Certified Window Co. offers premium vinyl replacement window installation for Fairfax, VA and the surrounding areas...

When you call Certified Window Co., you deal directly with owner James Ragusa.

With almost 40 years of industry experience, Jim understands that replacing your windows can be a big decision, so he never uses high-pressure sales tactics that leave you feeling like you rushed into something. At Certified Window Co., we offer discount replacement vinyl windows. We let the quality of our work, the broad range of options to fit every style and budget and, of course, our low wholesale pricing speak for themselves.

Certified Window Co. is based in Fairfax County Virginia and offers vinyl replacement window installation for Northern Virginia including Fairfax, Sterling, Ashburn, Falls Church, Herndon, Reston, Springfield, Alexandria, and Annandale VA. We offer wholesale new and replacement vinyl windows that are energy efficient.

If you have been considering the move to more energy-efficient, vinyl replacement windows we can improve your home’s look and feel while reducing your energy bills.

Certified Window Co. is based in Fairfax County Virginia and serves Northern Virginia including Arlington County, Montgomery County, Prince Georges County and Howard County. We offer new and replacement insulated vinyl windows that are energy efficient.

Whether you are remodeling, renovating or building a new home, Certified Window Co. will deliver unmatched beauty, strength and energy savings. Our windows are custom-made to fit your current window openings precisely and you save money because unlike stock windows found at your local retailer, they require no additional wall construction.

Best of all, New vinyl windows elegantly complement the style of your home; whether it’s traditional or contemporary, there’s a model to fit your specific style, performance and budget needs.  Our energy efficient vinyl windows come in double pane and triple pane.

We take a great deal of pride in the quality of our new house windows and the quality of our installations. We have a large variety of window styles that can fit any home.

For the best selection of wholesale vinyl windows in Maryland, DC, and Virginia, choose Certified Window Co.

We are the energy efficient windows replacement window experts ready to help you find vinyl windows that suit your home and your budget.

Fusion™ and Mezzo® Energy-Efficient Vinyl Windows are built for the way you live. Featuring fusion-welded sashes and mainframe, multi-chambered extrusions, composite-reinforced interlocking meeting rails and an insulating glass unit, Fusion™ and Mezzo® Windows by Alside provide the reliable quality you deserve without the burden of time consuming cleaning and upkeep.

Attractive, protective and energy smart, the Fusion™ and Mezzo® Windows are a cost-effective solution to lower your heating and cooling bills. Plus, the Lifetime Limited Warranty* delivers the peace of mind you would expect from a respected industry leader with over 65 years of manufacturing experience.