Professional Cat flap installers will install your pet's door into either a door, or a wall. The wall-mounted version is more secure because an intruder won't be able to get through. It also helps prevent draughts and reduces the energy costs. The Tasker will mark where the cat flap is https://www.repairmywindowsanddoors.co.uk/aylesbury-cat-flap-installer-near-me/