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Cat flaps let your pet go in and out as they please without you needing to open a gate or window. They are available in a variety of materials and can be installed in doors, windows and walls. A skilled tradesman can put in a cat flap in any door, including wood, composite, and uPVC. Installation Costs The cost of installing a cat flap varies greatly depending on the type, size and complexity of the project. The door or wall material can also impact the labor cost. Installation into the frame of a French glass door, for instance, will cost more than