Reviews
This profile includes reviews for Cornerstone Building Brands's headquarters and its corporate-owned locations. To view all corporate locations, see
Customer Review Ratings
Average of 105 Customer Reviews
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Review fromVenkateswaran K
Date: 11/11/2025
1 starMy home windows are under warranty and I have been following up on one of the window that is to be replaced and I am following for last year and a half for just one glass oval window and they say it either shipped but after that they say they had to talk to the engineering team and now I am Repeatedly sending emails at least every three days and even after like 1520 emails nobody is there to even respond what is happening and I would never refer anybody to go with this companyReview fromJose D
Date: 11/03/2025
1 starHome was built in 2021 with Ply Gem windows. Desert southwest not much rain. Recent monsoon revealed damaged seal in small window in MBR. Condensation has formed and I have photographed multiple angles and every sticker on window. Forwarded to Cornerstone. Was told usual reply time "Please note that processing warranty claims can take 46 weeks from the date of submission. Once the processing of your claim is complete, you will receive an email notification with the next steps or resolution details." After multiple emails, I received a reference number with more requests for photos. Replied and sent. This all began early August of 2025. It's now early November with no further responses.This "support" and *************** is apalling!
Cornerstone Building Brands
Date: 12/03/2025
Mr.****,
Thank you for bringing this issue to our attention. We sincerely apologize for the lack of communication you experienced.
We want to inform you that your warranty request has been successfully processed. We have identified the window that requires the glass replacement and will be sending you the replacement glass for the window that experienced the seal failure.
You will receive the order details today, which will include all the necessary information.
Thank you.
Cornerstone Building BrandsReview fromR. N.
Date: 10/15/2025
2 starsTwo stars because the submission process was easy. But after that it would be zero stars. Submitted 9/16/2025 and received email that day that they are working on it. Ive gotten zero update even to subsequent email I sent last week asking what is normal response time. Disappointing.Cornerstone Building Brands
Date: 11/04/2025
Mr.******,
We sincerely apologize for the delay in processing your claim. Please note that the current lead time for processing claims is approximately 6 to 8 weeks. ************************ with ******, our customer support representative, she has confirmed that she has been in contact with you today to resolve the case.
If you have any additional questions or concerns, please feel free to reach out to us directly.
Thank you.
Cornerstone Building BrandsR. N.
Date: 11/12/2025
I did have positive conversation with your associate, ****** and now understand the normal timing. I was unable to find way to adjust my star rating, which i would increase based on the phone call. I appreciate the reply and working with me on this claim. ***Review fromDee S
Date: 10/15/2025
1 starI was sent payment for an invoice to cover shipping costs for 6 Replacement glass panes on 10/9/25. Received an email on 10/10/25 reminding me to make payment. Emailed collections as well as their company representative on 10/11/25 asking if they received my payment. No response. Have tried calling since Monday, 10/13/25, no one will pick up the phone or return a call. Company directory doesnt even list my representative. So aggravating. I dont want to make another payment and risk being charged twice. What is up with this company? Can anyone help??Cornerstone Building Brands
Date: 11/03/2025
Ms.*****,
Thank you for your message. After discussing with *****, our customer support representative, she confirmed that the case has been closed at your *********** mentioned that you will reach out to us if any future issues or questions come up.
I also want to confirm that the payment was not processed, and no charges have been applied to your card. Since you did not receive a confirmation code, it seems the final step of the payment process may not have been completed. Please let us know if you need any further assistance.
Thank you,
Cornerstone Building BrandsReview fromZufar S
Date: 10/10/2025
1 starI have stones installed on the facade of my townhouse. Cornerstone of **********, ** installed them. Two stones have already fallen, one of which damaged my car. Luckily, no one was hurt.Cornerstone Building Brands
Date: 10/28/2025
Zufar,
We sincerely regret to hear about the concerns regarding your stone. We kindly ask that you contact the **********, ************ location at ************ if you have any questions about whether your products are covered under warranty. They will be happy to assist you in confirming if your specific products qualify for warranty coverage.
If you have any additional questions or concerns, please feel free to reach out to us directly.
Thank you,
Cornerstone Building BrandsReview fromTerry W
Date: 09/30/2025
1 starI have plygem windows from cornerstone building. 4 windows need replacing under warranty. Cant get anybody yo help me. I have called two times a day for a week and nobody will do anything. Im being told it will be 6 weeks before i will be contacted for my warrantyCornerstone Building Brands
Date: 10/13/2025
Mr.*****,
Thank you for your patience and for sharing your feedback. We value your business and want to inform you that we received your payment for the shipping charge on Friday, October 10, 2025. We will be placing the order and shipping the parts this week.
If you have any questions or need assistance, please feel free to contact us.
