ReplaceSmart specializes in windows and patio doors. Our vinyl windows come with a vinyl interior in white, beige or multiple wood grain options. Do it yourselfers can buy windows online for very low prices. For homeowners wanting installation, ReplaceSmart offers in home installation estimates through its partner independent contractors. ReplaceSmart supplies double hung windows, sliding windows, casement windows, picture windows, garden windows, bow windows, bay windows, special shapes and sliding patio doors.