Capitall Windows is Ottawa-based Window Installation Ottawa. The owners have been in the window & door sales and installation business for over 15 years. Capitall Windows is a fully licensed & accredited business with highly competitive prices and very professional window & door installers. All of our windows & Doors Ottawa are 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. Capitall 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 watertight seal.