A frame for a window intended to serve either as a stationary frame or as a sash frame according to the invention comprises an insulating abutment list on a side surface of at least one of the top, bottom or side members intended to face a side surface of another frame of the window. The insulating abutment list is made from a material having a thermal conductivity of less than 0.08 W/(m·k), preferably less than 0.04 W/(m·K). Preferred materials for the insulating abutment list are expanded polystyrene (EPS) or extruded polystyrene (XPS). In a window with such a frame, an insulating abutment list on the sash frame preferably extends from hinge part to the bottom member of the sash frame and an insulating abutment list on the stationary frame preferably extends from a hinge part to the top member of the stationary frame.