Sergey and his team did a fantastic job installing our sliding door. Very friendly and do quality work. Would highly recommend!

This is a little odd to say up front with a 5 star review, but we didn't end up having our windows done by Bestoff. We took over a half-dozen bids for a to-the-studs siding teardown and Hardie board replacement, using the opportunity to replace 21 old single pane windows and two sliding doors with new construction windows & doors. Of everyone we talked to, Sergey was hands down my favorite. If we were just doing with windows, we absolutely would have gone with Bestoff. The only reason we didn't go with Bestoff was out of their control: we ended up going with a singke business that does both siding and windows rather than splitting the work over two contractors. With that out of the way, here's why I liked Sergey so much: He's real. He's not a salesperson. He listens to understand what you want, but he takes pride in his work and he has a perspective (that he'll share with you) on what to do with your windows to bring out the best in your home. Most folks who came out just asked us if we wanted to keep our sliders in the same configuration. Sergey was the only one who went through each room, truly thought about the air flow and the aesthetics, and provided recommendations on each configuration. He acknowledged it was free advice, and it was -- we're going to follow his recommendations because they make sense, even though we never would have considered them before (and nobody else suggested them). And because Sergey takes pride in the outcome of his work, and not on his upsells, he never pressured me into any unnecessary frills. In fact, any time I considered a "premium" upgrade option, Sergey talked me down and explained why I didn't need it. For example, my head started spinning over energy efficiency and fire protection. I was debating SunMatrix/Quadratherm it's SunShield/Quadratherm for our south and west windows. Sergey was the only bidder to really take me through the pros and cons and ultimately make the case that, for this project, I shouldn't bother. Similarly, I emailed about WUI-compliant tempered gas after I realized I'm only 3 houses away from a high fire danger zone. I waited to know if it was worth getting the WUI glass. Sergey was the only bidder to go over the pros and cons in detail and explain why it would be an unnecessary expense for us. When when I let Sergey know we chose to go with a combined siding/windows contractor, he gave us even more advice on things to look out for to protect ourselves. If you're looking to do a substantial window project, give Sergey a call. I'm trying to manage my deep regret at not getting to work with Sergey. I'll feel a little better if I can imagine playing even a small part in another family getting to work with him read more

We hired Sergey and Bestoff Windows to replace every single window in our home and couldn't be happier with how it went. They were noticeably more affordable than the other bids we got and there were no surprise charges along the way, which seems rare with home improvement projects. Everything was transparent and laid out up front. They showed up exactly when they said they would, and communication was excellent the entire time. Every question we had got a quick, clear answer, and we always knew what to expect next. Didn't have to call multiple times or send a bunch of emails. The new windows look fantastic the crew cleaned everything up after the install. No dust in the house or materials in the yard. We have recommended Bestoff to a few friends already. If you're looking for a window installer who's fairly priced, dependable, and respectful of your home, we'd recommend them without hesitation. read more

Sergey, the owner, was delightful when he came to give me an estimate. I liked that he made suggestions about changing a few things about the windows. His was also the lowest estimate of three. The crew that came to install the windows came on time (a little early) and got to work. They replaced all of the windows in my house in one day. The worked hard and were considerate to me. read more

Overall great experience with BestOff Windows. This was my second time using Sergey. Everything was smooth and as expected. Communication was clear. Highly recommend! read more

Bestoff Windows just completed replacing my living room patio glass sliding and screen doors, living room window and half-moon window, and my 2 kitchen windows. Worked with Sergey who gave me a fair price and his installation crew did a fantastic job. They were in and out in just 3 hours. I'm very satisfied with this company and highly recommend them to anyone looking to replace any windows or sliding glass doors. read more

