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Adding a cat flap to your door's panel is a crucial task that should be completed by an expert. The doors are typically made of the plastic exterior, which is thin and flimsy, and then that is bonded to a soft insulation polystyrene core. These materials can be hard to cut. It's much simpler to install the cat flap inside the glass pane that is already in place or have a brand new door constructed with the hole already made. A glazier can do this for you. Easy to install Upvc door panels can be an ideal option