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You'll need an installer for your cat flap in order to install an animal door on your uPVC or glass panel. They can also help with more sophisticated models, like microchip pet flaps. DIY attempts to install a pet flap often result in problems like draughts or low energy efficiency. A professional tradesperson can save you the headache and expense of dealing with these problems. Cost The cost of installing a cat flap could be affected by a variety of factors