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It is recommended to hire an expert to install a cat flap inside your home. DIY projects usually result in poorly-fitted pet flaps that allow in draughts or raise energy bills. SheffLOCK can install cat flaps on all kinds of doors, including wood, glass, uPVC composite and even external walls. It takes about 2 hours to install a cat flap. Cost of the pet flap A pet flap permits your cat to come and go whenever it wishes. If the flap is not fitted correctly, it can let heat escap