https://www.openlearning.com/u/ryanhelms-sm0960/blog/CatFlapsForFrenchDoors Your cat and you can both benefit from adding an animal flap into your bifold door. It can also stop extreme cold or heat from entering your home. The first step is to take measurements of your pet to determine the right size door flap is needed. This will help you create a hole that is adequate for the flap. Outdoor Access Installing a cat flap inside the back of your house is not a job for a novice, even those with a little DIY skills can usually do it. This will help you avoid the cost and headache of hiring a carpenter or handyman to complete the task for you. You can give your cat full access to the garden or patio by putting the cat flap on your bifold door. This lets you avoid closing and opening the door. This can reduce behaviour issues like litter box avoidance and destructiveness as well as boredom which can occur when pets are confined to the house for extended periods of time. Access to the outdoors through the flap enables cats to engage in normal behaviors like hunting and socializing with other animals, which can improve their physical and emotional well-being. Cat flaps can be put on all kinds of doors, but the most popular choice is an electronic flap that opens only when it detects a microchip on your pet's collar. This will prevent the rogue cats and animals from entering your home. The cat flaps can be fitted into uPVC or GRP doors. If you own modern, energy efficient composite doors then they are built to be more weatherproof and secure than uPVC doors so modifying them to accommodate a cat flap is slightly more challenging than with the traditional uPVC back door. Always go through the instructions included with your cat flap before attempting any installation. This will advise you of the exact dimensions required for your door, and also provide a checklist of all tools that you will need to complete the task. You will also need a tape measure, pencil as well as a spir