Born on 27 October 1735, he was eldest son of James Newton, a cabinet-maker, of Holborn, London, and Susanna, daughter of Humphrey Ditton.
Admitted to Christ's Hospital on 25 November 1743, he left, on 1 December 1750, to become apprentice to William Jones, architect, of King Street, London.
In September Stuart, then in ill-health, asked Newton to assist him with the designs for rebuilding Greenwich Chapel.
[1] Stuart died on 2 February 1788 and Newton completed Greenwich Chapel two years later, and carried out other works connected with the hospital.
[1] Newton, himself in bad health due to overwork, left Greenwich on a three months' leave of absence, for a course of sea-bathing, on 10 February 1790, and died soon after, on 6 July, at Sidford, near Sidmouth, Devon.