Extremely pleased with the project done for my house in Walnut creek this summer by Bestoff Windows . Everything looks great and I'm saving money on PG&E bills with my new dual pane energy efficient Anlin windows . The best out of it is the sliding door with a built into the glass pet door for my dog to go in and out without bothering me all day long )))). My wife likes the most that outswing French door for our guest bathroom with the contemporary nickel hardware . Highly recommend,extremely competitive local business. The crew leaded by Alex is well oiled team-fast,professional,detailed and efficient work. Five stars no doubt. Also looking forward to get the federal tax credit for my new energy efficient windows installed with my tax returns in 2026. Thank you,guys. read more

BestOff Windows Inc - Windows Installation Near Me - Concord, California

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Sergey and his team including Alex were amazing for the entire process. We hired them for 3 large sliding doors and 6 windows and the entire process was so easy and affordable! Sergey came within a day of reaching out to him. He gave me the lowest quote out of 4 companies and he was very knowledgeable. Alex and his crew came to install everything and were done within a day. They were nice, professional and left everything very clean. You can tell they take pride in their work. Alex even took out time to listen to my kids magic tricks while working. Would highly recommend them! read more

We recently replaced all our windows and patio door, and Bestoff Windows did an excellent job. The entire project was completed in under two days, and everything--from the initial assessment to installation--was smooth and well organized. Sergey, the owner, is great to work with--very straightforward, no sales pressure, and no upselling. His crew was professional, efficient, and paid attention to detail. They came highly recommended by our neighbors, and they absolutely delivered. Highly recommend! read more

I highly recommend BestOff Windows. Sergey was professional and kind. He explained the product and installation process thoroughly and clearly. The 3 men who installed our sliding glass door were amazing. We are very pleased with the service and the product. We will stick with this company for future door and window upgrades. read more

Much Thanks to BestOff Windows for the professional expertise and painless process of installing 10 replacement windows and 1 sliding patio door to my home. Sergey the proprietor is the one to contact for a stress free initial consultation, who explains all window options to the "well oiled machine" removal and installation team of Alex and his crew of two in six hours or so. Highly recommend the personalized service with a smile of which BestOff Windows provides with 30 years experience read more

These guys were a pleasure to work with. They came out and reviewed the situation, gave me information I didn't consider, and worked with me on pricing and payment timelines. Would happily do business with them again. read more

If you need new windows and sliding doors, I highly suggest BestOff Windows. Sergey and his team provided professional, punctual, and experienced window installation at a significantly lower cost than their competitors. I received 3 separate quotes from window companies I found on Yelp. All 3 companies gave quotes on Anlin-branded products, as the only window product I have ever heard of is Anderson Windows due to their heavy marketing. What separates Sergey and his competitors is: - Sergey spent time providing a lot of suggestions that would help air flow and aesthetics with just small changes in what direction the windows should open. - Sergey sat down with me, going through Anlin's catalogue to show what products they offered and the suggested products for my house and budget. Other vendors just told me to look at Anlin's website. - Sergey is very honest and upfront about what he does and doesn't do. He is "old-school" and is not a salesperson who flatters you to upsell you on products and services. I can see some people being upset about him not working on certain projects, but he sticks to what he knows and what is profitable for his business. This allows him to offer highly competitve pricing with quality work. Originally, because of budget, I asked for a quote for 5 windows and 2 sliding doors. BestOff was significantly lower then the other 2 quotes that I recieved, that I asked Sergey to give me a quote for all my windows and sliding doors, 14 windows and 4 sliding door. The quote for this was only slightly higher then the other 2 quotes I received from the other 2 companies for the 5 windows and 2 doors, and for the same Anlin window product. I believe Sergey is able to do this is he ONLY does window installation and reduces additional costs of doing everything. Also I don't think he applies the ZIP Code based quoting. - Sergey doesn't offer any financing products, but he will work with your financial needs. Before I recieved BestOff Window's quote, I inquired about financing programs with another company I received a quote for. I was sent a link that said it would not sell my information or affect my credit standing. I entered some simple information that included yearly income and contact information. It did not ask for SSN, so I fet it was ok. I ended up getting so much credit SPAM emails, at least 3-5 a day from several different companies. It left a bitter taste in my mouth, which I kind of glad it did because it gave me a chance to get a quote from BestOff/Sergey, get all my windows and sliding doors replaced, and save a lot of $$$. So ofcourse I was slightly nervous before installation, that there had to be something wrong with BestOff Windows, because how is Sergey able to provide such a highly competive quote for the same window product as my other quotes. But my nerves and fear were taken away, as Sergey's team provided highly professional and experienced work. Alex, lead installer, and his team showed up promptly at the given time on each of the 2 days of installation. They work fast and effieciently, while being detailed and clean. I can see Alex is highly experienced and each person had their specialized role in the installation depending on each person's experience and specialization. I have had other work done, including changing out 2 windows, a few years back, and I can see that Alex and his team had a effective system versus randomly installing windows, leaving room for error. It only took BestOff less than 2 days to change out 14 windows, 4 sliding doors, and some siding/trim repair due to dryrot. It took a previous contractor 3 days to repair some dry rot and change out 2 windows. Alex clearly showed expertise in his work. His team also did not leave a mess and cleaned up, unlike some other work I have received from other contractors. Unless I find reasons in the future, I highly recommend BestOff Windows for their quality of work and pricing! read more

