Can my neighbour build an extension or conservatory without planning permission?
In most cases, if the property is a single dwellinghouse (and not flats) then your neighbour may erect an extension (including a conservatory) without planning permission, However, although some of the size limitations are explained below, given the complexity of the legislation and the fact that some developments have conditions which remove permitted development rights, you can seek confirmation by contacting Planning Services or visiting the Planning Portal website. If the property is within a conservation area or is a terraced house, the total volume of the extension(s) must not exceed 50 cubic metres, or 10 percent of the original dwellinghouse, whichever is the greater. In any other case, the total volume of the extension(s) must not exceed 70 cubic metres, or 15 percent of the original dwellinghouse, whichever is the greater. This volume is the total allowed for all extensions on the property, therefore the volume of any other extensions, including roof extensions, should be sub
