During construction, on 26 January 1833, two workers were killed when a 70-foot crane constructed to install the roof trusses broke and the pulley block failed. John Heap died instantly and William Badger died a few days later from his injuries. They were buried in St Philip's churchyard and a memorial, consisting of a pillar base made by one of the workmen for the Town Hall, was dedicated to them. Architect Charles Edge was commissioned in 1835 to repair weaknesses to the design of the building. He was also commissioned for the extension of the building in 1837 and again in 1850.