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It is best to hire an expert to install a cat-flap inside your home. DIY projects usually result in poorly-fitted pet flaps that allow in drafts and result in higher energy bills. SheffLOCK can install a cat flap on most types of doors, including wood, glass, uPVC composite and even exterior walls. It takes around 2 hours to put up a new cat flap. Cost of the pet flap A pet flap is a great way to let your cat leave and come whenever it wants. If the flap isn't correctly installed, it could allow heat escape f