https://telegra.ph/Cat-Flap-In....stallation-in-Glass-
https://postheaven.net/hillbut....ton6/how-much-does-a
https://articlescad.com/instal....ling-a-upvc-door-pan
If you're looking for a way to let your pet in and out without having to worry about them leaving unwanted "gifts" in the house, then consider getting a upvc door panel with cat flap fitted. This option is cheaper than replacing the whole door and easier to install. It is possible to put a cat flap on your own uPVC doors but it's a tricky task that could lead to costly