Although Selborne bricks were originally made by hand, the process was automated at a later stage for reasons of efficiency. The clay, required for producing the bricks, was dug from a pit located just beyond the brickworks and stored in a blister hanger. This ensured that production could continue even in case of bad weather when the excavator was unable to work. 

When the clay entered the  plant it was crushed and mixed with water and other additives, which may have included breeze, a very fine anthracite that aids firing. This process, also known as pugmilling, improves the consistency, firing qualities, texture, and colour of the brick. From here, the processed clay was either extruded into a continuous strip and cut with wires, or put into moulds or presses  to form the clay into its final shape. After the forming or cutting, the bricks were dried in drying kilns before being fired in a kiln, to give them their final hardness and appearance. The kilns and the wire cutters can still be seen at the Selborne Brickworks.