

Matt Kavanah is the owner of Milcon Design & Build. He has 20+ years of experience and has a simple philosophy, only the absolute best will do. On every single job. For every single customer. Down to every single detail.
Old, drafty windows can significantly impact your home’s energy efficiency, causing your heating and cooling bills to skyrocket. Energy-efficient windows are designed with advanced insulation features to minimize heat transfer, keeping your home comfortable year-round while reducing energy costs. With our selection of energy-efficient replacement windows in Centreville, you can enjoy comfort and lower utility bills for years to come.
Your family’s safety is our top priority. Newer windows are built with durable materials and advanced locking mechanisms to provide added security and peace of mind.
Your home’s exterior is important in making a lasting impression. With our wide selection of replacement windows in Centreville, you can upgrade the aesthetic appeal of your home and increase its market value. Choose from various styles, colors, and finishes to complement your home’s architecture and reflect your personal style.
We understand that every home is unique, and so are the needs of its owners. That’s why we offer customized window solutions that perfectly fit your specific requirements and preferences. Our team works closely with you to understand your goals and provide tailored advice, ensuring that every detail is accounted for.
When considering the replacement or installation of new windows in a home, it’s important to understand the variety of window types available to best suit your needs and aesthetic preferences. Single-hung windows are a classic choice, featuring a bottom panel, or sash, that moves vertically, while the upper sash remains stationary. They are an economical and energy-efficient option. In contrast, double-hung windows allow both the upper and lower sashes to move, improving air circulation and making them easier to clean.
Casement windows offer a different approach with a sash that is hinged on the side and opens horizontally opposite to the hinge. This type of window is known for its excellent ventilation capabilities and tight sealing when closed, making it ideal for energy savings. Awning windows, similar to casement windows, are hinged at the top and open outward, allowing for ventilation even during a rain shower.
For unobstructed views and ample natural light, picture windows are an excellent choice. These large, stationary windows don’t open but provide expansive views and can dramatically increase the brightness of a room. Conversely, slider windows open horizontally and are perfect for modern homes with limited space outside to accommodate a window that swings out.
Bay and bow windows can transform a room by extending outward from the wall, creating a sense of spaciousness. They typically combine fixed and operable windows, providing both a broad view and ventilation. These types of windows are perfect for creating cozy window seats or aesthetic nooks.


We begin by understanding your specific needs and preferences during a thorough consultation. Our experienced team will assess your existing windows, discuss available options, and provide personalized recommendations tailored to your budget and requirements.

Once you’ve selected the perfect window replacement for your home, we’ll take precise measurements to make sure it’s a perfect fit. Our windows are custom-built to seamlessly integrate into your existing openings, providing a flawless finish and optimal performance.

Our certified window installers will handle every aspect of the window installation process with precision and expertise. We prioritize efficiency and attention to detail to minimize disruption to your daily routine and ensure a seamless transition from old to new windows.

We stand behind the quality of our workmanship and products. Our window replacements come with industry-leading warranties for your peace of mind, guaranteeing long-lasting performance and customer satisfaction.

Our installers are certified and highly skilled, bringing years of experience to ensure a flawless installation process. We use only the best tools and techniques to ensure that your new windows are installed correctly and efficiently, with minimal disruption to your home.

At our company, we pride ourselves on providing outstanding customer service from start to finish. We are committed to your satisfaction and are always ready to answer any questions you may have. Our goal is to make the process of getting new windows as smooth and stress-free as possible.
In addition to replacement windows, we also offer comprehensive window repair services to address any issues you may be experiencing with your existing windows. Whether it’s foggy glass, broken seals, or damaged frames, our skilled technicians can diagnose and resolve the problem promptly, restoring your windows to their optimal condition. Our team is equipped to handle a wide range of repairs, including leaks, drafts, and operational difficulties, ensuring that your windows function smoothly and efficiently.
We understand that window problems can lead to higher energy bills and decreased home comfort. That’s why we prioritize a thorough inspection process to identify the root cause of any issue and provide effective, long-lasting solutions. From replacing worn-out hardware to resealing gaps that lead to air leakage, we’re committed to improving the performance and longevity of your windows.
Our repair services are designed to be as minimally invasive as possible, causing little to no disruption to your daily life. We use the highest quality materials and the latest techniques to ensure that repairs are not only effective but also blend seamlessly with your existing window structure. Whether you’re dealing with a single problematic window or require comprehensive repairs throughout your home, our professionals are ready to deliver superior service and exceptional results.

