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It is best to employ an professional to install a cat-flap inside your home. DIY projects usually result in poorly-fitted pet flaps that could allow in draughts or raise energy bills. SheffLOCK is able to install cat flaps on all kinds of doors, such as wood, glass, uPVC composite and even on external walls. On average, it takes about 2 hours to install the cat flap. Pet flaps cost money A pet flap permits your cat to move around whenever it wishes. If the flap isn't in