How to Choose the Best Double Glazing Companies Near Me If you're shopping for double glazing, ensure that you keep an eye 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, Safestyle UK http://www.stes.tyc.edu.tw/xoops/modules/profile/userinfo.php?uid=1198939