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It is best to hire an expert to install a cat-flap in your home. DIY jobs usually result in a poorly-fitted pet flap which allow drafts and result in more energy costs. is able to put cat flaps on all kinds of doors, including wood, uPVC composite, glass and even exterior walls. It takes about 2 hours on average to put up a new cat flap. The cost of the pet flap A pet flap permits your cat to go and come whenever it pleases. If the flap isn't installed correctly, it could allow heat to escape from you