The building has been described as “one of the few Victorian buildings in the City with interiors worthy of its ornate facades.” It features a pilastered entrance hall with coffered ceiling after
Alessi's Palazzo Cambiaso in
Genoa. The substantial former library (now the members' room) has a gallery and balustraded bridge inspired by the
Rialto Bridge in Venice. It is believed to be the only example of an indoor bridge in the UK. In August 2022 award-winning British artist
Alexander Beleschenko added three new stained glass windows into this room, featuring a contemporary arrangement of over a thousand individual pieces of precision-cut glass - blue, orange, purple, green and yellow squares and triangles arranged against a white grid pattern. LED panels placed behind the glass illuminate it, with the rear surface of the windows being coated with a soft, organic texture to diffuse the lighting. Beleschenko has written an 'Artist's view' of his creative process for the
Architects' Journal, describing the artwork as "a combination of realism and abstraction", inspired by details in the decoration seen elsewhere in the building. For example, the coloured shapes are inspired by stained-glass windows located upstairs, while the grid backdrop references the building’s black and white floor patterns. The windows’ bright hues and decorative shapes collectively help give the room a positive and uplifting feel. The staircase originally featured stained-glass windows by
Henry Holiday, completed in 1898. These were re-installed in 2017, a year ahead of the 125th anniversary of the building's opening, and are now positioned in the entrance to the Great Hall. Holiday's original 1897 watercolour designs for the windows are housed in the Prints, Drawings & Paintings collection of the
Victoria and Albert Museum in London. The council chamber (now the reception room) has a high domed ceiling and elaborate wall-paintings by George Murray to Belcher's designs, representing the Triumph of the Law and Science bringing Order to Commerce. ==Frieze==