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Professionals should handle the installation of a cat flap onto your door panel. The doors are typically made of a flimsy plastic exterior joined to a soft, insulation polystyrene core. These materials can be difficult to cut. It's a lot easier to put the cat flap inside the glass pane that is already in place, or have a new door manufactured with the hole already prepared. A Glazier can do this for you. Easy to install Upvc door panels can be a great option if you have a cat at home and would like to let it in