The invention relates a method for making a window, where the sash is connected to the frame by a pair of hinges, each comprising a first hinge part connected to the sash and a second hinge part connected to the frame. The sash is made from a plastic material by molding, and that one or more functional elements are attached to the sash during the molding thereof. The functional elements can include a stay arm having a base member, which is attached to the sash bottom member, and the first hinge parts. Also, the frame may be made by molding.