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It is recommended to hire an expert to install a cat-flap inside your home. DIY projects typically result in poorly fitted pet flaps which allow drafts and result in higher energy bills. SheffLOCK can be installed as the cat flap into all kinds of doors like wood, uPVC, composite and glass doors and even external walls. It takes around two hours to install the new cat flap. Cost of the pet flap A pet flap is a great way to let your cat move around whenever it wants. However, if the flap isn't properly fitted, it could let