I just had new windows installed in my home by Bestoff Windows and couldn't be happier, it feels like a new home with the look and quality of these windows, from start to finish this has been a great experience with this company especially the owner and installers. read more

Got the windows and slider that I needed replaced for a reasonable price. Installation went well and I am still happy I chose BestOff over a year later. read more

I greatly recommend Sergey and BestOff Windows. We have a rental that needed all the windows and sliding glass doors replaced. BestOff's quote was significantly less than Home Depot's, the wait time for the windows was shorter, and Sergey and his team were personable and easy to deal with. We are very happy with the process and the final result. 5+ stars! read more

All my house's windows and patio doors need replacement after 40 years duty. I finally chose Bestoff as the vendor after comparing three quotations. Sergey gave some good suggestions on changing operation directions for certain windows. All those changes really improved the airflow after completion. I am pretty sure that I could save money in my future PG&E bill. Alex led two men to complete the site-work efficiently and with very high quality. They are really professionals in window installation. I am pretty happy with my decision to replace all the old windows and patio doors...and more luckily, I have chosen the best vendor to do it. read more

BestOff Windows Inc - I love this garden window most! Great job! - Windows Installation Near Me - Concord, California

I needed several windows replaced in my home and reached out to this company based on good reviews and a referral from a neighbor. Sergey came out for the estimate. He mentioned they install Anlin windows, a brand I was unfamiliar with, and provided a quote--but the quote did not specify which Anlin product line would be used. I specifically mentioned we have noise issues and needed sound-reducing windows. While drafting the quote, he said he had forgotten to include that and would update it. Later, when I did my own research on Anlin and asked him to clarify which exact window would be installed and whether the sound package was included, he abruptly refused to provide any clarification. He simply said there wasn't enough money in the project for him and told me to find someone else. This is completely unprofessional. If you're not serious about a project, don't waste a homeowner's time by spending an hour in their home pretending to work up a quote. Transparency and follow-through are basic expectations--this company fell short on both. read more

Sergey was great to work with. He was friendly, informative and efficient. He gave us the best price of all our bids, was flexible with the install, and completed the work promptly and satisfactorily. 5 stars! read more

Great experience working with Sergey to replace the windows for my house and my parents' house. It was a game changer to replace the windows. I could feel the difference for weather and sound. If my neighbors are too loud, I can close windows and they are effective for noise cancelling. Also kept the house cool in the summer, warm in winter in comparison to old windows. They are also easy to maintain so I don't have to clean the outside of windows too often. Pricing is also reasonable and competitive. Sergey is a real one and is transparent and sets realistic expectations. Highly recommend read more

