After Edward decided to build the castle people started building it quickly. Sir John Bonvillars was the foreman for the building of the castle. A mason named James of St. George also worked on the project. They started building it in 1283. From 1283 until 1284 they built the walls and towers. Next, they built the buildings inside the castle walls. They also built walls for a town nearby. That took place between 1284 and 1286. They finished building the castle in 1287. People came from all over England to help build the castle. People would meet in Chester and walk to Wales to work at the castle. In total the project cost £15,000. That was a lot of money back then.