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Replacement Windows


Energy-Efficient And Stunning Double-Pane Northern VA And MD Replacement Windows

Curb-Appeal. Robust Security. Durability For Decades.


Shopping for your Maryland or Northern VA home’s replacement windows doesn’t have to be complicated. In fact, it can be downright simple. We know that might be shocking to hear because when you think of ‘window replacement’, you think of tough decisions, costly installation, and disruptive construction.

Let’s not forget the pitfalls of downright dodgy replacement window contractors with their high-pressure window replacement sales tactics. Tactics like convincing you to opt for triple-pane windows when double-pane windows are – and will always be – the perfect choice for the Northern VA climate.

We, however, will tell you exactly what you need because integrity is ingrained in the fabric of who we are. With our guidance, you’ll know exactly what your home requires. Our window replacement is absolutely hassle-free and, dare we say, an enjoyable process.

And the best part? We don’t play pricing games, and we can replace your windows for up to 30% LOWER prices than national window companies.



Our Replacement Window Services For Northern Virginia & Maryland

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All great Northern VA and MD exterior contractors start with great materials – because, without exceptional products, there cannot be exceptional service.

AT Milcon Design & Build, we don’t install just any windows on your home. We ONLY offer cutting-edge, ultra-efficient windows for our specific climate. What are some of the benefits of our unsurpassed windows that make them a perfect fit for your home? Well… take your pick.

Different Window Types
Rjt Gold Series Window
  • Superb Energy Efficiency – 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.
  • Ultra-Efficient Glass/Super Spacer Technology: High-tech double-pane glass is coated in a special low-e glazed and infused with insulating argon gas.
  • Fusion-Welded Frame: The corners of the frame are fusion-welded… NOT screwed together. This creates ONE cohesive piece to eliminate corner gaps (a.k.a. air-penetration points).
  • 100% Virgin Vinyl: Our windows are crafted from pure first-generation vinyl. This provides you with the strongest, most durable frame possible.
  • Superior Weatherstripping: A heavy-duty weatherstrip design provides maximum resistance to air and water infiltration.
  • Don’t Forget The Foam: An optional insulating foam can be inserted inside your windows’ frames to deliver the highest level of energy efficiency.
  • Countless Options – Hung, slider, picture/fixed, casement, awning, bay, bow, architectural, or garden windows. Whatever style your home calls for – we’ve got the windows to fit the bill.
  • Designs Galore – Choose a grid pattern, unique color, and stunning finish that makes your home’s windows stand out from the cookie-cutter crowd. If you dream it, we can make it happen.
  • Lifetime Transferable Warranty – Proof that a window manufacturer means what they say about their build quality comes in their warranty – especially when that warranty is as good as it gets.

We Also Offer Stunning Sliding Patio Doors For Northern VA Homes

Superior Rjt Sliding Patio Door Northern Va Milcon

5 Fast Facts About Our Patio Doors

  • Our sliding vinyl patio doors are made in America by the industry’s most trusted manufacturers.
  • The frames and glass in our sliding patio doors are made with cutting-edge materials that provide incredible energy efficiency.
  • Our hinged fiberglass and steel patio doors come from ProVia, and they’re made with the same premium material as ProVia’s entry doors.
  • ProVia’s fiberglass and steel patio doors can deliver a realistic-looking wood grain texture.
  • All of our patio doors are backed by our Lifetime Installation Guarantee.

why-choose-milcon-as-Northern VA-window-replacement-contractor

Top-Rated Replacement Windows For Up To 30% Less
Than The Big, National Window Companie


Any Window Company Can Say They Have The Best Prices.
Here Are 4 Reasons We Can PROVE It.

We Go Factory-Direct

Whenever possible, we buy our windows DIRECTLY from the manufacturer. No middlemen = no outrageous markup.

Quotes By The Owner

Company Owner Matt Kavanaugh performs all quotes, eliminating the big, expensive sales staff.

“No-Bloat” Marketing Budget:

We keep advertising costs to a minimum so we can keep our overhead LOW.

Accountable, Factory-Certified Installers

We do the job right the first time, so we don’t have to go back a second time. This minimizes “callback” costs.


Why Choose Milcon For Your
Window Replacement


We Invest Considerable Effort To Ensure You
See Nothing But Excellence

As a local window replacement specialist in Northern VA, our community is our focus. So, we excel in finding the right window solutions for your home. And we easily stand out as the better choice in a window replacement industry often associated with less-than-stellar reputations.

No-Nonsense Sales Approach

We avoid the absurd sales methods the big national companies love to use, but we’ll never play ‘The Pricing Game’ when it comes to your replacement windows.

Our philosophy is simple.

Honesty and fair pricing – always.

Premium Products

As you know well by now – quality is our utmost commitment. From the aforementioned energy-efficient replacement windows to all of our other services, our way of doing things remains the same. Quality first. Quality always – starting with the materials we use.

