The Johannesburg Heritage Foundation has been grading sites for many years. It is one of the founder organisations of The Heritage Register. The Foundation is well known for its tours across the city as well as its ongoing preservation work. It funds its own research centre which is a priceless asset to the City.
A = Outstanding heritage value. Don't touch our treasures.
B = Fine building. Beautiful and probably a good example of a period or the work of an excellent architect, with historical interest. It may also have landmark value. Touch with very great care, only after consultation and don't even think of demolition.
C = Good building, part of a significant group and probably contributes to street scene, but possibly only a façade. Don't touch without consulting the Johannesburg Heritage Foundation. Changes are possible but demolition will be resisted.