https://imoodle.win/wiki/How_M....uch_to_Install_a_Cat
Are you fed up with having to climb up and down to open your door for your pets? If you are, then a cat flap could be the solution. Pet-flap fitters can install them into any kind of door that is available, including uPVC or composite doors. They can also be installed in certain types of walls. Security Cat flaps are typically used to cover doors, however many install them in windows or double-glazed doors. A glass-based cat flap can be a good option when you don't want cut through a wooden or wall door, and it's also an ideal opt