Ask us about our new high-efficiency double-pane and triple-pane vinyl windows, featuring the latest technology and available in just 5 to 7 business days.

Text Us For A Free Estimate: (703) 975-5500

Other companies spend 2 to 3 hours wasting your time on high-pressure sales when the estimate should only take 20 minutes at the most. Certified Window Co. values your time, and we make it easy!

Text your window quantity and a picture to (703) 975-5500, or just call, and get your Free Window Estimate within 5 minutes!

Custom-made windows starting at $245 each.  Minimum order: 10 windows

Certified Window Co. provides high-quality vinyl replacement window installation for homeowners in Fairfax, VA and throughout Northern Virginia. Our energy-efficient windows are designed to improve comfort, enhance curb appeal, and reduce energy costs—all without high-pressure sales tactics.

Call 703-975-5500 today for a free, no-obligation estimate.

Work Directly With the Owner, No Sales Pressure!  When you contact Certified Window Co., you work directly with owner James Ragusa. With nearly 40 years of experience in the window replacement industry, Jim understands that replacing windows is a major investment.

That’s why we focus on education, transparency, and honest recommendations, not rushed decisions or aggressive sales tactics. Our goal is to help you choose the right vinyl replacement windows for your home, budget, and long-term needs.

Affordable, Energy-Efficient Vinyl Replacement Windows

Certified Window Co. specializes in discount vinyl replacement windows without sacrificing quality. We offer:

• Energy-efficient vinyl windows designed for Virginia’s climate
• A wide selection of styles to match any home
• Professional installation by experienced craftsmen
• Low, wholesale pricing that delivers real value

We believe our quality workmanship, extensive product options, and competitive pricing speak for themselves.

Serving Fairfax County & Northern Virginia

Based in Fairfax County, Virginia, Certified Window Co. proudly serves homeowners throughout Northern Virginia, including: Fairfax, Sterling, Ashburn, Falls Church, Herndon, Reston, Springfield, Alexandria and Annandale

Whether you’re replacing a few windows or upgrading your entire home, we provide expert vinyl window installation you can trust.

Why Choose Certified Window Co.?

• Nearly 40 years of industry experience
• Owner-led service and personalized attention
• No-pressure, honest estimates
• Wholesale pricing on premium vinyl windows
• Energy-efficient solutions for long-term savings

Schedule Your Free Window Replacement Estimate: If you’re looking for vinyl replacement windows in Fairfax, VA or Northern Virginia, trust Certified Window Co. for quality, value, and integrity.

Call 703-975-5500 today for your free, no-pressure estimate.

Certified Window Co. has been a family-owned vinyl window replacement company since 1984, proudly serving Fairfax, VA and the surrounding Northern Virginia and Maryland areas. With decades of experience, we’ve built a reputation as a trusted leader in energy-efficient vinyl window installation.

If you’re considering upgrading to modern, insulated vinyl replacement windows, we can enhance your home’s appearance, comfort, and value, while helping reduce monthly energy costs.

Energy-Efficient Vinyl Windows Designed for Your Home

Certified Window Co. specializes in new and replacement vinyl windows that are engineered for performance, durability, and long-term energy savings. Our windows are custom-made to fit your existing openings precisely, eliminating the need for costly structural modifications often required with off-the-shelf windows.

Whether you’re:

• Remodeling or renovating your home
• Replacing aging or inefficient windows
• Building a new home

We deliver vinyl windows that combine strength, beauty, and efficiency.

Double-Pane & Triple-Pane Vinyl Window Options

Our energy-efficient vinyl windows are available in:

• Double-pane configurations for reliable efficiency and value
• Triple-pane options for maximum insulation, comfort, and noise reduction

No matter your home’s style—traditional, modern, or contemporary—we offer window designs that complement your architecture while meeting your performance and budget goals.

Serving Virginia & Maryland Homeowners

Based in Fairfax County, Virginia, Certified Window Co. proudly serves homeowners across:

• Virginia
• Fairfax County
• Arlington County
• Maryland
• Montgomery County
• Prince George’s County
• Howard County

We offer wholesale pricing on premium vinyl windows throughout Virginia and Maryland, helping homeowners maximize value without compromising quality.

Quality Windows. Expert Installation. Lasting Value.

We take great pride in:

• The quality of our insulated vinyl windows
• Precision, professional installation
• A wide selection of window styles to fit any home

Our experienced installers ensure every window is properly fitted, sealed, and installed for optimal performance and longevity.

Why Homeowners Choose Certified Window Co.

• Family-owned and operated since 1984
• Custom-fit vinyl replacement windows
• Energy-efficient double- and triple-pane options
• Wholesale pricing in Virginia and Maryland
• Expert installation with attention to detail

Your Local Energy-Efficient Window Replacement Specialists

If you’re looking for vinyl window replacement experts in Fairfax, VA, Northern Virginia, or Maryland, Certified Window Co. is ready to help you find windows that fit your home, your style, and your budget.

Contact us today to learn more about our energy-efficient vinyl replacement windows and professional installation services.

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.

Lorton, VA
Springfield, VA