International Window Corporation

Wow! Now my lifetime warranty is gone. Lame.
We had new double hung vinyl windows installed 4 year ago, and in that time, the fin seals are already flattening out. These windows do not seal well at all. When cars drive by, with our windows properly shut, it seems like the window is actually open due to the amount of sound that transmits through these fin seals. I would stay away from the vinyl double hung windows if you are expecting any outside noise reduction.
I’ve called their service department, sent emails with pictures of the problem areas, and the answer I received is, that’s the way they are designed/​built. No fix, sorry.

I have all IWC Bronze Aluminum slider windows and some casement windows. I purchased them maybe 3 years ago so they may/​may not be under warranty.
I just wanted to give a fair perspective to be honest:
(1) I think my windows look great. They were a great value price for what I got. Bronze Aluminum windows from other companies were twice as much and I shopped around. At the time I purchased them I didn’t really care about a lifetime warranty as I wasn’t sure how long I would live in my current home. The bottom line price is what sold me and they looked good enough.
(2) So far my windows in San Francisco have no problems at all and they look great. I get a lot of compliments on them.
(3) Reason I am not giving 5 stars is because I don’t like the idea they won’t honor a lifetime warranty for anything purchased before 2011. I have not looked for my receipt, but they may have been purchased right in 2011 so I’m not sure if they are under warranty. I think the company should honor the warranties if it keeps the same name.
(4) If you purchase the windows from them now, they will be covered under warranty I am told by my reseller. Commercial windows get 10 years and residential lifetime. The problem is what is the point if companies change hands and they don’t honor the warranty.
Would I still buy these windows if I was told they only had a 10 year warranty instead of a lifetime warranty? Yes, I would because the price was so good compared to the other companies. And most companies don’t give a lifetime warranty unless you buy from a high end company their higher end priced windows and then you are paying 3 – 4 times more for the window. They basically build into the window cost that lifetime warranty.

DO NOT buy these windows. I bought new windows for my entire house about 6 years ago. I went with IWC for thier lifetime warranty and the overall price was about $ 1,000 less than Milgard. Well, I guess you get what you pay for. Now almost half my windows are fogged over because the gas is failing. I contacted the company for my lifetime warranty. Because the company claimed bankruptcy a few years back they no longer have to honor their warranties. However, they’re still selling windows under the same name with the exact same products.

I purchased IWC aluminum thermal break windows and cannot say enough bad things about them. First the thermal break material shrinks under direct sunlight at the mitres and creates a huge gap for water penetration… HUGE PROBLEM ! Also the «Low-​E» glass has started to stain and discolor on all the south facing widows which there is no repairing just replacing after 5 years… amazingly cheap glazing. Thirdly, all the fenestration insulation was all poorly installed and cut too short at the corners almost like there was NO quality control at all. I cannot stress enough to stay away from these long term investments and shun any building material sales person who says otherwise. I had posted a review of these windows several months ago and for some reason that review has disapeared. Ohh yeah. The windows WERE. «guaranteed for a lifetime» … not anymore.

This is the location of most Unilocal reviews; all 7 so far are one star and an interesting story not unlike mine
New Co, operating under the same name as Old Co is refusing to honor Old Co’s «Lifetime Warranty» on our windows that are now fogging.
I was told the Old Co went bankrupt and someone purchased the assets of Old Co but not the «Lifetime Warranty» liability. Is this legal or just a ‘slide of hand?’ That is the question.
Through this magic process, allegedly in 2011, New Co is claiming they are not responsible for Lifetime Warranties prior to the date of this transaction. So; our «Lifetime Warranty» issued by Old Co with the same name International Window Corporation: «More than 50 years ago, International Window Corporation began as an aluminum window manufacturer specializing in Jalousie-​style windows. As the market changed and diversified, we strategically adapted to meet those expanded needs. Our services grew to also include vinyl windows and sliding and hinged patio doors.
Through those years of change and invention, we have maintained a focus of quality and superior customer service for you.» Source:
… Sounds like the same company, even the same logo of a stylized IWC that issued our warranty.
There is no mention of this alleged transaction on their website.
This sounds like an issue for 7 On Your Side.
There website at
has the headquarters in Fullerton, CA and not South Gate.
1551 E. Orangethorpe
Fullerton, CA 92 831
800−477−4032 — Toll Free
562−928−6411 — Office
562−928−3492 — Fax
Northern CA Division
30 526 San Antonio St.
Hayward, CA 94 544
800−624−0990 — Toll Free
510−487−1122 — Office
510−471−9387 — Fax
Want to see more Unilocal one star reviews go to:
… Apparently they have moved and Unilocal has not caught up with them yet. b