Yelp wins again - hard to argue with these reviews, as Bestoff completely soared over all of our expectations when it came to window replacement. I think we probably would have had it done 20 years earlier if we'd known what a pleasant experience it would turn out to be. Sergey stopped by our place to do an estimate on replacing the 9 main windows in our 1972 Dana Estates tract home. We still had the original Likit windows that were installed when the home was built, which Sergey schooled me on - I never imagined a window guy who knows the history of his craft. Also, in case any of you harbor any resentment against us Eastern Europeans in the wake of Trump - we're actually very good people, and I'd happily vote for Sergey to represent us were there an election for that kind of thing. Sergey left us with insanely fair estimates and the brochures for 3 brands of windows. We decided to go with Anlin based on quality, their being a local company based out of Clovis, aesthetics, and the double-lifetime warranty that can be transferred should we sell the house. The work was done within 2.5 hours (we cleaned and got everything away from the windows beforehand) and they left the place so spotless I'm now in the market for my own shop vac. The windows are *bangin'* and they make our place look like a completely different home. We can't stop commenting on them. THANK YOU Bestoff team for providing the best work we've had done on our place to date! read more

BestOff Windows Inc - Before (Inset) and After - Anlin windows - Windows Installation Near Me - Concord, California

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I have used Bestof twice over the last 8 years and been very happy with their service, quality and cost.

Sergey and his team were fantastic. He was very knowledgeable, outlined the pros and cons of different options, and provided a reasonable price. Alex then led the installation, and they did a fantastic job. They had good attention to detail, corners were flush, everything was caulked and painted. We didn't just install prefab windows, but also built out new window framing. And it looks great. We now have bigger windows with better heat retention and more light. Highly recommend! read more

Bestoff Windows did a great job from consulting to pricing to install everything was smooth. The owner provided insight and recommendations which made a huge difference. Highly Recommend! read more

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Sergey and his crew did an amazing job installing beautiful Anlin windows. We called, had a quote in a matter of days, and then ordered 18 windows. The windows came in about 5 weeks and were installed in one day. The crew came back and did final touch-ups the next morning. The cost, experience, and process was smooth and we would definitely recommend this company to family and friends! read more

BestOff Windows Inc - A bedroom window. - Windows Installation Near Me - Concord, California

Got some work done before the holidays. Great price. Great communication. Great job. I'd use these guys again Thank you read more

Sergey and his guys are phenomenal! We recently had 9 windows and 1 Sliding Glass Door replaced by them. We still can't believe how much this changed the beauty of our home, both inside and out. Besides that being a value in itself, the real value is in the quality of work performed, the customer service they provided from start to finish, the finer details (finishing) never being missed, and the pricing being more than fair/reasonable. Alex, our installer, arrived early with the rest of his Team on our appointment date. They were prepared, organized, and very professional. This is the 2nd time we've used Sergey and Alex to replace windows in our home and why we won't use anyone else. They're so good at what they do. Thank you, Sergey, Alex, and Team for the wonderful work you all do. read more

Sergey (BestOff Windows) is great to work with. He spent plenty of time with me to be sure I understood the product line I was purchasing. His quote was considerably less than the other two quotes I got. Turnaround time was to be about four weeks, but my sliding patio doors were ready to install five days early. Alex and his crew were on time and finished earlier than expected. The project is beautiful. Oh, did I mention that one of the sliders has a built in doggie door! read more

In May I reached out to Sergey for an estimate on replacing 50+ year windows at my mom's house. He was great! Listened, gave advice, was humorous and professional. The estimate was spot on, but mom was still deciding. Fast forward to Oct when she agreed to replace. He remembered us, honored the quote, and got things rolling. 14 windows (including a large slider). 1 day replacement. Everyone was professional, efficient, and clean up was fantastic! I couldn't ask for a better install. Now she has no drafts and I'm hoping to see some improvement in the utility bills. Would totally recommend! read more

