House numbers are assigned by the general regulatory authority on the basis of building applications, notifications of construction measures or at the request of the owners. The allocation of house numbers is not a matter of road law, but of regulatory and municipal law. It is not linked to road construction responsibility.

House numbers (and street names) are used for orientation in the urban or municipal area and fulfill an organizational function for all personal or location-related data. Two equivalent systems are used for the arrangement of house numbers:

• the so-called Paris system with a kind of zipper system (the numbering starts at the end of the street facing the city center on the left side with 1 and on the right side with 2 and then runs separately according to even and odd to the other end of the street, whereby it often happens due to the different size of the individual properties that numerically adjacent numbers are not opposite each other in reality) and
• the so-called Berlin system with house numbering all the way around (the numbering sequence starts with 1 on one side of the street, continues without interruption to the end of the street and then runs back on the other side of the street).

In order to integrate new buildings into an existing house number sequence, it may be necessary to change existing house numbers.

The general regulatory authority is responsible for checking whether a house number has been affixed by the owner of the property/house. The local house number signage will be checked in the event of complaints. The property owner will then be asked to ensure that the house number is visible from the traffic area.