https://wizdomz.wiki/wiki/Fitt....ing_a_Cat_Flap_in_a_
Consider installing a cat flap on the door made of upvc in order to let your pet leave and enter the house without fearing that they will leave unwanted "gifts". This is cheaper than replacing the whole door and is simpler to install. It is possible to set up a cat flap on your own uPVC doors but it's a tricky task that can lead to costly mistakes. Easy to install It is essential to let your cat or dog into and out of the home. This will help you ensure their safety, but also allow you to keep out unwanted draughts or moisture