The resulting castle centred on a stone tower-keep, measuring 60 feet by 24 feet (18 m by 7 m) internally and 54 feet (16 m) tall, with four round corner-towers. The tower-keep had eight-foot (2.4 m) thick walls made from Lias Oolite ashlar stone and was designed around three floors. The corner towers had conical roofs and prominent machicolations. The ground floor of the tower-house included the kitchen and other service areas. The functions of the first and second floors are uncertain; one theory is that the first floor was another service area, with the hall on the second floor; another approach argues that the first floor formed the hall, and the second floor living accommodation; a minority view proposes that the first floor was an armoury. The third floor was used as living accommodation for the owning family. The original design had a number of windows and fireplaces on the upper floors, but the hall would have been relatively dark and the stairs were inconveniently narrow.