Have an existing bathroom with sink. Want to put in a toilet. This entails 2.5 meters of plastic pipe to connect to the existing sewer drain which already runs down the outside of my property. The new pipe will be on the exterior of the property not seen by anyone as the nearest property is behind trees and approx 30 + meters away. Their gable end has a small window for their toilet which is the only window.
Would I require any form of planning?