A (Primary) – The site represents the best example of a style or type of building. It may be associated with a person or event of significance, or an early pattern of development.
B (Significant) – The site represents a good example of a particular style or type, either individually or collectively. It may have some documented historical or cultural significance in a neighbourhood.
C (Contextual or character) – The site represents a building that contributes to the historic character of an area or streetscape, usually found in groupings of more than one building, but may also be of individual importance.