William Singleton was charged with on 30 May 1791 "felioniously stealing" 27 yards (25m) of linen from a warehouse, the property of Matthew, Pickford & Thomas Pickford. William had been working as a warehouse porter in London. William was found guilty and sentenced to seven years transportation.
William arrived in Sydney, New South Wales on the Pitt on 14 February1792. Coming free on the same boat was his wife Hannah and two youngest sons, Benjamin and Joseph. Six more children were born to William and Hannah in the period from 1793 to 1806.
William received an absolute pardon on 23 April 1795.
In 1797 the family settled on a 90 acre (36 ha) grant at Mulgrave Place (near Windsor), where their eldest son, James, then aged 30, joined them in 1809.
His sons James and Benjamin built water-mills at Kurrajong, Lower Portland Head, and on James 50 acre (20ha) grant at the Hawsbury. At their water-mills they ground wheat for the government stores. His son Benjamin also built a water-mill on his 200 acre (81ha) grant at Patrick's Plains, and another water-mill together with William's other son Joseph at Boatfalls.
William's son Benjamin became an explorer and founded the township of Singleton on his 200 acre (81ha) at Paterson's Plains.
In 1813 William's wife Hannah died at Wilberforce.