https://blogfreely.net/paperle....o14/using-a-cat-flap
Are you tired of having to climb up to open the door to your pet. If you are, then a cat flap could be the solution. Pet-flap installers can put them in any kind of door, regardless of whether it is uPVC or composite. They can also be fitted into certain types of walls. Security Cat flaps are often fitted to doors, but many also have them installed on windows or double-glazed doors. If you don't have a wood wall or door installing one into glass is an excellent option. It's also a great solution for people who rent. You