In April 1805, Lucas returned with his family to
Sydney in the . The ship carried materials for a government windmill which Lucas was to erect in Sydney, and he was allowed to carry materials for another windmill for himself.
The Sydney Gazette and New South Wales Advertiser. Dated 23 June 1805. An excellent Post Mill, the first that has been erected in the settlement is now completed by Mr Nathaniel Lucas, behind Back Row East. It was undertaken and finished within the space of six weeks; has been for several weeks at work, is capable of grinding, with a sufficiency of wind, upwards of six bushels per hour, which was last week accomplished for 12 hours successively. In 1808, Nathaniel was appointed superintendent of carpenters in Sydney 3 Jan 1810 Nathaniel was noted to be on the list of persons holding civil and military employment at Sydney and settlements adjacent, as Superintendent of Carpenters. During the construction of the
St Luke's Church in 1818, which was designed by
Francis Greenway, Greenway alleged that Lucas was much addicted to the bottle and that he was using very poor stone at the church. ==Death==