Smart, resourceful, and friendly. Great problem solving to fix an old install with minimal disruption.

A great experience with Vitaliy. We needed an old shower door replaced. He responded to our inquiry on a Saturday right away - quickly gave us a quote - and came out quickly after that to take measurements. One week later the door was ready and installed. Everything was efficient, handled with courtesy and expertise, and faster than expected. You can stop looking any further for a glass guy read more

I'm so grateful that I discovered Vitaliy Tsertseil and Knock On Glass. From the very beginning they were responsive & simply terrific communicating throughout the project. We have a 115 year old house with the original heavy doors that had 5 wood insets each. To open up the space a bit, without taking down walls, we decided to replace the wood with glass. Vitaliy came over to see the doors, take measurements, discuss appropriate thickness, types of glass, width of bevel etc. I immediately felt so comfortable with our choice of his company, he's just so knowledgeable & easy to work with. The 17 pieces of beveled glass were done ahead of schedule & installed today. We are thrilled with the results & I'm immensely grateful for just how lovely Vitaliy was to work with. read more

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Finding an honest glass installation company is hard to find. I've worked with numerous over the years, and knock on glass has been the best. They were straight forward, honest, efficient, and knowledgeable. They had to modify project midway to accommodate our situation and handled it well. I'll only be using them going forward with any glass projects I have. read more

Vitaly did an excellent job with the custom glass top for our extremely long wall mounted console. His response time to emails and calls was quick. He was very professional, providing prompt invoices and confirmations. His pricing was competitive. The glass was done ahead of schedule. Vitaly carefully fit the glass into our apartment building's small elevator and cleaned/installed it on site. He was delightful to deal with and I wouldn't hesitate to recommend Vitaly or contact him for more projects. read more

Vitaliy is just phenomenal. His response time is prompt & professional. I hired him to install a shower door in a new apartment that I purchased. Installation time was approximately 1.5 hours. I contacted another company and still have not heard back from them. In that time frame Vitaliy measured the shower dimensions and installed the door. It was such a seamless process. Thank you. Total cost = $2068 read more

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From my initial contact with Vitaliy to the installation of my glass shower door, I must say that my experience was smooth and exceptional. The service was phenomenal!!! He is a very timely, responsive & professional. I couldn't be happier with his recommendations for my alcove shower. It was worth every dollar spent. I will definitely use "Knock on Glass" for future projects and totally recommend him for yours. Thank you again!! read more

Knock On Glass - Glass shower door - Glass & Mirrors Near Me - Brooklyn, New York

Vitaliy and his father are incredible. Literally answered non stop questions over email at all hours and were beyond communicative throughout the process. Their work was stellar and when there was a small issue they came back and immediately resolved it. Literally could not recommend them more. I wish I could get them to do all the work we need in our apt! read more

I called Knock on Glass to give us an estimate for a glass sliding door for our bathroom. Vitaliy was responsive, provided an estimate, completed the job on time and professionally. read more

Knock On Glass - Glass & Mirrors Near Me - Brooklyn, New York

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These guys do amazing work and very easy to work with them! I had a glass shower door installed and now my bathroom is complete. Vitaliy, the owner, responded to all my emails and phone calls in a timely manner and kept me up to date on the progress of the installation. He was pleasant and troubleshoot any problems that I did not even foresee. Price was comparable to the other companies I got quotes on and they responded with a quote within a day as oppose to other companies who took many days to get back to my emails. The glass shower door arrived faster than quoted, about 1 week which was a nice unexpected surprise. Overall, a very easy and seamless process. Highly recommend these guys for any glass needs!! read more

Knock On Glass - Glass & Mirrors Near Me - Brooklyn, New York

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I called Vitaliy a few years ago, based on Yelp reviews, for a glass shower enclosure in my new apartment. Service, quality, and workmanship were amazing. So wonderful, that when I return from Morocco with a cocktail table in need of a glass top, I got in touch with Vitaliy again. Again, amazing all around! Neither project was cookie cutter; The shower enclosure is in an irregular, pre-war building. The glass table top is for an antique Berber door, made into a table. Measurements were difficult, but everything is perfect. Highly recommend! read more

