The arts centre has been created from a complex collection of historic buildings, including a courthouse and a town hall, which have been retained and restored.
A new foyer has been inserted into a former courtyard. It is partly enclosed by the original walls and partly glazed on upper floors.
A new staircase and lift in the foyer give access to all parts of the centre. To accommodate the seven varying levels of the original and new parts of the building, the staircase changes in direction - from straight to angled dogleg, to handed angled dogleg - as it rises.
Walkways of perforated steel plate supported by steel beams connect the flights to all parts of the building.
Each staircase consists of a pair of 250 x 12mm steel strings with 50 x 50 x 5mm angle supports at the back and paired 50 x 50 x 5mm angle supports at the front.
The strings were welded at their ends to the walkway steelwork.
Upper flights are additionally supported with a 60mm-diameter solid steel rod which is suspended from the roof structure.
The balustrade is a series of paired 70 x 10mm steel flat balusters bolted to each side of a 10mm-thick steel cleat welded to the string. They are braced by an elliptical beech handrail incorporating a 12 x 50mm steel stiffener and by a 50 x 12mm steel flat running below the handrail. Panels of Expamet-expanded metal mesh - in frames of 40 x 3mm steel angles are fixed to the balusters.
Two half-landings are fitted with curved shelves formed from steel plate welded to the 50 x 12mm flats and supported by struts welded to the balusters.