https://postheaven.net/ballpro....fit12/fitting-a-cat-
Installing a cat-flap to your door is an easy process. However, you'll have to be aware of a few things before getting started. It is possible to install Upvc panels that have a cat door without having to cut a hole into your wall or door. They are available from a variety of glass companies with a premade hole to fit the door for your pet. 1. Safety upvc door panels cat flaps are easy to install and can be fitted to many different kinds of doors. They are weatherproof and energy efficient, and have draft-proofing built in to help