The hall has its origins in a medieval courthouse, used by the manor of Castlerigg and Derwentwater, which was in the ownership of the Radclyffe family by the 16th century. Richard Dudley, of Yanwath, acting as the local overseer on behalf of the "Company of Mines Royal", took a lease on the building from Lady Catherine Radclyffe of Derwentwater, the wife of Sir George Radclyffe of Derwentwater, in 1570. Dudley converted it into a storehouse for "weighing and keeping copper". He wrote to the Secretary of State, Sir William Cecil, in October 1570 to report that the works were ongoing and it appears that those works, which involved "pulling down of the old house", were completed the following year. The upper floor continued to be used as the manorial courtroom while the ground floor was used to store the copper from the mines; once demand for copper reduced, the ground floor was used as a market hall. After the building fell into a dilapidated condition, it was thought to have been rebuilt with stones from the remains of the Radclyffe mansion on Lord's Island in 1695. The freehold ownership of the building passed to the James Radclyffe, 3rd Earl of Derwentwater on the death of his father in 1705; however after James Radclyffe was executed for his involvement in the Jacobite rising of 1715, his property was seized and passed to the trustees of Greenwich Hospital. The current structure, built of lime-washed stone and slate walling, was commissioned by the trustees of Greenwich Hospital in 1813. It was designed with a square tower on the north end with a round-arched doorway and a double flight of steps inside and with what the Keswick Tourist Information Board describes as an "unusual one-handed clock" at the top. The Marshall family acquired the building from the trustees of Greenwich Hospital in 1832. It became home to the Keswick Museum of Local and Natural History, a creation of the Keswick Literary and Scientific Society, in 1873. The museum collection included a three-dimensional model of the Lake District, measuring 12 feet by 9 feet, made by Joseph and James Flintoft in 1837. The building was used for civic assemblies and meetings of the Keswick Urban District Council after it was formed in 1894: the local council acquired the building from the Marshall family in 1896, and the museum moved out to purpose-built facilities in Station Road in 1897. However, it ceased to be the local seat of government when the Allerdale Borough Council was formed in 1974. In the late-1970s a Tourist Information Centre was established on the ground floor, while an art gallery was created on the floor above.
