I would totally recommend this window company. I have a big house with about 40 windows that all…read morehave sail failure and need replacement. Because it is a big project, I actually contacted at least 7-8 companies for quotes and ended up using American windows because of their best price and the best windows brand and glass package. Energy efficiency was my priority so I want the best price and best windows which seems to be very hard. But Jay (the project manager) made sure I got what I wanted. The team went out to install 40 windows and they absolutely did an excellent job. They were super friendly and professional. I'm very neat and detailed so they made sure all windows are cleaned and properly installed. After installing, they vacuumed and even mopped the floor for me. I'm very pleased with their work !

I had American Windows replace several windows and a sliding glass door. They were half the cost…read moreof another company. In my original order in 2019, they showed up on time and completed the work in a timely manner. I had an issue with opening the screen door on the sliding glass door and called them. They were responsive and sent Paul out to repair the issue under warranty. He showed up early, found the issue and repaired it. This company is the easiest and most honest I've ever used. I highly recommend them.

I needed new windows and new sliding glass doors. The previous owners of our appartment had put in…read morethe cheapest possible units with the cheapest possible labor. With regards to the heating of our home, the windows were no better than screens. I reached out, looking for windows and installers. I had a few people come in and estimate the job. None of them impressed me until Greg from Windows on Washington came over. He walked me through several options and explained how the windows they used were manufactured and why. Windows on Washington got the job. My windows and my doors were being manufactured. So they sent out a wonderful gentleman to get the final accurate measurements. Great guy. After that, communication was wonderful as were were assessed of the stage we were in. This included when we got the email and calls explaining that, since we were on a higher floor, they needed to bring in some equipment to lift the new doors up to our balcony. No surprises. Installation day was amazing as Joon and his team came in, got everything into place, and cleaned up the areas to better than when they got here. Joon then went over the features on our windows and even explained how we get to and clean the outsides of the glass. Wonderful man and amazing team. Since then, we have gotten copies of our warranty and the guarantees. And the company has reached out twice to ask if we have any questions and to ensure that we are happy with our windows. We are. We are very happy with our windows. Almost as happy as we are with the people who got them into our home.

Windows on Washington just installed 23 Okna windows in our home. From the initial visit to the…read morefinish, they did an excellent job, and they came in ahead of schedule. I recommend them highly. Roger Pilon Bethesda, MD

Jim and his crew are outstanding! I would recommend them to anybody in need of getting their…read morewindows replaced.

I'm very happy I contacted Jim at Certified Windows. I had…read morenothing but a Great experience. The quality of the windows and service were second to none. Jim who is very knowledgeable always communicated and stayed in touch through the entire process. The team was professional,efficient and exceeded my expectations. I would highly recommend them. Mark K.

I had a really great experience with ZEN Windows from start to finish. What I liked right away was…read morehow casual and easy everything felt, no pushy sales tactics, just straightforward and friendly communication. They were super responsive anytime I reached out with questions. Emails and calls were returned quickly, which made the whole process feel smooth and stress-free. They also got someone out pretty fast to measure the windows, so things kept moving without delays. I ordered 10 windows for my townhouse at the end of February, and everything stayed on track. The windows came in April, and installation was set up for the very next week, exactly how they said it would go. The install team (two guys, led by the amazing Mark) was awesome, very professional, worked efficiently, and took the time to protect my floors and furniture. They cleaned up as they went, which I definitely appreciated. Scott, the owner, stayed in touch throughout the day of installation and honestly throughout the whole process. I had a couple of window and sash issues but Scott was amazing and the kind of communication and follow-through really stood out. Overall, I couldn't be happier with the experience. They did exactly what they said they would do, and the customer service was top-notch. I'd definitely recommend ZEN Windows to anyone. It really was a calm, "ZEN-like" experience. Haha!!

Had a great experience with Zen Windows. We had been wanting to change our windows for a long time…read moredue to the noise from 270. We were putting it off because I was tired of companies calling and emailing non stop after giving a quote. Zen Windows called me once, they gave me an estimate, and then we decided to book with them. They didn't call nonstop until we decided - they gave us time to think. The process was so easy and they did an awesome job installing. The sound has been lowered SIGNIFICANTLY. Would recommend to anyone!!

We got a great deal on our new siding and ROI did a fantastic job! It was time to replace our super…read moreold siding and the sales process was fair and we did not feel pressured at all. We got a great deal and I recommend using ROI for your next project. The construction team was great and even though the project took a little longer then expected it was still done promptly. There was a slight delay because they found old asbestos siding and that needed to be removed. Our project coordinator Brooke was very nice and helped everything run smoothly.

Great company, great service. Responded very quickly, came within a day and did excellent high…read morequality exterior renovations. Very highly recommend.

