https://articlescad.com/cat-fl....ap-installation-into
Professionals should handle the installation of a cat flap onto your door panel. These doors typically consist of a flimsy plastic exterior bonded to a soft, insulate polystyrene. It can be difficult to cut through these materials. It's a lot easier to put a cat flap in an existing pane of glass or have a new door made with the hole already made. A Glazier can do this for you. Easy to Fit If you have a cat and you want to allow them to enter and exit without leaving your home doors made of upvc are an ideal solution.