will review. Read more from the Planning Portal.