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It is recommended to hire an professional to install a cat-flap inside your home. DIY projects typically result in poorly fitted pet flaps that let in drafts or increase energy costs. SheffLOCK can fit a cat flap in most types of doors including wood, uPVC, composite and glass doors as well as exterior walls. It takes approximately two hours to put up a new cat flap. Cost of the pet flap A pet flap permits your cat to move around whenever it wishes. If the flap isn't properly installed, it will let heat escap