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It is best to hire an professional to install a cat-flap at your home. DIY projects typically result in a poorly-fitted pet flap that allow in drafts and result in more energy costs. SheffLOCK is able to put a cat flap on most kinds of doors, such as wood, glass, uPVC composite and even exterior walls. On average, it takes around 2 hours to install the cat flap. Cost of the pet flap A pet flap lets your cat to go and come whenever it pleases. However, if the flap isn't correctly installed, it may allow heat escape from your