Simple mistakes 2. Lack of house number or visible number People can find your house quickly if you have a house number. This also affects the police, ambulance, and fire department in the event of an emergency. Please make sure the number is visible from the street. For more information, please see How to display your house number If you have no visible number, the driver must search up and down the street and do some of it on foot. It can waste up to ten minutes of valuable time. It usually causes the driver to knock on the wrong door. The driver might have to call you on the phone or return your pizza to the store. Without a house number, we might deliver to the wrong house by mistake. Your neighbor might claim the pizza and steal it from you. Last updated: February 17, 2003