Testimonials

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, Montgomery County, MD 20901
(Found on CheckBook.org)

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, Fairfax County, VA 22102
(Found on CheckBook.org)

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, Montgomery County, MD 20901
(Found on CheckBook.org)

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

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

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

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, Montgomery County, MD 20901

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, Montgomery County, MD 20854
(Found on CheckBook.org)

High quality products and excellent workmanship. Excellent customer service from Edgar Li. Already have recommended them to friends.

Doris C. of Silver Spring, Montgomery County, MD 20901
(Found on CheckBook.org)

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, Montgomery County, MD 20850
(Found on CheckBook.org)

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, Montgomery County, MD 20854
(Found on CheckBook.org)

Like many of you, you employ some contractors that are decent but you have a select few contractors that you would recommend to anyone without hesitation. Crystal Exteriors is one of the latter for me. You get to deal with the owner, Edgar, directly. He communicates very well and is responsive. It was no problem for Edgar to give me an estimate on short notice, and the project was completed exactly as promised without a hitch. If you want a smooth job with personal attention and no drama, go with Crystal Exteriors.

Bryan L. of Kensington, Montgomery County, MD 20895
(Found on CheckBook.org)

I cannot say enough positive about Edgar Li, the owner of Crystal Exteriors. I have over many years as a homeowner contracted for many services, and I can say with absolute certainty that Crystal Exteriors is the best -- the BEST -- service provider I have ever used. I had an issue with plantation shutters that were on my old French doors and wanted to use them on my new patio doors. No other door company, large or small, could assure me that my shutters would work. Edgar guaranteed it. His product is beautiful, his prices are more than fair, and he was completely knowledgeable about his product. He called when he said he would and he showed up when he agreed to be here, Installation day was perfect. Edgar and his workers arrived right at the agreed upon time, they were fast and efficient and cleaned up after themselves. All in all, I recommend Edgar and Crystal Exteriors without hesitation or reservation.

Carlene A. of Potomac, Montgomery County, MD 20854
(Found on CheckBook.org)

It is refreshing to deal with a business that makes customer satisfaction their number one priority. Evidence of that was the owner, Mr. Edgar Li, not asking for payment until the work was completed and I was satisfied. The whole process from beginning to end was easy. I was given a consultation appointment promptly with Mr. Li. He showed up on the dot at the agreed time, and most importantly, he listened and addressed my needs. I never felt he was recommending a feature just to increase his bottom line. My job included some complications such as: (1) rain coming in and damaging the subfloor which was discovered not long ago when the floor tiles were replaced by another contractor, (2) exterior wood and threshold rotting, (3) having a security wired contact on the door, (4) desire to reuse a recently purchased deadbolt lock, and (5) meeting the Homeowners Association criteria. Every concern was taken care of by Crystal Exteriors. Mr. Li emailed a detailed proposal in the evening, the same day as the consultation. On the day of installation, Jaime (crew leader) patiently listened as I went over some of the details of the job. It was apparent that he was already well briefed by Mr. Li who also came by to oversee the job, although he did not need to stay for the entire day. Jaime has been with Mr. Li for at least 20 years which is a testament of experience. The crew took their time to do the work properly. Also, the plastic tent that they set up in the foyer to keep the cold out was much appreciated since it was February. I got a beautiful ProVia fiberglass door that is factory painted, which means a smooth finish and no painting needed on my part, and sidelites with internal grids which makes cleaning the glass easy. When the job was finished everything worked as it should, including the security system, my house key for the new bottom lock as well as the reused top lock, and the doorbell. If quality is your foremost factor in hiring a contractor, Crystal Exteriors is the definitive choice for door replacement.

Eric C. of Bowie, Prince George's County, MD 20720
(Found on CheckBook.org)

Crystal Exteriors did a gutter replacement on our home in addition to siding replacement (see separate review). All of our gutters/downspouts had special issues; for most of them, we had a option built in to divert water to rain barrels in the summertime and for regular drainage in the winter. Crystal exteriors did an outstanding custom job, the work crew were professional and prompt. I would highly recommend Crystal Exteriors for any such outdoor work.

