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It is recommended to hire an expert to install a cat-flap in your home. DIY projects often result in poorly fitted pet flaps that could let in drafts or increase the cost of energy. SheffLOCK is able to put a cat flap on most types of doors, including wood, glass, uPVC composites and even external walls. It takes about 2 hours to install the cat flap. Pet flaps cost money A pet flap lets your cat