The fort consisted of a rectangular enclosure measuring approximately , and covering an area of almost . and was enclosed by a thick wall of roughly coursed stone. A clay ramp backed the wall from the inside, and a ditch ran around the outside. Access to the fort was given by four gates, one on each side. Three of these gates were narrow single-width entry points, while the east gate was double-width and flanked by guard posts. A road extended from this across Borrans Park. The principal buildings were laid out in a row across the centre of the fort's interior. The barracks were at least partially built from wood.
Building I consisted of a pair of granaries, separated by a wide space that once contained ovens. The presence of the ovens and remains of cereal indicate that this area was probably used for drying grain. It is unknown whether this area was roofed. The granaries themselves each measured long (east-west) and were of a standard Roman plan, with external buttressing and with windows for ventilation. The granaries were rebuilt on at least one occasion.
Building II was the
Principia or
Praetorium, and was very similar to the example at
Hardknott, some to the west. It measured . The building was entered from the east, and had two courtyards, and three offices that faced onto the inner of these. The central office was the
sacellum, and was used to store the altars and standards of the garrison. It contained a square cellar accessed by a stone stairway; this probably was used as a strong-room for regimental funds. It was likely to have been vaulted with wood, rather than stone as at other sites. In the northern office, remains of a grain bin were excavated, identified from woodwork and cereal remains. The inner courtyard contained a detached building on the north side, and the whole courtyard may have been roofed. The remains of a hearth or oven were found within the colonnade around the outer courtyard.
Building III was the commander's house. The building had two storeys, and measured . It conformed to a standard plan of rooms arranged around a cloister that enclosed a small courtyard. ==Associated finds==