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He was assessed to Land Tax in Dean Street, Fetter Lane in 1739-45 which was the same address as his previous master Edward Vincent. Although in 1748 he gave his address to Goldsmiths’ Hall as Pemberton Row, Gough Square he was assessed at Three Legged Alley, New Street 1748-1754 and Fetter Lane 1755-79.
Joseph Bridges in 1755, Stephen Maton of Holborn in 1760, and Edward Fernell (Grimwade p.508) in 1762 signed to be his apprentices.
He was listed in the 1768 Poll Book as a goldsmith of Fetter Lane.
Grimwade notes that Grundy’s partner Edward Fernell entered his mark alone on 19th January 1780.
The Will of William Grundy, goldsmith late of St Dunstan in the West, proved for probate on 8th January 1780 appears relevant (National Archives reference PROB 11/1060/67).

28 April 1749 William Grundy London Goldsmith paid apprentice indenture duty for Walter Coles.

MCB wrote:Grimwade notes that Grundy’s partner Edward Fernell entered his mark alone on 19th January 1780.
The Will of William Grundy, goldsmith late of St Dunstan in the West, proved for probate on 8th January 1780 appears relevant (National Archives reference PROB 11/1060/67).

Edward Fernell's name is significant among the bequests in this will particularly concerning William's tools, patterns, stock in trade and premises, but as best as I can read it, not without consideration for the stock and premises.