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It is best to hire an professional to install a cat-flap inside your home. DIY projects typically result in poorly fitted pet flaps that could allow in draughts or raise the cost of energy. SheffLOCK can install a cat flap on most types of doors, including wood, glass, uPVC composite and even on external walls. It takes approximately 2 hours on average to install a new cat flap. Pet flaps cost money A pet flap is a great option to let