| Definition of the Gradings | |
|---|---|
| Grade 1 | Buildings of outstanding merit, which every effort should be made to preserve if possible. |
| Grade 2 | Buildings of special merit; efforts should be made to selectively preserve. |
| Grade 3 | Buildings of some merit; preservation in some form would be desirable and alternative means should be considered if preservation is not practicable. |
* The definitions of gradings are administrative guidelines adopted by the Antiquities Advisory Board and the Antiquities and Monuments Office for the preservation of historic buildings.