GLAZED windows and doors play a pivotal role in home insulation and improving energy efficiency, moreover, the range of styles and colours now available in UPVC and new composite materials can greatly enhance the visual aspect of a home, as do the new must-haves such as bi-fold doors, French doors, and low-profile glazing. But when it comes to replacing, repairing or installing new windows and doors, how do you find a reputable company?