- Numbering should be based on the layout and physical characteristics of the site.
- Small cul-de-sacs of up to 12 properties with no potential for future extensions onto adjacent land: These should be numbered consecutively clockwise. This is particularly useful where properties are only being constructed on one side of the new street and more properties may be added on the other side of the cul-de-sac at a later date. This should be avoided where there is a possibility of the cul-de-sac being extended in length in the future.
- Larger cul-de-sacs with no potential for future extensions onto adjacent land: These should be numbered with odds on the left and evens on the right. Always ensure that odd and evens meet at the start of the cul-de-sac irrelevant of whether the odd/even numbering might not meet perfectly around the cul-de-sac.
- Cul-de sacs with potential of future extension with infill, a turning head, spur or vacant land or large garden to a property or demolition of a building that could be used to extend the street number sequence of odds on the left and evens on the right with a change between the odds and even at the potential future extension point should be considered by leaving a number spare.
- Allocate a suffix of Close to indicate no through road or a potential alternative of End if it is highly unlikely that potential future extensions will change the street from a cul-de-sac to through road. The original cul-de-sac will have been approved and constructed to a highway specification for a cul-de-sac and not a through road. Therefore, even if extended the suffix of Close or End will still be appropriate.
- As with all developments consider the potential to squeeze another future property onto a plot that has an appropriate sized garden area to do so and not using appropriate numbers.