Choosing the right type of window not only enhances the look of your home but also contributes to better energy efficiency and functionality. Consider the architectural style of your home, your climate, and your ventilation needs to select the best windows that will blend aesthetics and practicality.
Upgrade your home with premium replacement windows in Centreville. Contact us today to schedule a consultation and take the first step toward improving the comfort, beauty, and value of your home. With our expertise and dedication to customer satisfaction, you can count on us for all your window installation, replacement, and repair needs in Centreville.
Posted on Google Nolian PapaTrustindex verifies that the original source of the review is Google. Excellent work, and the estimating scheduling process was very quick and hassle free. I'm really glad I went with Milcon.Posted on Google Jonelle HillearyTrustindex verifies that the original source of the review is Google. We’re so pleased to be able to provide this review of our recent window replacements project with Milton Design and Build- all in all, truly a 5 star event. Owner, Matt Kavanah, followed up on a Thumbtack request for proposals with a home visit to see what we needed and how Milcon Design and Build could help. Matt explained the process, how long it would take to order and get ready for the installation, and most importantly, what we could expect as performance from the ProVia window and door products recommended for our home. Matt indicated that he would have Project Manager, Josh, come out and take precise measurements to make up the order, but for the proposal pricing he was able to give us a very competitive bid based on our conversation that day. We kept coming back to Matt’s straightforward conversation and the value of the windows we would be ordering. The price and quick time-to-install just sealed the deal. Matt made some key suggestions that, after our installation today, proved to be great advice. One of the reasons we chose to do a window replacement now (January) was the cold spots in both our primary bedroom and dining room - opposite ends of our house. Even upgraded HVAC hadn’t been able to overcome the heat loss. Tonight, with a new package of high-efficiency thermally broken windows and sliders installed, we’re actually turning the thermostat down because we’re warm! Thank you to Matt, Josh, Luis, Martin, and the rest of the crew for a great job, for explaining all the tips and techniques to get the most out of the new windows and front door, as well as to keep them looking beautiful for years to come! Thank you, Milcon Design and Build for working with us on this purchase… you guys are awesome!Posted on Google Thomas VolkTrustindex verifies that the original source of the review is Google. Outstanding! After weeks of countless window contractor interviews, we found the perfect company. Matt at Milcon, with his many years of experience, provided us with detailed product descriptions to meet our environment requirements, that included muffling the Ashburn Data Center and air traffic noise. They installed over 40 windows in two days! Most important, my wife is so happy with our choice.Posted on Google Willmer RomeroTrustindex verifies that the original source of the review is Google. I went to Milcon for a quote and they came in under the competition. The staff was super professional and did everything I asked for. The team was quick and was done within hours. I would go back for any future projects.Posted on Google Bernadette RahmaniTrustindex verifies that the original source of the review is Google. Matt was very professional, gave us very good advice for the 2 massive doors we had to replace. We were very happy with the process, the execution of the project and the products. We had a very pleasant experience with Matt and his installation crew. Thank you so much.Posted on Google Meghan KavanahTrustindex verifies that the original source of the review is Google. Excellent customer service. Quick install. Impeccable job. Would highly recommend!Posted on Google Josh EvansTrustindex verifies that the original source of the review is Google. Right on time. Matt and his team did what they said they were going to do when they said they were going to do it. Painless process from start to finish. I had a new roof in about 48 hours. Highly recommended.Posted on Google Justin HoughtonTrustindex verifies that the original source of the review is Google. We were in need of a roof replacement so we threw out a few requests on Thumbtack and I’m glad we did since it brought us to Milcon Roofing. Matt reached out very quick and if I recall correctly came out the following day to discuss options. He wasn’t pushy or trying to just sell me something. It was clear he has been in the business for years and more or less just informed me of my options. He also noted his crew gets certified on the roofing systems which we really liked. So we needed up asking for a quote and it was very fair and competitive. I will say, Matt was very professional, quick to reply to texts, his quote was very fair, and his crew was on time and knocked out the job out in less than one day. Oh, also their clean up was outstanding. While I hope to never see Matt again (since the roof will last many more years than we should be here) I would 100% call him back for any future work here or at our next home. If you need a new roof, give them a call, you won’t regret it!Posted on Google Jorge Manuel TrasmonteTrustindex verifies that the original source of the review is Google. We hired Milcon Roofing, Design & Build for replacing the original aluminum siding on our house. Matt took the time to explain different options and we opted for the insulated siding. Matt was very easy to work with and communicated with us through the entire process. The work crew did an great job despite some days with rough weather. We are very happy with the results, less cold drafts, a reduction in noise and a more modern looking exterior. Everything looks great! Can't recommend enough.Posted on Google Kristina MilbergTrustindex verifies that the original source of the review is Google. Matt and his team were great to work with, would recommend!
Ready to “cut the fluff” and get a no-nonsense Northern Virginia exterior remodel starting with a stress-free, 30-minute, no-obligation quote from the owner himself?
Then call us at 703-581-2761 or fill out our hassle-free form to schedule your free quote today!