Keith L. of Silver Spring, Montgomery County, MD 20901
(Found on CheckBook.org)

I'm pleased to describe our very positive experience with Crystal Exteriors. We contracted with Crystal Exteriors to do a multipart renovation of our home in Great Falls, VA, including a new roof, new front and side doors, and a complete resealing/caulking of all of our windows. Crystal and its owner Edgar Li impressed us as being unusually easy to communicate with and very meticulous in keeping us informed as to intended schedule and progress. Edgar's crews were extremely hard working and completed high quality work very close to the promised schedule. Edgar also gave us very good advice as to choosing materials and finishes that were appropriate but also economical while taking advantage of new innovations and products. The new doors are perfectly hung and function perfectly. The new roof is beautiful and the new skylights are a real upgrade over the old ones.As in any project, a few items came up that needed to be addressed ( for example a lock incorrectly shipped from the factory) and Edgar and the team addressed them promptly. Cleanup was done well and the team did not leave a mess. We would unhesitatingly hire Crystal Exteriors again.

Amanda S. of Great Falls, Fairfax County, VA 22066
(Found on CheckBook.org)

Great! Very Professional and walked us thru the entire process from door parts to installation. Communicated effectively throughout the process. Delivered on everything promised, on time and within budget. They saved us thousands compared to other estimates. Installers were very polite, provided timely quality service, clean up nicely and went above and beyond our expectations. To top it off the door is so well built, it is energy star compliant with a lifetime warranty. I would use them again and recommend them highly!

Terry T. of Lanham, Prince George's County, MD 20706
(Found on CheckBook.org)

All the positive reviews about Mr. Li and his crew are true! He is quick to respond to messages, is prompt for estimates, and very knowledgeable with good suggestions to fulfill our needs. We are very happy with our new entry door and storm door. I highly recommend Crystal Exterior and will hire them again for future work.

Marc L. of Rockville, Montgomery County, MD 20852
(Found on CheckBook.org)

Very detail oriented. Very responsive to my questions (we exchanged a lot of emails). Had recommendations, but willing to adapt to my concerns and preferences. The installers were great. Careful, clean (at least they cleaned up after themselves), easy to communicate with (they spoke English). Handled some unexpected difficulties installing our door (and basement window) within the expected timeframe and without additional fees. The owner followed up to make sure we were happy with the job. They weren't the cheapest option but they weren't much more expensive and I feel like I got a good value.

Jennifer M. of Fairfax, Fairfax County, VA 22031
(Found on CheckBook.org)

Worked very closely with Mr. Li in selecting the proper door for our house. He was extremely professional and very detail oriented. He provided us with options, one of which was to remove the storm door and just have a wood style door. His recommendation was excellent. the new door on the house has so increased the curb appeal of our house. In addition, his staff was very accommodating in the installation of the door. I would highly recommend Mr. Li and his company for any subsequent work on our house.

Richard W. of Annandale, Fairfax County, VA 22003
(Found on CheckBook.org)

Crystal Exterior installed a Provia door for us, including a storm door, and pilasters. They even painted the pilasters to match the house trim. The installation was very professional and the product is beautiful. The process of choosing the specific door and hardward was made very easy with Edgar, who answered our slew of questions promptly and thoroughly. Edgar even emailed us a mock up of our house with the door we chose so that we could see what it looked like on our house. After the installation, we emailed Edgar to ask if we should apply WD40 to the storm door which squeaked. Edgar said he would come by the next day to apply a silicone spray to the door as WD40 leaves a residue. Crystal's service is amazing, their pricing is competitive, and the installation of door was professional.

Quincy Y. of Gaithersburg, Montgomery County, MD 20879
(Found on CheckBook.org)

Mr. Li is awesome. Professional, knowledgeable, thorough. Purchased a provia front door and love it. Replaced an old original, ill-fitting and inefficient wood door. The door is great quality and is tightly sealed against airleaks. His team is also tidy, courteous and effiecient. Can't say enough great things about working with Crystal Exteriors. Mr. Li took care of all the details including follow-up to see if we were satisfied. The best!

Michelle F. of Kensington, Montgomery County, MD 20895
(Found on CheckBook.org)

Crystal Exteriors replaced my front door. The owner, Mr. Edgar Li, was very friendly, always reachable and responsive by telephone and email, did not try to pressure me into buying more expensive products or additional products besides that which I wanted, provided sound advice on product options, and his installation crew was very neat, thorough, professional, and did an outstanding job. I will certainly hire Crystal Exteriors again in the future for other home improvement projects.