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Quick and easy. Fair price and very professional. Would definitely recommend!! Installers were clean and respectful. read more

BestOff Windows Inc - Windows Installation Near Me - Concord, California

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Sergey is the best. He took the time to walk me through all the options, figure out the best configuration for our needs including many practical suggestions. He was very thorough in answering all my questions. And the installation crew was top notch too. Highly recommend. read more

After weeks of research and having 8 different companies come to give me estimates I literally said fk it and was about to give up. At first I narrowed it down to 3 companies (the other 4 were ridiculously expensive, they wanted 25+ grand for 11 windows and two sliders- sheesh) the three companies were CDW, AVW, and I forgot the other. CDW's salesman was actually really polite, but he was for sure a salesman, and I actually did like their product but 1) they were the most expensive of the three 2) they had horrible reviews 3) the call back guy was a fucking asshole. Period. He was disrespectful and kept throwing racist dog whistles AND told me if I wanted cheap windows to just go to Home Depot and have Jose do it- fk you pal I'm half Mexican and have an uncle named jose. Anyhow I told him what he could do with his windows. AVW- great reviews- the salesman was a nice guy but would Not budge on the price- he offered Amlin windows, 11 windows and two sliders for close to 18 grand and that's with some special they had. I told him I'd think about it. The other company actually had the best price out of the all of them at that time but after researching the brand he was selling I figured maybe I should just pay the extra three grand for a better product. This company also had good reviews but had some issues with new ownership and license #'s but it seemed to be fixed. So I was about to give up for the time being and put that money to a different project but then I came across Best Off Windows. Sergi, the owner came over on time and was actually a pretty cool guy. He gave it to me strait up. No sales pitch, just friendly, and gave and honest opinion about the two brands he was selling and their pros and cons. He measured the windows ( I only wanted the back windows bc that's where the sun hits and where my master bedroom is) and then gave me a quote. His quote was not only the most competitive but he offered the exact same product that the AVW guy was selling- for like 3 grand less. So of course we made a deal right then and there. A few hours later I thought since he gave such a good deal for a quality product, why not just get all the windows. So he came back, measured, gave a quote and we sealed the deal. He told me it would take 6-8 weeks and they came in 6 weeks! It was a three man crew. The finished upstairs first and then some downstairs on the first day and the second day they completed the project. They did an excellent job! No complaints! My house is much much much cooler now! Fkn fantastic. My neighbor has already called to order two sliders and my other neighbor said he was jealous. Lol. I definitely recommend not only for the competitive pricing and the quality product (Anlin) but because I like the owner Sergi. What most businesses fail to realize is customer service can make or break a deal. And he made the deal without pushing me. Anyway- pics are included. read more

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We contacted Bestoff for replacement windows in our 92 year old home. The windows were a mix of the original wood frame windows, many of which were painted shut. Aluminum sliding windows, which often rattled and leaked air. And leuvered glass slats, which leaked the worst of all. Not to mention, the lines on the slats were visually distracting and not very nice looking. We were looking to replace seventeen windows. Sergey's evaluation was friendly and professional and his estimate was very reasonable. After a bit of a wait (which was a bit slower than usual due to the current supply chain challenges), Sergey's team came to our home for installation. They were, as Sergey had been, friendly and efficient. After five hours, the windows had all been replaced without issue. We're really excited about the improved energy efficiency, style, finish, and noise reduction. So far, we've already seen a dramatic reduction in noise, and we're looking to see the results of the energy efficiency gains. We very strongly recommend Bestoff for window replacements in the bay area. read more

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Incredibly happy we went with Bestoff windows! We loved every step of the way. The owner/sales person (Sergy), was kind, funny, knowledge and trustworthy. We are very appreciative of our experience with them! Thank you! read more

