Aberdeen Town House, Castle Street, Aberdeen

Aberdeen Town House, situated on a prominent corner site in the city centre, is a major municipal building constructed between 1868 and 1874 to the designs of architects John Dick Peddie and Charles George Hood Kinnear. It incorporates the surviving portion of the earlier Tolbooth, built between 1615 and 1629 by Thomas Watson of Old Rayne, and is adjoined by the City Chambers facing Broad Street, a 1975 addition by the Aberdeen City Architect's Department, with Ian Ferguson and Tom Campbell Watson serving as chief architects.

The principal Town House of 1868-74 is a four-storey building with an attic storey, comprising sixteen bays in the Scots Baronial style. It features a prominent square-plan clock tower to the west, rising five stages with corbelled and bartizaned detailing, topped by a finialled and crocketted spire. The entire structure is constructed of grey granite ashlar, with a base course, string courses, cill courses and a parapet. The ground floor displays segmental-arched arcading, whilst the first floor contains smaller round-arched openings. Small gabled roof dormers with finials punctuate the skyline.

The Castle Street elevation is dominated by a central six-panel two-leaf timber entrance door. The central five bays feature double-height segmental-arched openings at the second and third floors, incorporating bipartite windows with multifoil openings above. An advanced bay to the far right encloses the earlier Tolbooth behind. A vertical metal sundial is mounted high on the wall to the far right, inscribed with the Latin motto "UT UMBRA SIC FUGIT VITA" (Life flies like a shadow). The tower to the far left contains a round-arched doorway with steps leading to a timber and glass revolving entrance door surmounted by a semi-circular fanlight. Above the entrance is a corbelled balcony, and the fifth stage of the tower incorporates louvred openings with clock faces set within the gables above. Windows throughout the street elevations are predominantly plate glass set in timber sash and case frames. The roof is covered in grey slates with tall, narrow, coped ridge chimney stacks.

The earlier Tolbooth, dating to the 17th century, is a rubble-built, square-plan castellated tower with a corbelled balustraded parapet and clock faces on three sides, now substantially enclosed within the later buildings. Its polygonal steeple features blind round-arched openings and a decorative lead spire. It is internally connected to the adjacent nineteenth-century Town House to the west.

The interior of the Town House, inspected in 2007, displays impressive decorative schemes incorporating detailing from both the seventeenth and mid-nineteenth centuries. The municipal offices and courts feature a central granite imperial staircase with a galleried landing, alongside a tall open-well spiral staircase with decorative cast iron baluster and timber rail. The main reception hall is notable for its timber panelling and a fine decorative timber hammerbeam roof, complemented by a minstrels' gallery. Additional spaces include timber-panelled rooms with coffered ceilings, one of which displays heraldic shields, throughout with decorative plaster cornicing, four and six-panel timber doors and several large classical granite chimneypieces. The courts are largely modernised, though one retains original timber pews, gallery and bench. The Tolbooth preserves stone-flagged floors, a narrow spiral stair and several small internal rooms, some of which are vaulted with original heavy timber iron-bound yetts. At the west wall is a remnant of round-arched pilastered arcading and a timber bell frame.

The City Chambers to Broad Street, completed in 1975, is connected to the Town House by a raised corridor. It is a four-storey flat-roofed structure featuring paired vertical full-height columns with contrasting grey walls. Pilotis to the north create an open space beneath the first storey, whilst a curved advanced window appears on the west elevation at first-floor level. The majority of windows are narrow vertical openings. The interior, as seen in 2007, maintains a 1970s decorative scheme encompassing a cantilevered steel staircase and a double-height timber-panelled council chamber.