Capital Windows is Ottawa based window and door installation company. The owners have been in the window & door sales and installation business for over 15 years. Capital Windows is one of the Ottawa valley windows and doors fully licensed & accredited businesses with highly competitive prices and very professional window & door installers. All of our Windows Doors Ottawa is from top-quality North American manufacturers. We can offer your home an architectural design that delivers not only full energy efficiency but also absolute beauty. From sliders to casements, we offer a wide range of colors and styles that will compliment any home. Capital Windows Ottawa will reduce your energy costs for years to come, because all window frames & sashes are fusion welded for strength, providing a permanent air and water-tight seal.