Reviews
116 Customer Reviews
Review from Gregory Z
1 star03/05/2025
I bought ply-gem windows through a contractor APCO in ********, ****. After several attempts to keep the windows from leaking air APCO agreed to replace my new windows with more new windows. The second set were worse than the first. The Cornerstone **** came out said the installation by APCO was very good and he sent my situation up the ladder to get a decision on what should be done to correct the problem. The response was that there were no visible defects in the windows and that Cornerstone would not do anything to correct the situation. So I now have 22 poor quality Ply-gem windows and I want to let future buyers know to be ware.Review from Matt D
1 star02/03/2025
Had windows installed and they do not work correctly. Bad windows but atrium will not replace them. They have walked away with my money and no issues have been solved. Do not purchase windows from this so called company. Poor customer satisfaction. Would give a zero star but you cant.
Cornerstone Building Brands Response
02/06/2025
Mr. *****,
Thank you for sharing your feedback. We regret to hear about your dissatisfaction with your windows and the service provided. We take your concerns seriously and would like to clarify the efforts made to address your issues.
Our records show that we have performed multiple site visits and services on your windows, including installing heavy-duty weather stripping, replacing flag seals, and ensuring that the windows meet the required standards for functionality and performance. As of June 5, 2024, all necessary adjustments and tests were completed, and the claim was marked resolved.
We understand your frustration, but at this point, we have exhausted all available steps to address the concerns and are confident the windows meet tolerances. If you feel there are unresolved issues, we encourage you to provide additional information, and we would be happy to review further.Thank you,
Cornerstone Building BrandsReview from Louis B
2 stars01/21/2025
******** Windows has made it impossible to successfully complete a product defect claim. While initially accepting submitted relevant information and photos of the defective product, they do not follow up or even respond to emails or phone calls. They simply fail to respond. I would not recommend that anyone attempt to do honest business with this company.Cornerstone Building Brands Response
01/27/2025
Mr. ******************** you for sharing your feedback, and we apologize for the frustration youve experienced with your claim.
Regarding your case, our team initially requested product labels to verify the windows and process your claim, but we did not receive the necessary information. However, a new case (PG-2889064) has recently been submitted, and our Customer Success team will contact you soon to assist with this matter.
We are committed to working with you to resolve your claim as efficiently as possible. If you have any questions or additional details to share, please dont hesitate to provide them.
Thank you,
Cornerstone Building BrandsReview from Marsha C
1 star01/20/2025
I want to give them Zero stars concerning their ******** window manufacturing and customer service. $23K and ************************* later, I have windows that were made wrong and weve been in an unproductive dialogue with them through Famous Supply (resellers) since early September. As a result OUR RENOVATION PROJECT CAME TO A HALT. We went with ******** because of the reputation and quality of their windows. Unfortunately, we have not experienced that.I will get an answer and a resolution one way or another. Just want to WARN OTHERS to steer clear of these windows.Cornerstone Building Brands Response
01/21/2025
Ms. **************** sincerely apologize for the issues youve experienced with your windows and the delays in resolving your concerns.
To assist you further, we kindly ask that you provide an order or reference number. You can submit this information at ***************************************************, and our team will begin researching your case right away.
Thank you for bringing it to our attention, and we look forward to assisting you.
Thank you,
Cornerstone Building BrandsReview from Colleen V
1 star12/04/2024
I had contracted them in 2016 to install French Doors with blinds in the windows in 2016; in which i do see after logging into this site that at the time they were not an ROC in *******; they installed them, and I have a 10-year warranty with them for the glass and/or any defects etc. Needless to say the lever for the blinds came off so I called them and the girl said that they did not install this door!! I said that they did and I have the paperwork and contract in my hand. She then proceeded to tell me that I would have to contact another company to repair. I said that I have a 10-year warranty and they need to honor. She then stated that since they do not install these doors and again I said in which you did that they will not be able to do anything. I am very angry as now I have to have another company come and pay them to replace what should have been still under warranty. I would not recommend this company to anyone,Cornerstone Building Brands Response
12/09/2024
Ms. ****************** you for your feedback, and were sorry to hear about the issues with your French Doors and the challenges youve faced. We take warranty concerns seriously and want to assist in clarifying the situation.
After reviewing our records, we were unable to locate a warranty claim or contract under the name and email address provided. To assist further, could you please share additional details, such as the name of the manufacturer, the dealer or installer involved, or any documentation you have? This will help us determine how to best address your concerns.
We appreciate your patience and hope to work with you to find a resolution.
