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You do not usually need to apply for planning permission for:
repairs, maintenance, and minor improvements, such as repainting window and door frames
insertion of new windows and doors that are of a similar appearance to those used in the construction of the house (note - a new bay window will be treated as an extension and may require permission). If new windows are in an upper-floor side elevation they must be obscure-glazed and either non opening or more than 1.7 metres above the floor level.Ref: https://www.planningportal.co.uk/info/200130/common_projects/14/doors_and_windows
I live in an end of terrace house, and I'd like to put a small bathroom (so frosted) window in the end. Next door is a block of flats. Anyone know if I'd need any planning permissions to do this (wondering if I need to be worried about people in the flats feeling overlooked or anything like that)