Sandby designed a carved oak altar-screen for St. George's Chapel, Windsor Castle, and a stone bridge over the Thames at Staines, opened in 1796, but removed a few years afterwards on account of its insecurity. He built several houses in the neighbourhood of Windsor, including St Leonard's HillSt. Leonard's Hill, Windsor for the Duchess of Gloucester, and one for a Colonel Deacon, later known as "Holly Grove". Designs exist for many others of his architectural works which cannot now be identified. In 1777 he was appointed, jointly with James Adam, architect of his majesty's works, and in 1780 master-carpenter of his majesty's works in England.
