Each full panel takes about half a kilo of clay to complete.
I use the tile impress from Malcolms Miniatures to impress the clay.
I have seen that some makers of Tudor houses use plaster, because it is cheaper, but the tiles are far too big that way.
Looking at photos of real houses the tiles are very small and irregular, due to roofs sagging etc, so I like this way for realism.
Once the wash is applied it looks very real, like Karens shed.