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If you are planning to install a cat flap in your home, it's best to hire a professional tradesperson. DIY projects usually result in poorly fitted pet flaps which allow drafts and result in higher energy bills. SheffLOCK can install a cat flap on all kinds of doors, including wood, glass, uPVC composite and even exterior walls. It takes about two hours to put up a new cat flap. Pet flaps cost money A pet flap permits your cat to come and go whe