In 1891 he was appointed Canon of the eleventh stall at St George's Chapel, Windsor Castle, a position he held until 1910.

[5] He was installed there on 13 January 1891;[6] and in October–December 1891 he provided cover for Edward Bickersteth (Bishop of Exeter) while the latter was away in Japan.

[7] Remaining a Canon of Windsor, he was also appointed Rector of St James's, Piccadilly, in 1895 (taking up the post after Michaelmas)[8] and beginning to give episcopal assistance to the Bishop of London; he was (additionally) commissioned an Assistant Bishop of London in April 1897,[9] which general commission he retained until his death.

[10] Barry himself then resigned those responsibilities (for the rural deaneries of Westminster, Hampton, and Uxbridge) on medical advice in February 1903 and retired to the cloisters at Windsor Castle.

Another daughter, Mary Louisa (1862–1880) died young and was buried beneath the cloisters of his burial place.