Abstract: The corner cover for a trim member of a building wall siding or cladding may have first and second panels each with opposed substantially planar faces inclined at an included substantially right angle to each other with a longitudinally extending vertex. Each panel may have a substantially linear bottom end extending substantially perpendicular to the longitudinal vertex. The lower portion of each panel may have a first edge portion spaced from and extending substantially parallel to the longitudinally extending vertex and an upper portion with a second outer edge portion at least in part spaced from and closer to the longitudinally extending vertex than the first edge portion and at least in part may be inclined to both the bottom and first edge portions of its associated panel.