https://pediascape.science/wik....i/Replacement_UPVC_D
https://perfectworld.wiki/wiki..../How_to_Install_a_UP
You could consider installing a cat flap onto a upvc panel door for those who want to let your pet enter and exit the home without worrying that they will leave unwanted "gifts". This is less expensive than replacing the entire door and easier to put in. While it is possible to fit an animal flap inside your own uPVC door, it's important to be aware that this is a difficult job that could result in expensive mistakes. Easy to install