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It is best to hire an professional to install a cat-flap in your home. DIY projects typically result in a poorly-fitted pet flap that allow in draughts and lead to higher energy bills. SheffLOCK can fit a cat flap on all kinds of doors like wood composite, uPVC and glass doors, as well as external walls. On average, it takes about two hours to install the cat flap. Pet flaps cost money A pet flap allows your cat to go and come whenever it wants. If the flap is not properly installed, it will allow heat to escape from your h