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If you're looking to install a pet flap in your uPVC door or glass panel, then you'll require the help of an experienced cat flap fitting expert. They can also help with more advanced models like microchip pet flaps. DIY efforts to put in a pet flap can fail and can result in issues like the possibility of draughts or low energy efficiency. A professional tradesperson can spare you the hassle and expense of tackling these problems. Cost There are many factors that can influence the cost of installing a cat flap.