How to Choose the Best Double Glazing Companies Near Me Keep an eye out for accreditations if in the market for a double-glazed window. 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, Safestyle UK and http://www.stes.tyc.edu.tw/xoops/modules/profile/userinfo.php?uid=1194178