mxplut

Hello, I am looking for uPVC windows and I know that I could make a list of suppliers as long as my arm from just my local area. Apart from comparing thermal performance, what else should I be looking at to differentiate the higher quality windows from the lower ones. When I visit the showrooms I am sure that every one of them will tell me that their windows are really secure, really well made, really high quality etc. All very woolly terms and not very objective. So when I go poking and testing the showroom models, what do I look for? thank you for your advice and opinions Ben