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Very happy with the glasses that were installed for both our shower and bathtub. I worked with Vitaliy throughout the process. He was able to get me a quote, came to take measurements and installed the glass about a week later. He communicated well via text, phone and email. After the install, he sent me pictures of the glass and waited till I physically checked the work before collecting payment. I was surprised how smooth the process was and the quality of the install. Pricing was in line with other quotes we had gotten from local glass installation companies. read more

Knock On Glass - Glass & Mirrors Near Me - Brooklyn, New York

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I am very happy with the glass shower door that this company intalled for me. Response of email: quick Price: very fair Glass shower door: beautiful as described Worksmanship: excellent Puntuality of appoinment: 100% on time Owner (Vitaliy): honest in every aspect of the process Condo requirement: able to meet condo requirement (hassel free for owner) I highly recommend this company to anyone who is looking to install glass shower door! read more

If only all companies were as wonderful as this one....we got estimates from four companies for our shower doors. Knock On Glass was the fourth and also the priciest - but the old adage "you get what you pay for" is quite applicable in this case. Also, Vitaly (the owner) and his father are *incredibly* nice. In addition, Vitaly's responses to our messages were always very prompt and he was also quite flexible re: the installation date (re: the latter, the bathroom renovations ran WAY over schedule - repeatedly - and we had to change the date with Vitaly a few times). The shower doors look beautiful and we're really pleased. read more

Fabulous! Vitaliy was great. So easy to deal with, so helpful. Our new glass shower door is gorgeous. From first speaking with Vitaliy to having him come to measure, getting the estimate, placing the order, to installation was less than two weeks. Amazing. I highly recommend Knock on Glass to anyone who wants quality work, delivered quickly and with great communication and impeccable professionalism. Thank you, Vitaliy! read more

I am somewhat reluctant to write this so soon as my new glass shower door was just installed yesterday. In a world where so often nothing goes right, Vitaliy showed it can be done right. I had a couple of other estimates, one as much as $1100 more than Vitaliy charged me. I emailed Vitaliy after reading all the positive reviews here. Within 10 minutes he responded. We emailed back and forth discussing what I was looking for, then they came out the very next day to measure. Vitaliy and his father were right on time. They measured the space and happily discussed all of the options available. I was still a bit reluctant at this point as he came in so much cheaper than other places, and he required a 50% down when he came to measure. He said at that point it would be 7-10 business days for manufacturing. (One other place told me 3 weeks). At some point in the following days I emailed Vitaliy as my building required a Certificate of Insurance for delivery. Of course, Vitaliy emailed me the completed form the next day. The last surprise was that the door was manufactured early and they could come out to install it. I think this entire process went down over the course of 10 days from the day I first emailed Knock on Glass to the day they installed it. Vitaliy and his Dad work together, and they were super professional, courteous, efficient, neat, and affordable. I know this sounds too good of a review to be real, but I assure you this was my experience. In what was an awful bathroom renovation experience up to this point, the final piece of installing a custom shower door was as smooth and flawless a process as could be. Thanks! read more

Knock On Glass - Glass & Mirrors Near Me - Brooklyn, New York

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Amazing service, they work with you and your schedule. Excellent job and Vitaliy the owner is very nice, I renovated my bathroom and they came very quickly. I recommend to everyone!! read more

Vitaliy just finished a job for my renovation project involving measurement of our shower, custom fabrication of low-iron glass doors, and installation of double-bypass frameless Cambridge system hardware. The outcome far exceeded my expectations. The shower doors were just an afterthought for me going into this, but they ended up serving as the centerpiece for our beautiful new bathroom. I had not anticipated the value that they would bring to this space. This made an otherwise nice bathroom into an dazzling one. Vitaliy was a pleasure to deal with throughout the process. He was very responsive to my questions and easy to deal with. His prices were competitive. I had considered several alternatives with comparable prices and had issues communicating with some of them. When I turned to Vitaliy, the process became much smoother, and I couldn't be happier with the end result. read more

