Abstract: Window trim designs are disclosed for use in commercial and residential building construction and repair. Brick mold, flat trim, and sill nose designs are disclosed, each having a similar structural arrangement configured to correspond with receiving structures of a window frame, and to lock and seal the trim to the window frame. Each design has a co-extruded flexible seal that engages the associated window frame member to shed water due to rain, etc. A secondary caulk/gasket seal is also provided between the trim and window frame. The external surfaces of the trim designs are embossed to mimic the appearance of wood. The trim designs may be cut, mitered and joined to provide a “picture frame” trim appearance. Alternatively, the provision of a sill profile allows the assembly of a more traditional window trimming appearance, with brick mold or flat trim on three sides, and sill member on the bottom.