Meeting room, former muniment room and cells on south side of Guildhall

This complex consists of a meeting room and former muniment room and cells, built in the early 20th century as additions to the south side of the Guildhall. They are situated against the east side of the Atkinson block and the southern property boundary.

The muniment room and cells are built of cream brick in a Flemish bond pattern, and orange brick in an English bond pattern; the roof is not visible. The meeting room is constructed of magnesium limestone ashlar and orange brick in English bond, with a slate roof.

The buildings extend a single storey and have flat roofs. The front elevation faces north, overlooking a narrow yard and the south side of the Guildhall. The meeting room, to the left, is built of magnesium limestone. It features a slightly projecting central gable with coping stones and kneelers, and a slate roof with two glazed ridge lights and two small ridge ventilators. A doorway and two square-headed windows with three-over-three pane sash windows are positioned at the left-hand end. The central gable section has two square-headed windows with two-over-two pane sash windows and a doorway with a panelled door to the right. The right-hand end has two square-headed windows that have been blocked with brick. The outer east gable wall is built of magnesium limestone with coping and kneelers, while the inner gable wall is partly obscured and features a cream brick apex.

The single-storey, flat-roofed building abuts the right-hand side of the meeting room, returning at the right-hand end to meet the east wall of the Atkinson block and the south side of the Guildhall. Its front elevation is built of cream brick in a Flemish bond pattern, with concrete coping and two rectangular windows set within ashlar block frames. The left-hand window has a grid of iron bars, and the right-hand window is blocked and obscured. A narrower, blocked window with remaining bars is present on the return elevation, alongside a doorway with a studded timber door.

The south, rear elevation presents a patch of cream brick at the left-hand end, with the remainder being constructed of orange brick and incorporating various blocked windows and concrete coping. At the right-hand end, the meeting room has a projecting, flat-roofed outshot with a pedestrian gateway, leading to a pathway into the yard in front of the Guildhall. The meeting room has a large eaves stack of cream brick to the left and a smaller one to the right, along with a small central dormer window.

The interiors of the meeting room and the muniment and cells building have been altered and do not retain special architectural or historic interest.