Excellent prices and quick service. Needed new windows and…read morea porch door put in. The crew came in and we're very professional. Installed and cleaned up too. They were efficient in making sure I was happy. The worker Mario answered all the questions I had. I've recommended a few people already and will definitely call them if I ever need new windows again. Thanks continental! !

I had continental windows and glass come out to do 4 glass blocks windows for my basement and…read moreprocess was good until they only put cement outside my bricks and not the inside and for my front window it was undone the rep came out again and said he only price me for the outside of the house not the inside and it was going to be more more money if I want them to finish the job when I sign the contract I paid for the installation they didn't mention that the cost was extra for inside the house. very unsatisfied and I had to hired someone to finished the job.

Certified Window replaced my Andersen brand patio door and double hung windows (5) in my…read morecondominium unit. We've went through a historically cold period in Chicago and the windows made a significant difference on the indoor temperature of my unit. No more drafts and swirling chilly air close to the patio doors or windows. All the glass is still clear, no leakage despite the bone chilling frightful temperatures outside and a couple nights of horizontal freezing rain. I'm a retired trades worker with over 30 years of experience. From my observation viewpoint the installers engaged in best practices. The worksite was broom clean when the workers left. There was some dust, but it's construction. I happened to catch a windy day in mid November, which is on me since I didn't start getting estimates until the end of September. The installation beat the first snowfall by a three days. Timing was perfect as it was an insect free experience. I had 3 estimates and Certified Window beat the other firms by a significant margin. I appreciated that they were located in the City of Chicago and have been in business since 1955, so they have a good track record of service in our community. I enjoyed collaborating with Frank Matz on the project and appreciate all of the hard work by the installers. I highly recommend Certified Window after their upgrading my patio doors and windows.

This crew is amazing - great work and great people. Thoughtful, trustworthy, reasonable and…read morehigh-quality outcomes. (*Background: After watching these guys work, what seemed like 24/7, on a complete apartment building rehab near me - it was readily apparent they're are about as good as it comes) Will absolutely be coming back any time I need their services.

I just had Thermalcraft finish a sliding patio door installation. I worked with Barry several weeks…read moreago to go over option that would fit our space and budget. After the doors were ordered and delivered, the team promptly scheduled an installation and arrived on time. the team was very professional and quick, and took the time to explain the different steps of the process as they were installing. Great team! Highly recommend!

We were in the market for a new patio door because our dogs had done a number on our old wood door…read more We worked through 3 different quotes and ultimately decided on Thermalcraft. Barry understood our needs, the price was less than some of the other competitors but not so much that I worried about quality. From ordering the custom door to the date of install was only a couple of weeks. On the date of install, Nick arrived early and got right to work. The door was installed, looks great and Nick did a great job of cleaning up. I had a question about the door the next day and Barry came out and cleared up that question in minutes. We will definitely use thermalcraft in the future!

We recently had 100 year old bay non-opening bay windows replaced with new wood casement windows by…read moreSemko. The team was very responsive to both my initial quote, modifications, and inquiries. No pushy sales pitch and open for questions and suggestions. The new windows are beautiful, provide a ton of airflow in the casement design, and have received a lot of compliments. Installation was speedy and they replaced some areas of concern in rotten sills. Family run business where owners take pride in their craft.

I worked with Jay and Hal on getting 10 new windows and they were amazing throughout the whole…read moreprocess. They came out to measure everything we needed, quoted us on what we wanted and a few other optional windows as well since we were debating on doing everything at once. After selecting the quote for the windows we wanted to get done, a down payment was made and the windows were ordered. They came in a few weeks later and two of their team members came out to install them in the morning. Everything was done quickly and professionally with care. After the install, I had a question about one of the windows since it looked like there was a small crack at the top corner and they sent someone out to look at it right away. It turned out it was just some glue residue that was attached on the inside of the window that made it look like a crack and was easly scraped off with a razor blade. I definitley recommend using Semko as they provided a very reliable service and also beat out many other window companies with their competitive pricing.