Thank you.
Cornerstone Building BrandsReview fromjohn s
Date: 09/23/2025
1 starQuality has been hit and miss. One set of sliding doors is fine. The other set, same model, has been one failure after another. Getting customer support takes lots of time and perseverance. They are not great at answering the phone or following up. I now have a handle on the side that controls the locking mechanism. The base plate has cracked and bent after 7 years of use. Trying to get a replacement. As of yet have not even been successful at contacting customer support. Same experience as the last time. *****.Cornerstone Building Brands
Date: 10/10/2025
Mr.****,
Thank you for your feedback. To assist you further, we kindly request additional information regarding your claim. If you have not yet filed a claim, please do so, or contact our customer support center at ************ with the relevant details.
Please feel free to reach out to us directly if you have any additional information or need assistance with your claim.
We appreciate your patience and are committed to resolving this matter promptly.
Thank you.
Cornerstone Building BrandsReview fromBeverly G
Date: 09/08/2025
1 starOur experience with EAS Architectural Systems is stretching it to be 1 star. We have their hurricane windows & a large picture window and have had nothing but problems with defective ****************************** staff. Our most recent issues started a few months ago. They sent out "their *** ****" to inspect the windows in question and eventually sent him back out with installers to replace the numerous window defects, including replacing our picture window, but didn't complete the job that day leaving us with several defective windows. They eventually sent out 2 men to install a new picture window, at first telling us they needed to send someone who was licensed and bonded, which turned out to be false. They worked on the picture window for 4 hours using a **** ****** and other tools of destruction and it is still an incomplete job, plus the new glass that is installed is wavy so once again we have received a defective picture window from EAS. When I inquired about them replacing the interior window trim that was destroyed when they were working on the picture window I was told *** doesn't do that. What?? In addition, *** still has not replaced the remaining defective windows and they are avoiding phone ***************Cornerstone Building Brands
Date: 10/10/2025
Ms.*******,
We sincerely apologize for the issues youve experienced with your windows. To assist you further, we kindly ask that you reach out to our customer support center at ************ or ***************************************************************** with any details pertaining to your claim. If you have a reference number for the original case or any relevant information from the installation, such as date, or who performed the work, 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.
Thank you.
Cornerstone Building BrandsReview fromMaurice B
Date: 09/02/2025
1 starI purchased triple pane windows to improve energy efficiency and considered the federal tax credit when making my purchase. After the installation I requested the qualified manufacture code which is a new requirement to claim the credit beginning with tax year 2025. They said that the *** chooses who is a qualified manufacture, which is a false statement. They need to simply register and will be issued a code. Despite providing them this information, it appears they have no interest in completing the process that would allow their customers to claim the credit, which would apply to nearly all of their products.Review fromMolly K
Date: 08/06/2025
1 starI had Mitten siding installed on my house, and unfortunately encountered a serious issue: the siding warped due to direct glare from my neighbors windows reflecting sunlight, creating localized hotspots. When I reached out to Mitten, they stated their siding cannot tolerate sustained temperatures above 160F, and that such conditions were excluded from warranty coverage.Thats surprisingly low. While exact thresholds arent always disclosed publicly, vinyl siding typically expands and warps under intense heat or reflected sunlightand it's common industry guidance to avoid such exposure to prevent distortionbut it's unusual for a manufacturer to draw a line at just 160F, which seems lower than what most durable siding products claim to withstand reliably ******************** ********************* +10 ************************* +10 ************* +10 .When I contacted my contractor about mitigation options, he generously offered to buy new siding himself, because Mitten refused to cover it. Then I asked Mitten if they'd at least assist with the cost of installing glare-reducing screens or applying film to the neighbors windowsbut they just pointed me back to the warranty policy and declined any help or reimbursement for these solutions.Its deeply disappointing. Siding is meant to be a long-term investment that stands up to the elements and occasional indirect heat sourcesit shouldnt fail under circumstances that fall reasonably outside normal use. Mittens unwillingness to support or help find a practical fix felt dismissive, and their rigid threshold policy seems inadequate compared to industry norms.Cornerstone Building Brands
Date: 09/24/2025
Ms. ******************** you for taking the time to share your feedback. We sincerely apologize for the frustration you've experienced with your siding.
At Cornerstone Building Brands, we strive to provide durable products backed by comprehensive warranties. While we understand your concerns about the warped siding, the temperature threshold referenced in our warranty is based on extensive testing and industry standards to ensure product performance and longevity.
Please feel free to reach out directly to our customer service team if you'd like to discuss your case further. Your satisfaction is very important to us, and we value your feedback as it helps us improve our products and services.
Thank you again for sharing your experience.
Sincerely,
Cornerstone Building Brands
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