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It is best to employ an expert to install a cat flap inside your home. DIY jobs usually result in poorly-fitted pet flaps, which can let in drafts and result in higher energy bills. SheffLOCK can install a cat flap on most kinds of doors, such as wood, glass, uPVC composite and even on external walls. It takes about two hours to install a cat flap. Cost of the pet flap A pet flap is a great method to allow your cat to come and go whenever it wants. If the flap is not installed correctly