The building was subject to assessment in 2000 (IC 2) and a programme of historic building recording was undertaken in 2007, prior to conversion.<1><2>

The Canteen and Sergeants' Mess of the Royal Artillery Barracks (later Le Cateau Barracks) provided facilities for the NCOs, including a shop, bar and recreation rooms on two floors. Red brick with yellow brick and limestone dressings, brick ridge and lateral stacks and slate cross-gable roof. Single-depth T-shaped plan.

The canteen and sergeants mess provided facilities for the NCOs, including a shop, bar and recreation rooms on two floors. Judging from the evidence of the stable blocks, which housed two NCOs each, there were at least 12 sergeants, perhaps more if combined with the Cavalry Barracks. Extensive changes occurred to the internal layout of the service part of the building quite early on and again during the modern training centre phase when lecture rooms and temporary quarters were created. Analysis of the sources, including the listed building description, suggests the building had been vacated by 1998, when the sergeants mess moved to the officers quarters. Judging by the interiors, this happened before the training centre was established, believed to be the 1960s.<1>

The plan form is square, with projecting gable extending to the north-west and a first floor gable on the south-west side. Single-storey service ranges are attached either side of the main south-east elevation, one of which faces onto a contemporary walled yard containing toilets and a coal store to the north-east. A plain modern porch extends from the south-west over the main entrance to the formal areas on both levels.

The structure is built in keeping with the rest of the barrack buildings and aligned with the stable blocks and officers quarters. In contrast to Stable Block A (MCC3112), it has a Victorian ‘villa’ style with bold, quite plain, square elevations and a low roof. Gables project on the least exposed sides, containing gothic flourishes, but the main part of the structure has architectural detail coherent with the stables. Brickwork is again in 9" Flemish bond, with yellow brick and Yorkstone dressings to the eaves and gables, stood on a low chamfered Staffordshire blue plinth. The roof is slate-covered with a central glazed lantern to light the stairwell beneath, used by service staff.