Our Entry Door System

Elegant, Energy Efficient, Durable, Secure.



Our Triple Pane Window

Our super energy efficient Triple Pane Window exceeds DOE Energy Star requirements by 30% and outperforms regular double pane window by 250%.



Our Roofing System

We are proud to be Owens Corning's Preferred Contractor. Owens Corning will provide you with a 10 year workmanship warranty on your new roof.



Our Siding System

The right preparation work will eliminate air movement through your walls. Our fiber cement or insulated vinyl siding will beautify and save energy for your home all year round.



Our Trimwork

Detail oriented trim and accent work will produce compliments while keeping the elements out!



We are what we repeatedly do!

From its inception Crystal Exteriors LLC has been successfully providing home exterior services to thousands of homeowners in Maryland, Northern Virginia and the D.C. area. We provide quality professional services and high performance products including high energy efficient materials. We specialize in vinyl or wood replacement Windows, fiberglass or steel Entry Doors as well as insulated vinyl or fiber cement Siding and Asphalt Roofing. Our business is cultivated by word of mouth testimony, not high pressure sales tactics or gimmicks. Our remarkable growth is due to 80% of our business coming directly from referrals. We guarantee our customers a professional service with personal care and respect.


Or call us at 301-681-8186 for your best quote.

Remodelers, home builders, and real estate developers rely on GuildQuality's customer satisfaction surveying to monitor and improve the quality of service they deliver.




  • I had Mr. Li (owner-Crystal Exteriors) install two exterior doors and one window. He was extremely reliable; both Mr. Li and his installers showed up precisely when they said they would. The workmanship was excellent, and they cleaned up well when they finished. I do not hesitate to recommend them.”

    Steve B. of Potomac, MD
  • Crystal has installed two roof systems for me, one for my personal home and one rental, also installed complete window systems on my personal home and two rentals, sided my personal home. They offer high quality workmanship and product plus a very reasonable price. You just can not do any better!”

    Charles M. of Rockville, MD
  • High quality products and excellent workmanship. Excellent customer service from Edgar Li. Already have recommended them to friends.”

    Doris C. of Silver Spring, MD
  • Apart from the quality work, Edgar Li puts no pressure on his clients, unlike many other firms who insist you sign on the dotted line immediately in return for some minute discount from a much higher price. Installation of a replacement for the front door went equally flawless, and we saved several thousand dollars. It’s a joy to work with Crystal Exteriors.”

    Editha S. of Potomac, MD
  • Edgar Li has completed work on my house for over 20 years. I trust him completely. He has always given me a excellent job and a very fair price. My wife and I always recommend Edgar and his company to our neighbors, friends and family.”

    John T. of Silver Spring, MD
  • Crystal Exteriors did a great job replacing my Roof Shingle, Trim, Gutters and Downspouts. They are professional and reasonable, and finished the job in a timely manner!!”

    Annie A. of Rockville, MD
  • I had all my 18 windows replaced over the last summer. I evaluated two contractors and both gave excellent sales presentations and the prices were competitive. I decided to use Crystal Exteriors because I felt the owner of Crystal Exteriors, Edgar Li, was very professional and willing to work with me, in terms of pricing and other issues. The work was done in a professional manner. After the windows were replaced, Edgar himself stopped by few times to make sure that the windows were satisfactory.”

    David K. of North Potomac, M
  • We have used Crystal Exteriors for several jobs over the past two years, including one large and one small job involving replacement windows, and two roofing jobs for my parents’ and my homes. On every occasion, the entire experience was highly positive, professional, and always at reasonable cost. Edgar Li and his crew are top-notch. We could not be happier.”

    Sandra M. of Rockville, MD
  • I just referred a friend to Crystal Exteriors today. They did an excellent job to install my three new doors. It was easy all the way around. They were timely and professional. I speak highly of them and refer them to everyone that I talk to.”

    Andre S. of Falls Church, VA
  • They are without a doubt the best contractor we have ever had in 28 years. This company is a top notch company!”

    Kelvin C. of Silver Spring, MD
  • Crystal Exteriors did an excellent job replacing siding on the house, numerous windows and sliding glass doors, and needed work on the roof. I particularly appreciated Mr. Li’s approach to each job. I never felt pressured by him. He listened to what we wanted and provided reasonable answers on the pros and cons of alternatives before we made a decision. He monitored the job on a daily basis to ensure it was being done to our satisfaction. The workmanship was excellent and the service was outstanding. Couldn’t ask for more.”

    Jeff B. of McLean, VA
  • We cannot say enough good things about this company. Edgar Li and his crew are courteous, prompt, and thorough. We had a lot of questions about the product and process, and he sat down with us so he could understand our needs and answer all our questions. The installation was smooth and quick and the crew left our house tidy and neat. Needless to say, the doors look wonderful. We had a great experience and highly recommend his work.”

    Nannatte B. of Silver Spring, MD
  • Edgar Li and his crew replaced our roof recently and were terrific. He was by far the most responsive contractor I’ve ever dealt with, and always returned emails very promptly, provided me with photos of all the prior roof damage, and gave me lots of information on the process. Very fair pricing too. Would highly recommend.”

    Rebecca S. of Gaithersburg, MD
  • I used Crystal Exteriors years ago for window/door installation, and based on that positive experience called them back for a door, siding and gutter replacement. The door being replaced was a custom size and a tricky installation; Crystal Exteriors reviewed our options, gave us a great selection, and handled a complicated installation on an older home professionally and did it right the first time. I will continue to use Crystal Exteriors for exterior door/window replacement, siding, and so on, and highly recommend them.”


Consumers' CheckBook Nonprofit, Independent rating

Let us show you how we can give you superior service

ProVia Certified Installer

We are experts in the installation of all Provia doors

Owens Corning Preferred Contractor

We meet their strict standards for professionalism, business stability and customer service.

Certified Certainteed Master Shingle Applicator

Angies List

We rank high on this list


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