Professional Cat flap installers can put your pet's entrance in either a door or a wall. The wall-mounted version is more secure, as an intruder cannot reach through. It also prevents draughts and reduces the energy costs. The Tasker will mark the position of the cat flap inside your door https://www.repairmywindowsanddoors.co.uk/aldershot-cat-flap-installer-near-me/