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If you want to install a cat flap inside your home, it is best to work with a professional tradesperson. DIY projects usually result in poorly-fitted pet flaps which allow drafts and cause higher energy bills. SheffLOCK is able to install a cat flap on most kinds of doors, including 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. However, if the