https://stairways.wiki/wiki/Ad....ding_a_Cat_Flap_to_Y
The addition of a cat flap to your door panel is an essential task to be handled by an expert. These doors are usually made from a thin, plastic exterior that is attached to an insulate, soft polystyrene core. These materials can be hard to cut. It is a lot easier to put the cat flap into an existing glass pane, or to have the hole drilled in a door. A glass glazier can help you. Easy to Fit Upvc door panels are an excellent option if you have a pet cat and want to allow it to enter and out of your home without leaving.