https://www.openlearning.com/u..../stevenshjelm-smd1ue
https://squareblogs.net/chivec....ard73/cat-flap-insta
You could consider installing a cat flap onto a upvc panel door in order to let your pet leave and enter the house without fearing that they will leave unwanted "gifts". This is less expensive than replacing the entire door and is simpler to install. While it is possible to fit an animal flap inside your own uPVC door, you need to understand that this is a difficult job that could lead to expensive mistakes. Easy to install If you have