I hired this company to replace some rotting window frames that were in really bad shape on my…read moreChicago townhouse. The other window companies I talked to insisted on replacing the giant, custom windows -- but this company was able to replace the rotten wood frames with custom-made replacements that blended in perfectly with the original historical woodwork, all without the need to replace the windows. This company was very responsive--they sent someone out for a free in-person quote within a day of me reaching out, and a week later I had a carpenter hard at work on my home. I highly recommend them!

We had a bedroom window that was shot with a bb. We contacted Window Repair Group and asked if they…read morecan repair a e-gas double pane window. The owner came by to give us an estimate. Pricing was in my opinion very favorable. We proceeded to order the window always said it would take week to 10 days give or take. Ollie and his helper arrived on time and repaired the window he also went above and beyond and vacuumed the carpet before putting the bed back in place. I highly recommend this company if you have need to have your window repaired.

We needed a glass replaced on a top panel of a 20 year old double hung kitchen window, plus, a…read morecouple of latches on other windows. The process was ultra simple, yet precise and quick at a very reasonable cost. The original window measurements, model, etc are kept on file tied to the serial/model number unique to each window.

My contractor ordered windows for my house, beginning of November 2025…read more2 windows with the two little side panels, only special thing about those windows. We ask black color on the outside white on the inside first they say they did opposite way colors second order they say something else was screw up. It's middle of October 2026. I still don't have any windows they do run around does not wanna provide Windows or return money If I could, I will leave -10 star

John and his team were top notch. We dealt with this in October 2018 and had our windows for about…read moresix months. Our home required about 26 windows including double hung, picture, and sliders. John met me at my home in the late evening and provided a quote. There's no sales pitch, used car salesman tactics, demonstrations that have little real-world results, etc. With other Window companies, they push their "Cadillac" windows that give a marginal performance increase for an exponential cost. Not with Best Windows. I knew beforehand they installed Kensington brand windows. They started with the manufacturer's basic line. I inquired about the mid-level line and John provided his input on why he didn't think they were really worth the additional investment. John's pricing was straightforward. There was no "oh you get a Yelp discount" or "oops I forgot to add a window to your quote, I'll throw that in for free." It was refreshing to talk to a non-pushy company for once. We went with John and his installer Chris put them in our home about six weeks later. Took about a day and a half. His crew showed up about an hour earlier and were super fast! The windows are awesome and have already saved on my heating bill this past winter.

We bought our windows from Best Windows back in 2017, and while some seals eventually failed, the…read morecompany honored their lifetime guarantee without hesitation. John, the owner, was incredibly professional and helpful--he personally replaced the windows just yesterday. It's rare to find a business that truly stands behind its product and delivers great customer service years down the line. Highly recommend Best Windows and John for anyone looking for quality products and a company that keeps its word!

Excellent! I had a wonderful experience from start to finish. The initial consultation was very…read moreinformative. Everything about the various types of windows was thoroughly explained. I was treated with respect And not like just another sale. Production took a little bit longer due to current happenings, but as soon as my order was out of production, I was called to schedule installation. The installers showed up on time and diligently worked to make sure everything was done properly. When they were done they showed me what they completed. The windows look amazing! I could instantly tell the difference in sound and temperature in my house. Love them!

Had an appointment for 10:00 and estimator didn't show. Called the business and they said they…read morecalled to confirm my appointment and they couldn't reach me. Looking at my phone, I see their called was marked as potential spam, which I never pick up on these types of calls. Talked to the owner who said it was their policy not to show up for an appointment if it isn't confirmed. I asked what they are confirming and the owner said it was the address and what service I needed. I had rebooked for next Monday and even though I told the guy the address and service required (what is why they have to confirm) he said I still needed to answer their confirmation call on Saturday or Monday. I understand why there are so many 1-star reviews. The owner goes out of his way to not wanting to do business with customers. Steer clear of this business.