
Welcome to Milcon Design & Build, the best place to find window installation, replacement, and repair services in Woodbridge, VA, and beyond. Kick back while we explain why you should choose our company for this task, talk about our different services, how we approach our work, and several other nuggets of important information.
Our year-long journey in Northern VA and Maryland, helping customers get the best windows, doors, and a quality roof over their heads, has earned us two things: experience and customer trust. In this line of work, experience is key because the more you work, the more problems you will face.
Apart from the obvious fact that nice-looking windows will improve the look of your home or office and boost its overall curb appeal, there are many other benefits, the main one being energy efficiency. With good windows and proper insulation, you won’t have to spend as much on your energy bills.
We care for our customers and are always 100% committed to customer satisfaction. Our quality of service is on par with that of the best contractors worldwide.
We believe there are many reasons to contact us and begin the process, but we were able to group those reasons into three distinct categories.
As industry professionals, we know the best way to help all our customers. At Milcon, we offer free quotes because this is just the first step, and it should be as easy as possible. We have a showroom where new and returning customers can view our previous work and discern whether this is something they would be interested in.

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.
Customers who want replacement windows also want some work done on their doors, and this happens more often than not. Well, you’ve come to the right place, as we can offer door installation services that will complement your new windows.
We offer everything from patio doors to entry doors, and our door installation services follow our “perfect fit” philosophy. We also offer custom options for customers looking for something very specific.
With our door installation and replacement services, you can give your Woodbridge home or office added security, more curb appeal, and improved energy efficiency. We offer trust, expertise, and professionalism.
We are open Monday through Saturday from 8 a.m. to 6 p.m., and you can call us at (703) 581-2761 during those times.
We won’t beat around the bush here. There are three main benefits, all of which have already been mentioned.

Feel at ease with your power expenses. Our windows offer superior energy efficiency through the dual benefits of our Warm Edge Super Spacer and High-Performance AGC Low-E glass.
High-tech double-pane glass is coated in a special low-e glazed and infused with insulating argon gas.
Properly installed windows and doors will lower your bills and, as an added bonus, reduce the overall environmental impact.
When you improve your curb appeal and energy efficiency, the value of your property will go up.
With enhanced security and comfort, homeowners can have peace of mind knowing that they won’t have to go into expensive renovations for years.
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!
Vinyl windows and all energy-efficient window options are the best choice both in terms of price and longevity.
Of course. We offer everything from patio doors to entry doors. You can explore our services by visiting our main page and navigating from there.
We are professionals, and our process is as efficient as it can be. When we are done with measurements and all the material is at the location, we can be pretty fast. We can probably finish the installation process in less than an hour.
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!