A water-mill called Wonham's was first mentioned at the beginning of the 14th century. In 1328 Edward III granted to the priory of Reigate the 'water-mill at Wonham with pond, watercourses, Formerly in the tenure of William de London and Roger de London,
At the dissolution of Reigate Priory, the mill and grounds, Were (granted or leased) to William Hevyr, By 1678 the mill was part of the Wonham estate, and in 1740 the current redbrick building with its elegant Georgian miller's house replaced the earlier buildings.
The mill was extended and refitted in 1914. Wonham continued until 1930 when new owner Joseph Rank dismantled and removed all of the machinery. During the Second World War, the mill was requisitioned as a Ministry of Food store, before being purchased by a, feed and grain merchant who installed a drier and silos adjacent to the main mill. Due to its relative isolation and falling profits, however, the mill was closed in 2006. The premises were subsequently bought by property developers who planned to turn them into luxury flats. Work began in 2007 but was halted under a year later for reasons unknown. By 2009 the buildings stood abandoned and partly demolished, large holes gaping in the side of the mill tower.
Work resumed on the buildings in 2011. By 2013, the conversion was complete, the mill transformed into an 'exclusive' collection of 'outstanding' properties.