Numbering of streets
A new street is usually numbered with even numbers on one side (normally the right approaching from the town centre) and odd numbers on the other, except for a cul-de-sac where numbering is usually consecutive in a clockwise direction.
Private garages and similar buildings use only for housing cars etc. are not usually numbered.
All numbers, including 13 must be used in the proper sequence. Applications to omit any number from a numbering sequence for whatever reason will be refused.
A named building may not carry more than one street number.
For small blocks of flats it is usual to give a street number to each dwelling but when there are insufficient street numbers available because of existing development, the block will be numbered in the street (and possibly named as well).
Developers are advised that the flats should be numbered in a clockwise direction and not given letters.
This is because often one large old house is demolished and replaced by (say) four similar houses. To include all the new houses in the numbering sequence would involve renumbering all the higher numbered houses on that side of the road - to avoid this disruption each new house would therefore be numbered with the number of the old house with A, B, C, D etc. added.