Exterior
Built of coursed, rock-faced Old Red Sandstone with Bath limestone ashlar dressings, natural slate roofs. Large rectangular block at the centre of the town and with show fronts to Cross Street and Market Street, with a market hall in the angle behind. The style is rural Early French Gothic, but with some Italian touches. Three storeys, five windows to Cross Street and three windows to Market Street with a tall clock tower on the corner. The ground and first floors are contained within an arcade of five Gothic arches of a transitional pattern, the centre bay containing the main entrance through to the market hall and the left hand arch under the tower the entrance to the main stair to the council chamber and assembly room, now the Municipal Theatre. The arcade is of steeply pointed Gothic arches divided by Romanesque piers with stiff-leaf capitals. The stair door has colonettes, plank doors and an elaborate rose window with six vertical recesses below in the arch head. The other arches are slightly wider, with the market entrance closed by iron gates and the other three shop windows, glazed in three vertical lights, with the lunettes over glazed as triple sashes and lighting the mezzanine. The second floor has five 2-light windows with 1 over 1 pane sashes, divided by a central colonette, Caernarvon heads and paired cinquefoils in the tympanum. Double cill band with shields between. Eaves on stone brackets, large pitched roof hipped at the Market Street end and gabled at the other and with three vent cowls on either side of the ridge.
The lower stages of the tower are part of the main elevation. The first free-standing stage has three arrow slit windows to each face, over which is the clock dial, white with block letters (illuminated at night), black on the north side (see History), over this is the belfry stage with bell louvres, each 4-light with colonettes. Of these features only the clock face appears on the rear elevation of the tower. The top of the tower has machicolated battlements, a fretted balustrade and corner tourelles. These, and the central pyramid roof, are covered in copper and the bright green hue makes them easily visible at distance.
The Market Street elevation is in three bays with the features as before.
The far gable end looms high above The Kings Head Hotel and has a large plate tracery rose window with a central quatrefoil surrounded by eight smaller ones. Arch braced tie-beam gable truss, stack on gable.
The rear elevation is mostly covered by the market hall roof, but the Market Street end has an additional second floor window as before and the top half of a second one. There is also a large central stack on the rear wall.
The market hall projects across the whole rear and has two gabled roofs, the smaller on the left. Plain blind long walls. The large gable has seven graduated windows with a circular window above the largest and widest one in the centre. The smaller gable has three windows. The roofs have a wide glazed section along the ridge.