Knock On Glass - Double-bypass custom low-iron glass with Cambridge system hardware - Glass & Mirrors Near Me - Brooklyn, New York

Vitaliy was extremely responsive over the yelp quote request feature. He examined my pictures and determined a window replacement would be unnecessary and recommended a window repair company instead (he only replaces, does not repair). Wow! I was ready to buy a whole new window. Thank you, Vitaliy! read more

So easy to work with -- professional, reliable, responsible. We were looking to install a shower door in a small bathroom. Vitaliy gave an honest assessment of what would work. Every question was answered quickly via e-mail or a quick phone call. He provided relevant documents such as the COI we needed for co-op management within hours. Between our first call and installation was about two weeks. Installation itself was fast and efficient. I wish every contractor I've worked with was as great. Definitely recommend! read more

I needed a glass shower door added and these guys did a *great* job - explained my options and made quick good work at a fair price, with attention to a bunch of little details and aesthetics. see photos. read more

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Loved working with Knock On Glass - I had a time sensitive project for my retail store that I needed asap, and the owner Vitaliy was very prompt and communicative with the quote, updates on progress, and delivery. 100% satisfied with the service, which is important when spending over $500 on plate glass!! I found his pricing to be very competitive. Would recommend and will certainly use KOG again for my future needs. read more

Absolutely 5 stars experience with this company. The owner is extremely responsible with fast communications. Very professional service with reasonable price ! The whole process from start to finish was 1 week. I would say look no further and give this company a call. read more

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Wonderful people to work with. Family owned and operated. Vitaliy came to us the very same day I contacted them. This is rare if you are familiar with how contractors work. You're lucky if they even call you back. Very professional, respectful, and prompt with their responses to my inquiry and concerns. Project was completed within the quoted time frame. Outstanding service and workmanship. I highly recommend them and will certainly use them again. A+++ for Knock on Glass. read more

Knock On Glass - Glass railing for our loft..gorgeous!! - Glass & Mirrors Near Me - Brooklyn, New York

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Highly recommend! Vitaliy is one of the most responsive contractors I've worked with. Extremely prompt and accurate communication, stands firmly by their work. Had an unexpected issue with the door, which Vitaliy addressed right away and ensured is properly fixed. Would not hesitate to reach out to them again if we need this kind of service in the future!!! read more

I need to give them a five star for the wonderful job, thanks Vitaliy and his father. I live near port authority and have been bothered with the noise outside since the first day started living here, we started to try to sound proof the windows. After endless search the sound proof companies in the city were cityproof and city quiet, obviously they were too busy to answer a phone call it always led me to voicemail. After reading the suspicious good reviews/bad reviews of those companies on Yelp I started to try simply looking for window installation companies. Thanks to yelp I found a few options and after contacting I decided to go for Knock on glass since the price and project closing time were perfect.Vitaliy quickly came measured the windows and made the windows for us for the two bedrooms, the whole thing was done within two weeks! From the view of cityproof they take usually 6 months! He works productively and responds very fast, most importantly he got the job done fast, right with reasonable price. Thanks to Knock on glass we have quality sleeps and quiet nights in midtown Manhattan. I highly recommend him if anyone needs window installation/ sound proof. read more

Knock On Glass did an excellent job on our glass shower door. I reached out to several companies when I was searching for "glass shower enclosure brooklyn." Vitaliy was the first to respond and gave me the most reasonable quote of all the companies I contacted. I really appreciated how easy breezy it was to get started on the project with Vitaliy. He was super responsive by email and phone, especially compared to other companies that took a long time to respond to my requests to schedule someone to come in and do measurements so I could get a final quote. Since the enclosure adds value to our condo, we did not have to pay taxes on shower door. Vitaliy provided the form and made everything easy on my end. If and when we upgrade our second bathroom, we will for sure call Knock On Glass. read more

I contacted them because my shower stall had a leak (installation was done by someone else). Vitaliy was responsive and helpful. He offered a flat price and communicated quickly via email and even asked to see photos and video to fully diagnose the problem. It took more than 1 visit, but his team persisted until we 100% fully resolved the issue. It's hard to find people in NYC who follow up and follow through. These guys did just that, and I'm very grateful. read more