Experienced Team

Our professionals are our strength. Really. They’re trained and certified replacement window specialists who are, above all, dedicated to their craft. And that dedication shows up on EVERY exterior remodeling project we undertake for our customers.

Strong Values

Our solid core values make us more than unique. They make us who we are. Count on us for exceptional service, quality products, and honest pricing because our beliefs rest on an unshakable foundation of core values.

Locally Owned

We know we say this a lot – because it’s very important to us. As a local business, our community is everything. It gives us a personalized approach and care that many simply can’t match. Especially the big boys who are simply in it for the numbers game.


Stunning Window Replacements To Inspire You For Your Northern VA Home


Check Out The Level Of AWESOME We Deliver To Your Northern VA Home


Northern VA MD Replacement Window FAQs


Your Questions. Our Expert Answers.

How long does it take to replace a window?

The timeframe for window replacement depends on several factors, including the type and number of windows and the condition of the existing window frames.

However, generally speaking, the actual installation of a single window can be completed in under an hour when done by an experienced technician. It’s important to note that custom orders or specialty windows may extend the timeline due to manufacturing lead times.

What is your process of window replacement like?

Our window replacement process starts with an easy consultation, where we assess your needs and offer you an initial quote. Our professionals then take precise measurements to ensure a snug fit.

Once the windows are ready, we schedule an installation date. On the day, our skilled team carefully removes the old windows, installs the new ones, and performs a thorough clean-up afterward.

One thing you can be sure of is a professional, respectful, and friendly installation.

What type of windows will Milcon Design & Build Replace?

Most, if not all, types of windows are eligible for our expert window replacement.

Our team handles everything – from consultation to installation – ensuring a perfect fit every time. We work with different window types, including double-hung, casement, picture, bay and bow, and custom designs.

We can also assist with energy-efficient and sound-reducing windows.


Reviews For Our Replacement
Windows And More


When Our Clients Are Happy… We’re Happy

Russel R.


I would 100% recommend Matt and his team

Matt and his team did a phenomenal job from start to finish. He provided a cost-effective, detailed estimate for my roof and even added in an active duty military discount! On the day of the job, he provided updates continuously and photo proof. Unfortunately some of the plywood underneath my roof was rotted and I had a small over-hang that needed to be completely reframed due to the rot. He was able to provide me with estimates for different avenues of approach to repair these.

We ended up doing a demo to the overhang at no additional cost. This was one of the most pleasant and professional experiences that I’ve ever experienced. I would 100% recommend Matt and his team to anybody in the area.

Aja W.


I will definitely use Milcon Design & Build again!

My journey with Milcon Design & Build began in March 2023, when I was looking for estimates to replace my patio door. I selected Milcon Design & Build after receiving two other estimates, because I was impressed with Matt's professionalism, his ability to answer my (many 🙂 ) questions in detail, and his prompt response. In our initial meeting, he was able to provide suggestions based on my requirements and his previous installation experiences. He then promptly followed up with the promised estimate.

The next meeting was with his technician to verify that they were going to be able to provide the larger size door I requested without causing any structural damage.

Once the door arrived, we scheduled an installation date and time (June 2023). The crew arrived on time, was very professional, and did an excellent job! Once they were done, the technician walked me through the features of the door: the active vs passive side, how to verify that it was closed and looked, etc.

Needless to say, I am more than pleased, the door looks great! I will definitely use Milcon Design & Build again!

Sharon K.


Milcon was professional in their approach

We consulted with Milcon for a few repairs we thought we needed to have done. Turns out, it was just normal wear and tear and we didn’t actually need any repairs performed. Milcon was professional in their approach and gave a honest assessment. Highly recommend!

Benjamin G.


Definitely would recommend 10 out of 10

Whole process was genuine and professional. Would not consider choosing another company after this great experience. Definitely would recommend 10 out of 10. Install crew was polite and extremely hard working. Super happy with our new windows!!!

Getting quotes for other jobs from this company because of the terrific workmanship.

Alex L.


We would recommend Matt and his team to anyone

Matt’s team recently installed new windows through our entire home. Matt took the time to understand our needs and recommend the best window for us at a great price. Took less than a month from when they ordered the windows to install date. He had a whole team arrive for installation and was able to install everything in one day. Any concerns were quickly addressed by Matt. We would recommend Matt and his team to anyone looking for good quality work at a fair price.

Mark J.


Communicative and fantastic to work with

Matt and team were great to work with. I am an engineer by trade so, naturally I had a ton of questions. Matt did a great job of answering them all and putting me at ease knowing I was getting a great product at a great value. We had a new architectural roof and 37 windows installed on our home. Both crews were communicative and fantastic to work with. Highly recommend!



Get A FREE, 30-Minute Quote (Yep. Just 30 Minutes!)

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!

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