The town hall, which currently includes a museum on the ground floor, is a Grade II listed building.

[3] The new building was designed in the French Renaissance style, built in rubble masonry and was completed in 1871.

[1] The design involved a symmetrical main frontage with a two-stage clock tower facing southeast onto the Market Place; there was a doorway with a wrought iron gate flanked by brackets supporting a canopy in the first stage, a blind niche with tracery surmounted by a pair of trefoils in the second stage and, above that, a mansard roof with projecting clock faces.

[7] The building comprises the council chamber and St Thomas's Hall on the first floor,[8][9] whilst the ground floor of the building was originally a market hall, but became the local fire brigade headquarters (from 1892)[10] and later a seed merchants, with a bank branch at the front (from 1891)[11] and the two town lock-ups at the rear (until 1927).

Items included in the collection included a 17th-century cooking pot from a foundry near Taunton in Somerset[13] and an exhibition associated with the Queen Elizabeth-class battleship, HMS Warspite, which ran aground under tow on rocks near Prussia Cove, 3 miles (4.8 km) to the east of the town, in 1947[14] and was subsequently broken up on Marazion beach between 1950 and 1956.