Highly recommend. Sergey was very helpful and informative, and price was competitive and reasonable. Our house was built in the 1970s and still had the original windows and patio sliding door. Single-pane, let noise in, no temperature regulation, condensation, some mold we could never clean off, and difficult to open/close. We wanted at the bare minimum to replace everything with dual pane Anlin, but also had some ideas about maybe changing the style, or converting one window into a second sliding door to the backyard. We received an estimate from another company that first, was more expensive; but second, the salesman basically said Yes to everything. Sergey was the opposite: he told us what could be done, and what could happen as a result, and pointed out some things that had us rethink our ideas. For example, we inquired about the conversion of window to door. He measured. Yes, it could be done. But should we do it? How often would we use it? Our neighbor's fence is quite close, and would we feel as if we were giving up privacy? Did we expect to keep the blinds closed most of the time, in which case we wouldn't even see the doors often? Would they let in too much afternoon sun and in fact, make the room even warmer when we were trying to regulate the temperature? Another thing he helped us with was actually changing the direction one of the windows opened, so that when open, the air flow worked in tandem with a window that was across the room and helped cool the room more efficiently. He gave us lots to consider, and actually saved us money since he didn't try to upsell us on our (now silly) idea of converting a window to a door. Turnaround time was just a few weeks, compared to another company that was a few months out. His crew was professional and completed the work in just a few hours. We're very happy with our new windows and definitely have felt an improvement in the air quality and temperatures in our home! read more

Had the chance to meet Sergey (owner) when he came to provide me with an estimate to replace all my windows and sliding doors. He is very pleasant to talk to and was eager to share his knowledge about windows. We briefly talked about my project and the Anlin brand I prefer to use as well as a glimpse of his personal life which he loves to share. Unfortunately, his company does not offer any kind of financing like 0% APR or deferred pymts for a period of 6-18 mos that most consumers take advantage of like me especially on a project like mine. Currently, still on the fence as to using his company or not and will update this review if I do. read more

I've NEVER been treated so RUDELY by a business as Sergey did today. I called him yesterday after getting great reviews about him from 2 friends. We spoke on the phone yesterday to book the appointment for this morning to discuss my patio slider. He said he didn't work on Saturdays but he would make an exception and come out to take a look. He arrived and said "You have all new windows. What do you need?" I said "I want to repair the patio slider" He said " YOU'VE WASTED MY SATURDAY." We don't do repairs. We're a construction company. We only do installations. And he walked out of my house. I said "How would I know that? I want to know what my options are." I explained that the slider was good but the seal is bad and he said "No, goodbye" turned around and left. He wasn't even in my house a minute and a half. VERY VERY VERY RUDE. read more

Couldn't be happier! Great service all around. The bid was very fair. And the service over the top. I wanted to know more about the warranty before moving forward, and the owner of company texted me the direct link. Once we decided to move forward he remeasured and discussed with me changing the slide open side for better airflow in the home, and showed me choices for privacy glass. Long story short, as a real estate broker I am very familiar with several window companies and I have to say, Bestoff Windows is terrific and a pleasure to work with. read more

Truly kind professionals, great pricing and efficient. The owner came to our home, was transparent with which windows needed to be replaced and which were just fine to keep. The crew was so fast installing 7 windows and a sliding glass door. They completed it under 5 hours I believe. Great local company. Would highly recommend! read more

Have done multiple projects with this company and up untill now have always been very satisfied. On my home i have some issues with the caulking within the first year. It seems to have shrunk and is showing cracks. Instead of just recaulking Surgay blamed the painter for not painting 1/16 onto the vinyl window trim. He then started yelling and made a big scene in front of my home. Later in the evening sent a nasty text stating he is not a handyman and he is not responsible for the caulking, his caulking on his home is fine and its not his problem. Very disappointed in his professionalism and lack of care for customer satisfaction and my home. He might have good prices but he no longer stands behind his work. read more

BestOff Windows Inc - Windows Installation Near Me - Concord, California

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