
Ever looked out your window and imagined how a simple upgrade could transform your home — not just in appearance but in comfort, energy efficiency, and value? It’s easy to overlook windows as just another part of the house, but they’re so much more.
They’re the portals that frame your view of the world, invite sunlight into your home, and even play a critical role in keeping your energy bills manageable.
Now, imagine windows that do all that and more — beautifully crafted, durable, and tailored perfectly to your home. That’s exactly what you can expect with our windows services in Sterling, VA.
Whether you’re upgrading outdated fixtures or designing your dream home from the ground up, Milcon Design & Build is here to make your vision a reality. Let’s explore how we can redefine your home with the windows it deserves!
At Milcon Design & Build, we take pride in delivering exceptional window and door solutions to Sterling, VA, and the surrounding areas. As a family-owned and operated business, we bring a personal touch to every project while maintaining the highest standards of quality and customer satisfaction.
Whether you’re looking to replace aging windows or upgrade your doors with custom designs, our team is here to bring your vision to life.
Here’s what sets us apart:
Family-Owned and Operated: Our commitment to quality and personalized service ensures your experience is seamless from consultation to installation.
Extensive Selection:We offer a wide variety of replacement windows and custom doors to match your home’s style and your specific needs.
Factory-Direct Pricing: Benefit from high-quality products and installations without the middleman, ensuring you get the best value for your investment.
Do you want to discuss your vision for windows, doors, siding, or gutters to create a space that’s as functional as it is beautiful? Call us for a free estimate and consultationto explore how we can transform your home.

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.
Our comprehensive services ensure your home benefits from unparalleled style, durability, and energy efficiency. Here’s what makes our window systems and services the trusted choice for your home:

1. Customers consistently praise the quality of our windows, professional installations, and exceptional service.
2. We offer premium products at fair prices, enhancing your home’s value while staying within budget.
3. Our vinyl siding, windows, and doors are engineered to withstand the harshest weather conditions, ensuring long-lasting durability.
With Milcon Design & Build, you’re not just investing in windows — you’re choosing unparalleled quality and unwavering dedication to protecting and improving your home.
Transform your home with Milcon Design & Build’s Sterling Windows – the perfect blend of durability, elegance, and energy efficiency.
Our premium windows are designed to enhance your home’s aesthetic appeal while providing superior protection against wind, rain, and irritating insects. Enjoy trouble-free get-togethers!
Whether you’re upgrading outdated windows or seeking a fresh new look, our team ensures seamless installation and outstanding craftsmanship tailored to your unique needs.
So, let us help you create a more comfortable, stylish living space that suits your taste and lifestyle. With Sterling Windows, you’ll enjoy improved energy efficiency, reduced noise, and an undeniable boost in curb appeal.
Here’s why your neighbors trust us:
We’re more than just a roofing company — https://milcondesignandbuild.com/always-local/. Our team is dedicated to building strong, lasting relationships with our clients by understanding their specific needs and delivering tailored solutions.
With our durable roofing solutions, your new roof provides long-term protection against harsh weather conditions. Our mission is to provide people with cost-effective investments with reduced need for frequent repairs and maintenance, so you can enjoy under your roof with peace of mind
Our skilled contractors bring professionalism to every project, ensuring the highest standards of craftsmanship. From small repairs to full roof replacements, we focus on providing solutions that meet your home’s unique requirements with precision and care.


At Milcon Design & Build, style meets strength! Our roofing systems elevate curb appeal while offering lasting protection against the elements.
We provide expert guidance to help you choose the perfect roofing solution for your home, office, or business, ensuring quality and satisfaction.
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!
As a family-owned business rooted in the Northern Virginia community, we take pride in offering personalized service that reflects our deep commitment to integrity and quality.
What sets our windows apart? Well…
We source factory-direct products, ensuring you receive premium materialswithout the hefty price tag. Whether you’re upgrading to energy-efficient windows or exploring custom designs, our experienced team delivers tailored solutions that enhance the beauty and value of your home.
Choose Sterling Windows by Milcon Design & Build for unmatched craftsmanship, exceptional service, and the peace of mind that comes from working with a trusted local leader. Experience the difference today.

Your roof is more than just a structure; it’s your home’s first line of defense against the elements. At Milcon Design & Build, we take pride in delivering top-rated roofing services that safeguard your property, enhance its curb appeal, and ensure lasting peace of mind.
So, don’t leave your Springfield roof vulnerable — partner with the professionals who understand the importance of quality and reliability.
Contact Us now to discuss your roofing needs or schedule your free estimate. Let us help you protect your home with confidence.
The timeline for a commercial roof replacement can vary based on the project's scale and complexity. However, our seasoned professionals are committed to executing the job proficiently to industry standard timelines and even better – minimizing disruption to your business operations.
Generally, we aim to complete most commercial roof replacements within a few days to a few weeks, depending on size of course while still ensuring quality isn't sacrificed for speed.
Choosing the right roofing system for your commercial property involves considering factors such as building design, climate, and budget.
With a wide array of top-tier commercial roofing materials available, including GAF’s TPO, EverGuard® PVC membrane, and the protective GACO coatings, we can help you make the right decision.
Our expertise spans decades, and we'll guide you to a selection that elevates your property's appeal while delivering enduring protection.
Indeed! We understand that every building comes with its unique design requirements, and we're more than prepared to accommodate your needs. Our team of experts has the skills and experience to create a tapered roofing system tailored specifically to your property's structure and aesthetics.
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!