Mappin Building and Attached Railings

The Mappin Building is an early 20th-century university teaching and laboratory building, designed by Gibbs, Flockton & Teather. It is constructed of brick with ashlar dressings and slate roofs, and exhibits a Baroque Revival style. The building has a plinth and quoins, with modillion eaves. It is three storeys high, plus a basement, and has a 33-window range arranged as 3:8:3:1:3:1:3:8:3. Most windows are segment-headed sashes with 12 and 15 panes, and smaller upper panes, all with brick drip moulds and keystones.

The central block is richly decorated, featuring a projecting centre with rusticated piers and a pediment rising through an open balustrade with corner dies and urn finials. The roof is topped by a domed octagonal lantern. A central Venetian window is flanked by simpler balconies, and above it, a round window with swags. The main entrance is centrally positioned and moulded, with an enriched keystone, ornate iron gates, and flanking lamps on balustrade walls leading to the steps. Large triple glazing bar sashes flank the entrance, with recessed bays and a three-window projection with angle pilasters to the upper two floors and a segmental pediment beyond. At each end is a projecting pavilion, three windows wide, with a slightly projecting centre and angle pilasters, topped with a round window within a projecting pediment. A square domed wooden lantern sits atop the roof. The right return has a five-window block with a projecting centre and a round window within a pediment. A flat-roofed porch with a round-headed doorway and pedimented keystone sits to the right, alongside a two-storey range with a hipped roof and a large ridge stack. The left return is plain with five windows on each floor.

The interior was not inspected during listing. Attached to the building is a spiked cast-iron railing with a brick plinth and stone coping, extending along both sides.