When there are no street numbers available to allocate to a new building, then letters should be used as suffixes to street numbers (A - E only).


The order of letters should be in the same direction as the numbering of addresses on the street. Note: This may mean that ‘A’ is not at the front.

Hobson Street addressing image 1

Letters should be used for all homes that use the original street number, as in the example above. One exception is when a property has been subdivided. In this case, then the existing home can just use the number as long as it remains in sequence with the rest of the street, as shown in the image below.

Hobson Street addressing image 2

When using the street number would mean the street numbering would not be in order, a letter suffix should be applied to the street number. In the example below, the house that was previously 25 would need to be numbered 25B and the new home would be numbered 25A to maintain numbering.

Hobson Street addressing image 3

Sub-address numbering

Sub-address numbering is used for address sites like apartments or flats that are within a primary address. The street number of the address should not be used on its own (image one, below) once a building is divided into units/flats (image two). Instead, all the dwellings on the site must be sub-numbered as 1/, 2/ etc. This is shown in the second image below.

Sub addressing smith street 1

(Click to view larger image)

Sub-address numbering can also be used to keep street numbers in sequence when an already subdivided address (image one, below) becomes subdivided again (image two). In the example below, 21A will now be out of sequence so it must be renumbered as 1/21A. The new dwelling will be numbered 2/21A to maintain numbering along the road.

Sub-address numbering - subdivisions

(Click to view larger image)

Last Updated: 4 December 2015