Brian T. of NW Washington, DC 20012
(Found on CheckBook.org)

Installed new front door and sliding glass patio door. Were very responsive in providing an estimate and in answering subsequent questions about options and costs. Work crew of 3 showed up at scheduled time and completed all work in just over 6 hrs. Before fastening new frames in place, they checked to ensure these were vertical both directions: in-out and across, and that the frames were square (all adjacent sides exactly 90 degrees). Spaces between door frames and house frame were filled with spray foam insulation. New inside and outside trim were neatly cut and alignment and fit were good. Caulking around all joints was neatly done. They checked their work as they proceeded and at the end. They cleaned up in stages as work proceeded, so there was only limited clean-up needed at the end. Otherwise, Crystal works almost exclusively with ProVia doors, so choosing them will also essentially require buying those doors. ProVia provides lots of options and appear to be good quality products, but they're not inexpensive.

Don P. of Derwood, Montgomery, MD 20855
(Found on CheckBook.org)

After researching front entry doors, we decided to replace our front entry door with a ProVia door (which included a whole new frame with sidelights, hinges, door knobs, etc.). We decided on ProVia because we wanted a high quality, energy efficient, functional door system that would not need repairs or replacement a decade from now. After receiving a couple of quotes from other highly-rated installers, we had Crystal Exteriors come to our home to take measurements. We decided on Crystal Exteriors because in addition to giving us a good price, the owner, Mr. Edgar Li, impressed us as being experienced, informative and professional. There were no games or gimmicks, he was very straightforward in terms of price and information.  The installation exceeded our expectations as well. Mr. Li does not subcontract, his crew is very efficient and skilled and they have worked with him for years. It is clear that Mr. Jaime and another crew member take pride in their workmanship. They took great care to isolate the area around the door with a floor to ceiling plastic drape and worked with great care and respect for our property. Years ago, I used another highly-rated firm to replace our sliders, and while their crew did a good job, they did not isolate the area the way the Crystal Exteriors crew did. Mr. Jaime and his crew go the extra mile. Not only did they replace the visible wood rot around the door, they also replaced hidden rot that they found in the subfloor. They did all of this additional work with absolute thoroughness and for a surprisingly low minimal cost.  To say that we are happy with their work is an understatement. We are beyond pleased with the quality of our door as well as the outstanding experience we had with the installation. In addition, we noticed immediately how much more energy efficient the ProVia door is and that alone definitely makes the upgrade worth every cent. Crystal Exteriors also replaced two windows with ProVia windows and they are extremely energy efficient compared to our original windows.

Laura N. of Silver Spring, Montgomery County, MD 20906
(Found on CheckBook.org)

We used Crystal Exteriors to replace our entry door with French Doors and a transom window above the door. The new doors and transom window look stunning and actually exceeded our expectations! Working with Edgar Li, the owner of the company, was a real pleasure. He is friendly, knowledgeable, and very responsive to all questions and concerns. He and his team delivered the highest quality work and service and we will happily work with them again.

Ellen M. of Potomac, Montgomery County, MD 20854
(Found on CheckBook.org)

If you want the job done right and every detail taken into account than you want Crystal Exteriors. My home builder installed an entry door improperly in the opening of my home which allowed in water and air damaging the door frame. Mr. Li came out personally to examine and measure the opening for the new Provia door and took on the task of chopping out the old concrete step and pouring a new one so the door fit properly. All of this done on time and at a reasonable cost. I happily recommend Mr. Li and will be purchasing a new Provia patio door from Crystal Exteriors.

Lori T. of Silver Spring, Montgomery County, MD 20906
(Found on CheckBook.org)

I like to start out by saying that I have been a wholesale distributor for Provia Door products for over 10 years. When I decided to get the doors on my personal home replaced, I chose Crystal Exteriors. Edgar and his team are absolutely the best. His attention to detail is second to none. When you hire Crystal Exteriors you are dealing with the owner of the company. He personally deals with all aspects of the job from the design to the installation. He approaches the business like a design consultant and not like someone trying to make a sale. He treated my home like it was his own. Absolutely the best.

Ryan G. of Rockville, Montgomery County, MD 20850
(Found on CheckBook.org)

Crystal Exteriors removed and replaced both 1987 patio doors leading to the deck and the the basement. The 2 workers have 15-20 years of experience just installing and replacing doors, so they easily took care of any issues they encountered during removal/installation, and both doors were removed/installed the same day.