I called them because I needed a glass top for my dining room table. They came in the same day to take measurements and their price was unbeatable. They are extremely professional and easy going. I had wanted to install a shower door for a while but I didn't feel like dealing with contractors and such but since they were already here I asked them about it. They took measurements and gave me estimates on the spot. We decided to have it done by them right away. It has been the best experience I've had when it comes to home improvement. Vitaliy and his father are really wonderful people and they respond to any questions you may have right away. Even after the job is done. HIGHLY recommended! read more

I'm going to echo what everyone else says about Vitaliy and Knock on Glass - they are the best! Their work is beautiful, on schedule and cost slightly less than the two other quotes I got. They are quick to respond and gave detailed, thoughtful answers to my questions. Very friendly, so nice to work with! You can't go wrong with Vitaliy and Knock on Glass. read more

Knock on Glass / Vitaliy did an awesome job with my glass table top. The quality is excellent and the cost was reasonable. He was extremely responsive and professional and managed to fabricate and deliver the top ahead of schedule. I would highly recommend. Thank you ! read more

Knock On Glass - Dining table - Glass & Mirrors Near Me - Brooklyn, New York

Super professional. Awesome work. On time. On budget. Vitaliy is a stand up guy, true to his word. I'm an architect and ran into a lot of problems with sub-par subcontractors on this renovation project, so Vitaliy was a cut-above-the-rest and a BREATH OF FRESH AIR. I'm really grateful that business people and craftsmen like himself still exist. I hope to work with him again on future projects. Thanks! read more

We're very happy with the glass we've ordered. Vitaliy made sure that we got a high quality product for our marble table. Very responsive as well, and the product was delivered on time. I would highly recommend. Thanks again! read more

Knock On Glass - Glass & Mirrors Near Me - Brooklyn, New York

Highly recommend. A few years ago I did a gut renovation of a condo downtown, the only stressless part was dealing with Vitaliy. The other day I contacted them about replacing the silicon and he responded immediately and they came and replaced it. This is how the service business is supposed to work. His Dad Vlad works with him and is a lovely gentleman, the apple doesn't fall far from the tree. Wish everyone I dealt with was this professional and pleasant. read more

Great job with my shower doors! Service and communication from start to finish was professional, friendly and efficient. Cost was similar to other quotes I received so they are priced fairly. In comparison with other companies I spoke to, they had the best response time and most personalized service, from the owner himself. read more

Echoing the other five-star reviews -- they are all well deserved! Vitaliy was extremely responsive to my questions, provided a reasonable quote quickly, and did the job ahead of schedule. His installers were on time and did perfect work. We love our new bathroom mirror! read more

They are the best.They called me back without an hour, I had an estimate within 48 hours, they came and checked my measurements, and a week later I had a custom made door in my shower. So polite, so quick, so clean I wish I had to do more stuff in glass at home i would certainly recommend them. Thank you very much read more

Never called me back. Vitali asked me to send him photos and take measurements, I did and heard nothing. If he looked at my photos, he would see they need replacing, desperately. Very old drafty frame, warped glass, around since my business opened. Old mom and pop shop trying to stay afloat read more

It's really refreshing to work with a company that responds promptly to phone calls, keeps appointments and communicates effectively. Although Knock on Glass is kind of an odd name for a window company, don't let that deter you. A catchy business name isn't a good reason to hire a company when you've got Yelp reviews to guide the way. Knock On Glass has 5 star ratings and nothing else. Not even a single 4 as of the writing of this review. Vitally and his father are the real deal: personable, honest, trustworthy and excellent tradesmen. They installed two windows to soundproof a bedroom on the street side of my Brownstone. Vitally's advice and suggestions worked exactly as he proposed. And, when they were finished, they cleaned up! Always a plus. read more

Vitaliy was a pleasure to work with from start to finish. The first piece was the wrong size: he had the right one cut, tempered, and delivered the next day...and the delivery guy wouldn't take a tip, saying that we were not allowed to pay for their mistake. read more