Both the North and South Entrances, as well as the south west and south east casemates, are Grade II* Listed. The railings at the approach to the north entrance form part of the original construction at The Verne, and are Grade II Listed. The prison's reception centre is also Grade II Listed. In September 1978, five features of the citadel became Grade II Listed, including the prison's blacksmith's shop, the prison chapel, the officer's block B, the prison gymnasium, and the detached Governor's house.