Sarah S. of Clifton, Farifax County, VA 20124
(Found on CheckBook.org)

Edgar Li helped me select a quality entry door for our home. I had difficulty deciding on the appropriate color and design. He provided me with numerous pictorial samples and quotes and recommended that I get two sidelights to brighten my small front foyer. He was correct. With the extra lights entering the foyer, it now looks twice as big, yet the privacy is still there. Edgar Li was patience and professional from start to finish. I would gladly recommend Crystal Exteriors to friends and neighbors for quality entry door sales and installations.

Kim P. of Potomac, Montgomery County, MD 20854
(Found on CheckBook.org)

We had an excellent experience with Crystal Exteriors. Edgar Li, the president, was always available and checked on the work every day. His advice and suggestions were excellent. We were notified when each section of the job (siding, roofing, gutters, doors) would be started and completed. All the crews were very experienced, worked hard and tidied up when finished. There was not a moment's worry on our part. Edgar also did extras that were much appreciated (relocated backdoor light, added a porch outlet, changed the garage frame). He recommended and used the highest quality materials. The price was very reasonable, but the value was superior. Highly recommended. First, the best professional advice (from Edgar Li) that we have encountered. He is a graduate engineer, very smart, very experienced, very dependable, always reachable, very quality conscious, very responsible for the quality of the work performed. Could not ask for more. The workers have been with him for years and we watched them in admiration. The work was performed sooner than anticipated. The quality of materials chosen was tops. We were very glad to have "discovered" Crystal Exteriors. We were frustrated in finding an excellent contractor. We had had offers that ranged from one-half to twice as much as what we paid. Most importantly, we had zero confidence in the people that were making those offers. Edgar Li is top notch. We had not met anyone like him.

Edward K. of Bethesda, Montgomery County, MD 20817
(Found on CheckBook.org)

Edgar was fantastic to deal with. Our door was warped upon arrival, and Edgar immediately ordered a new one and did not accept payment until we were completely satisfied. His team was excellent. Dealing with Edgar and his team was easy and they were all very professional. Highly Recommend!!!

Joan A. of North Potomac, Montgomery County, MD 20854
(Found on CheckBook.org)

Edgar and Crystal Exteriors are truly exceptional. He brings to mind the quality craftsmanship of yesteryear, where expertly trained carpenters really care about the quality and appearance of their work. We had two exterior doors replaced, and the installation was both efficient and very surprisingly clean - one of the crew members spent considerable time just cleaning up, sweeping, removing old woodwork and hardware, etc. We couldn't be happier with the job, and heartily recommend Crystal Exteriors to anyone needing their services.

Dennis G. of Rockville, Montgomery County, MD 20853
(Found on CheckBook.org)

I cannot say enough positive things about this company. Edgar Li and his staff were truly professional and did an amazing job. They completely cleaned up the areas after the job and were careful not to damage my walls etc. while removing the old doors and installing the new. He is the best contractor I have ever used. He was in touch every step of the way and worked around my schedule to install a beautiful ProVia front door and 2 deck doors with internal blinds. The product and labor were excellent. Mr Li came out to check the work after the crew finished to make sure everything was done properly and I was totally satisfied. His price was fair and less than another estimate for the same doors. I would absolutely recommend Crystal Exteriors.

Deborah D. of Fairfax Station, Fairfax County, VA 22039
(Found on CheckBook.org)

Edgar Li is the consummate professional. Very thorough communication throughout all stages of the process. I had them install an entry door and two sliders One of the sliders had a small manufacturing defect, and he was able to negotiate from the manufacturer a free replacement or a cash rebate. Months afterwards, he was willing to drop off flashing samples so that I could match paint. His willingness to help long after the sale was impressive. Highly, highly recommend!

Jim S. of Arlington, Arlington County, VA 22209
(Found on CheckBook.org)

I chose Crystal Exteriors because of the attention to detail and product knowledge shown by its owner, Mr Edgar Li, when he provided an estimate. He was very responsive and helpful as we worked to get the right doors for our house. Once we decided on the doors, he kept us updated on their construction and delivery. His installation crew was extremely professional, hard working, did an excellent job keeping construction debris out of our house, and a superior job site clean-up. Mr Li is without a doubt the most competent and trustworthy home improvement contractor I’ve ever hired.