Based on an experience in March 2026...project initiated after discovering damage and considerable…read morewear & tear to 15 year old townhome roof. RESPONSIVENESS - very fast, very responsive, very professional. A tad too frequent, but apparently roof repair is a competitive business. INSPECTION - scheduled and conducted efficiently; exceptionally thorough inspection report (David). COST - in line with all other quotes, which are apparently driven by the insurance estimate. Green Oak differentiation included owner interaction, master roofer certification, 5 star rating, excellent warranty, professional documentation and workflow management. WORK - scheduled efficiently, material arrived on time the day before, crew arrived on time the day of, work was conscientious and completed in 3/4 day (townhome), clean-up (including loose nail hunt) was impressively thorough. AFTER - received certificate of completion in a timely manner, along with photo record of repaired roof. Not being a roofer, it's difficult to assess the integrity of the new roof & shingles, however the end result appears clean and professional. Suspect the new, high-quality roof will increase the townhome value and/or decrease time to sell based on the high-quality products used and overall curb appeal of the work. Overall quite satisfied with Green Oak. Recommend.

After a large javelin-sized branch impaled our ~5 year-old roof, all the way through the shingles,…read moresheathing, and paper, my insurance company asked me to get a 3rd party quote to compare to their assessor's. I reached out to Green Oak after searching on Yelp (s/o), and was extremely glad I did. Brian H. took me through the process from start to finish, including an insightful explanation of the insurance claim process. The free estimate happened within a few days and ended up being lower than the insurance-assessed quote. He recommended a roof "tune up" as part of the package without pushing or trying to upsell me for more, which i really appreciated. He also accommodated my inquiry of adding on the installation of a bathroom exhaust vent cap, which was missing when we moved in. After being extremely reasonable on pricing and lighting-fast on responses, they scheduled and completed the work the day after signing. The team was efficient and respectful, with a huge attention to detail. TL;DR - Highly recommend giving Brian and Green Oak Exteriors a shot to help fix your home exterior issues, especially when you are in a bind with your insurance company!

Quick reply, professional, did not do work for us as we didn't need it after all but I'll call them…read morein the future.

had an excellent experience with this glass company! The staff was incredibly professional and…read morefriendly, making the entire process smooth and pleasant. They arrived right on time and completed the job efficiently. I highly recommend their services to anyone in need of quality glass work

We have Pella, wood, casement windows. A few have wood rot. Max and Oleg were kind enough to…read moreaccomodate my arrival time as I had to leave at a certain time. When I returned, they were already halfway done. Max and Oleg did a great job and I would happily hire them again. They are the consummate professionals.

From the owner: Cracked window? Damaged door? We specialize in fast, professional window and door repair, glass…read morereplacement, and custom glazing services throughout NoVA Area. Whether it’s a quick residential fix or a full commercial storefront upgrade, we bring expert craftsmanship to every project. Locally trusted, fully licensed, and insured—we get the job done right the first time. We offer same-day service, free estimates, and a commitment to quality that sets us apart. Call now and discover why homeowners and businesses across NoVa count on us for reliable, top-tier glazing solutions.

I am so happy with my new windows, and especially with my new sliding glass door installed my…read moreAmerican Home Contractors last week. For the first time I realize I had been hearing a fair amount of outside noise (which I'd apparently gotten used to), because these windows/doors are soundproof; now I don't hear anything at all from outside! And even better, the windows are easy to open, and my sliding glass doors actually slide well in the track, and are not shaking and drafty when it's windy outside -- major improvements from my old, builder-grade, 20+ year-old windows/sliding door. Further, the service crew was excellent -- careful, kind, professional, efficient, and they cleaned up everything afterwards. Roger, the foreman, has been doing this work for almost 30 years, and Jose, who single-handedly carried in/out the windows/doors, has been doing this work for 10+ years. I didn't get the name of the quiet third service person who was mostly outside and on the ladders, also very efficient. fyi, they did mention that working on the 4th floor of our condos from ladders was a bit more challenging as the original builder-grade windows had been made to fit by being packed/taped in place from the outside, which necessitated them having to actually break some of the glass to be able to pull the old windows out. But they did it - and did it well. Finally, Shaun, the project manager who gave me my estimate and oversaw the project from estimate, HOA approval process, to completion, was great. Highly recommended.

I had squirrels getting into my attic from an opening they made on my roof. My technician Isiah G…read more came over and assessed the situation and closed the opening right away. I thought he was going to find the opening and schedule me for a later date to fix it. To my surprise it was done ASAP. I'm so happy he was able to assist in me evicting the furry squatters also known as Sasha the squirrel and her friends.

Very Professional. Quick Correspondence. Quailty Company. Would Use Again. Highly Recommended.read more

I sought the service of this company because I had a leak in my roof and a ceiling needing to be…read morereplaced because of mold. Arif was very honest with his assessment, made sure that I had exhausted all necessary resources before spending anything out of my pocket. His patience and professionalism was at the forefront of his dealings with me as a customer. Needless to say, his team were very knowledgeable and exceptionally helpful. I was so impressed with the company that they are on my list for another project and I'm definitely recommending them to anyone that is in need of their plethora of services. The value they've brought to my family is incredible. Now my family doesn't have to worry about our child getting sick because of the mold. Thank you