New uPVC windows are always an excellent investment to boost your home’s market value. But do all windows add the same value? At first glance, the structure of any window seems quite simple: a frame, a sash, glass, and hardware. Besides, when new, all windows are aesthetically appealing and promise to be highly energy-efficient. Unfortunately, it is only during operation that we start to notice the flaws such as improper thermal insulation, difficulty of operation, breaking hardware, etc. And it is needless to say how costly many of these faults could be.