David H. of NW Washington, DC 20011
(Found on CheckBook.org)

Edgar Li was the fourth and final provider that provided us an estimate to replace three of our exterior doors: Front door, back french doors and back patio door. He was communicative, punctual, and straightforward. He was able to meet the least expensive estimate, but I felt that he was more detail-oriented than all of them as well. His installer is an employee and has been for several years. He was here all day, installing the two back doors. He ensured that the space was tarped off, so that no dust could get in the rest of the house, and that it minimized inconvenience. Mr. Li stopped by a few times to check in the work - everyone was fantastic. The installer came back on another day to do the front door, as it was special ordered and needed to come in. This time there were two guys, and my double front doors became one beautiful door with sidelights. I most appreciated the attention to detail and level of customer service that Mr. Li and his employees provided. This is a small, local, well-run business, and it was a great experience all around.

Pamela R. of Silver Spring, Montgomery county, MD 20905
(Found on CheckBook.org)

Edgar Li did an outstanding job of installing a Pro Via single metal and double fiberglass French patio doors in January 2015. The workmanship was outstanding. Mr. Li is a very fine businessman,very knowledgeable of the products he uses and very thorough about explaining options and best product for a specific area. He responded quickly to our inquiries and completed the work on time. I plan to have him install shutters soon.

Virginia K. of Potomac, Montgomery County, MD 20854
(Found on CheckBook.org)

Wonderful experience with Edgar Li of Crystal Exteriors! We had an improperly installed and oddly sized entry door that needed to be replaced. I worked with three different installers, none could find a door that matched our contemporary style or budget (one quoted me $11,000 for a fiberglass door!) and none was willing to work with me to find a solution. Mr. Li found us a beautiful modern Provia door that was reasonably priced and his team did a great job of installing it, including fixing existing problems with the siding and trim. The best thing about working with Mr. Li was his responsiveness, he answered my emails promptly and patiently explained our options. He was quick to provide the quote and samples and came back himself to make sure everything was perfect. Would absolutely recommend using his company.

Emily P. of Arlington, Arlington County, VA 22207
(Found on CheckBook.org)

Edgar Li helped us previously with a big window replacement job, roof replacement, and siding repair for the sale of a family home, so I was completely confident in calling him again to replace our sliding door to the deck. In all instances, he and his crew have been excellent: in describing good quality options for the best price, in communicating and honoring an established schedule, and in performing the work. Top notch, honest, and great to deal with all around.

Sandra M. of Rockville, Montgomery County, MD 20853
(Found on CheckBook.org)

Edgar is superb! He was timely and responsive throughout the discussions about what to do and which door to use. He followed up quickly to schedule a time, and even sent me email reminder. His crew was punctual, courteous, careful in their work and thorough in their clean up.

Margaret M. of Takoma Park, Mongomery County, MD 20912
(Found on CheckBook.org)

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, Montgomery County, MD 20877
(Found on CheckBook.org)

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.

Nannette B. of Silver Spring, Montgomery County, MD 20901
(Found on CheckBook.org)

I cannot say enough good things about Crystal Exteriors. The owner came twice, perhaps 3 times (I don't recall exactly) to be sure all details were covered.  While I was deliberating whom to hire, he kept in touch, whereas no other company did, although others seemed very competent too.   He pointed out details and possible improvements that no other company did.  They did not charge for repairs a small area of rot when the original siding was removed. They also repaired an original attic air vent, again without charging me. And he suggested wise aesthetic improvements such as moving cables to the side of the house where they would not mar the look of the front of hte house.  Every day the place was picked up and tidy. And I was always notified if they could not come because of rain. I could have chosen another company, but this one made me feel I could sleep at night knowing everything would be done correctly.  I've had other work done and months or years later learned it was incorrect. This has placed the burden on me to learn about the work in question (such as porch flooring) in order to be able to assess whether it is being done correctly. Fortunately, I did not have to do this with Crystal Exteriors. Peace of mind was worth everything!  And the house looks fantastic.

Alex K. of Silver Spring, Montgomery County, MD 20910
(Found on Angie's list)

So start your home remodeling today!

Whether you’re interested in windows, doors, siding or roofing, our experts are here to help. Feel free to get in touch with questions or quote requests and experience Crystal Exterior’s customer satisfaction.