The castle is rectangular. It has two different sections, the Inner Ward and the Outer Ward. It has four towers. They are and there is one on each side of the castle. The castle would have been painted white with lime render during its early days. The towers have holes in them, called "putlog holes". These holes were used to help the builders build the towers, by putting wood timber pieces through the holes so they could climb up the towers. There are also square holes that are found in the castle walls. No one knows what they were used for. Maybe they were used to get rid of water when it rained, used for hoardings, or for displaying decorations.