| Grade I |
Buildings of outstanding merit, which every effort should be made to preserve if possible. |
| Grade II |
Buildings of special merit; efforts should be made to selectively preserve.
|
| Grade III |
Buildings of some merit, but not yet qualified for consideration as possible monuments. These are to be recorded and used as a pool for future selection.
|
| * The definitions of gradings are internal guidelines adopted by the Antiquities Advisory Board and the Antiquities and Monuments Office for the preservation of historic buildings. |