How to Choose the Best Double Glazing Companies Near Me If you're looking for double glazing, ensure that you keep an eye out for important accreditations. These include FENSA, a government-authorised scheme that monitors building regulation compliance for replacement windows. The top double-glazing companies are Everest, Anglian Home Improvements (AHI), http://www.stes.tyc.edu.tw/xoops/modules/profile/userinfo.php?uid=1202369