Thank you,
Cornerstone Building BrandsReview from Christina A
1 star11/24/2024
We had Mitten siding put on our new home five years ago. Within the first year, the siding started to buckle on one side, also lifting on the front of the house, exposing the barrier. We contacted Mitten asking that they come out to see what was going on. They asked us to send them a sample of the siding. This would involve is removing and then cutting the piece of the siding - as they said they did not want to receive the full length of the piece - then mailing it to them at our own cost. We emailed them a few times regarding this issue, asking if they would send someone out to have a look. They have chosen to ignore us. **** ***************Cornerstone Building Brands Response
12/06/2024
*********, We are sorry to hear about the concerns you’ve experienced with your siding. At Mitten, we strive to provide quality products and responsive customer service, and we apologize if your experience has not met those expectations. Unfortunately, we have been unable to locate any specific claim or correspondence related to the details you’ve provided. We kindly ask that you reach out to our Dartmouth branch directly at ###-###-#### or *********@********.com with your contact information and any additional details pertaining to your prior claim. This will allow us to better assist you and address your concerns promptly. We value your business and look forward to resolving this matter to your satisfaction. Sincerely, Mitten Building ProductsReview from Adrian H
1 star11/21/2024
We have a relatively new house (Built and moved in in last 3 years. We have now had two windows shatter in cold weather on there own. Two windows in 2 years just from weather. Very disappointingly poor quality. It takes about 5-6 weeks for them to fix these windows and it comes with a Hefty price. Please carefully consider alternatives if you are having new windows installed.Cornerstone Building Brands Response
11/22/2024
Mr. ******,
Thank you for sharing your feedback. We sincerely regret to hear about your experience with your windows and understand how frustrating it can be to deal with these issues.
While our warranty does cover certain aspects of product defects, it does not include shipping and handling fees, which are outlined in our warranty terms. If you have not already submitted a warranty claim for your windows, we encourage you to do so via our online warranty submission form so we can assess the situation and assist you further.*****************************************************
Please feel free to contact us directly if you have additional details or need assistance with a claim.
Thank you,
Cornerstone Building BrandsReview from Wade F
1 star11/13/2024
Absolute trash windows, their glass is so poorly constructed, they dont warranty the actual glass against anything including manufacturing defects that result in cracks from temperature changes. When you file a claim they will spend weeks asking for more and more pictures of labels that dont exist, only to then say oh we dont cover cracks to the glassCornerstone Building Brands Response
12/05/2024
Mr. *************** you for sharing your feedback. We regret to hear about your dissatisfaction with our warranty process and the outcome of your claim.
To clarify, cracked or damaged glass is not covered under the terms of our warranty unless it is caused by a verified manufacturing defect. As part of our standard claims process, we request detailed information, including photos and labels, to determine if a manufacturing defect is present. In this instance, your case was reviewed thoroughly and found to fall outside of warranty coverage. We provided you with a copy of the warranty terms for reference to ensure transparency.
We understand your frustration and apologize for any inconvenience. Should you have additional concerns or require further clarification, we would be happy to assist.
Thank you,
Cornerstone Building BrandsReview from JOHN L
1 star10/21/2024
bout siminton windows had them installed bye ************************************. the windows have stuff growing inside the window the other one shows moisture in side have tyed to get warrantied for a year now. no luck with the installer so i went to this company directly. made a warranty claim al most 2 months ago still getting run around. dont use this companies product its all junk and they will not stand behind there warrantyCornerstone Building Brands Response
10/28/2024
Mr. **************** understand your concerns regarding the issues with your windows, and we apologize for the delays in resolving your warranty claim. A new glass insert has been ordered, and a work order has been assigned to our technician team to complete the replacement. The glass is expected to arrive by November 12th, and once our team has confirmed receipt of the parts, they will reach out to schedule your site visit.
Please feel free to contact us if you have any questions in the meantime. We are committed to completing the work as promptly as possible.
Thank you,
Cornerstone Building BrandsReview from Ann G
1 star09/21/2024
I bought a home with 'newer looking' ******** windowd throughout. One tilt latch broke and I applied for replacement online under warranty replacement 3 times. They go back and forth asking for serial numbers and more that were not on my **********************. I did send them a pic of window with the ******** logo engraved in them. I tried getting their attention by emailing, ******** messaging twice and calling (forget that, you will never reach a live person) without any luck. I will make sure to never buy this company's products.Cornerstone Building Brands Response
10/01/2024
A customer service supervisor will be reaching out to discuss what is needed to resolve the issue.
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