There is normally quite a large gap between any window and the surrounding masonry! This is often covered by means of a wood window lining, which covers the gaps and is normally finished with decorative wood, such as architrave.

Today this gap, known as a reveal is often covered with plasterboard and gives the impression of a larger room. Wood can be used to make the gap between the masonry and the window small enough for one piece of plasterboard but here we have chosen a method which also uses up spare pieces of plasterboard.