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 a matter of regulatory and municipal law. It is not linked to the road construction load.

House numbers (and street names) serve as orientation in the city or municipal area and fulfill an order function for all personal or location-related data. Two equivalent systems are used to arrange house numbers:

• the so-called Parisian system with a kind of zipper system (the numbering begins 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 to even and odd to the other end of the street, often occurring due to the different size of the individual plots, that numerically adjacent numbers are not opposite in reality) and
• the so-called Berlin system with circumferential house numbering (the number sequence starts on one side of the street with 1, continues without interruption to the end of the street and then back on the other side of the street).

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

The control of whether a house number has been affixed by the owner of the property/house is the responsibility of the general regulatory authority. The local house number signage will be checked in case of complaints. The property owner is then asked to provide a house number visible from the traffic area.