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 reduces energy costs and prevents draughts. The Tasker will mark out the position of the cat flap inside your door https://www.repairmywindowsanddoors.co.uk/waltham-forest-cat-flap-installer-near-me/