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If you want to install a pet flap on your uPVC door or glass panel, you're going to need the help of an experienced cat flap fitter. can also help with more sophisticated models, such as microchip pet flaps. DIY attempts to install a pet flap can often cause problems like draughts or low energy efficiency. Professional tradespeople can save you from the stress and cost of dealing with these problems. Cost The cost of installing a cat flap could be affected