https://informatic.wiki/wiki/C....at_Flap_Installation
If you're looking for a method to let your pet in and out without having to worry about them leaving unwelcome "gifts" within the home look into a upvc door panel with cat flaps. This option is cheaper than replacing the entire door and is simpler to install. It is possible to put a cat flap on your own uPVC doors however, it's a tricky task that could lead to costly mistakes. Easy to install It's important that you can allow your pet or cat into and out of the home. This will keep them safe and als