Yes, uPVC doors can in fact be recycled up to 10 times. This makes uPVC doors environmentally friendly.

The process of recycling UPVC is well established, and contributes a substantial amount of material to new products.

When they are removed from a building, nany metal and glass is removed from the doors and windows, and then the remaining UPVC is shredded into tiny pellets of plastic which can then be treated before being mixed into fresh uPVC material that is used in the manufacture of future doors and windows.  

Because UPVC can be recycled in this way, it makes the whole process of manufacturing products much more energy efficient and sustainable, reducing the impact on the environment.