https://perfectworld.wiki/wiki..../Fitting_a_Cat_Flap_
You could consider installing a cat flap onto an upvc panel door for those who want to let your pet go inside and out of the house without fearing that they'll leave unwelcome "gifts". This option is less expensive than replacing the entire door and is simpler to install. It is possible to set up an animal flap on your own uPVC doors however, it's an arduous task that could lead to costly errors. Easy to install It's important that you can allow your pet or cat into and out of the house. This will not only keep them safe,