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If you want to install a cat flap inside your home, it is recommended to hire an expert tradesperson. DIY projects usually result in poorly fitted pet flaps which allow drafts and cause more energy costs. SheffLOCK is able to put a cat flap on most types of doors, including wood, uPVC composite, glass and even exterior walls. On average, it takes about 2 hours to install a cat flap. Cost of the pet flap A pet flap allows your cat to move around whenever i