 He inherited his father James Broadwood's (b1697 Oldhamstocks) profession, that of a wright or carpenter/joiner, and as a young man walked from Oldhamstocks to London, a distance of almost , where he worked for the harpsichord maker Burkat Shudi.Burkat Shudi died in 1773, and John Broadwood took control of the company from his brother-in-law in 1783.Broadwood is credited, together with Robert Stodart, founder of another famous firm of piano makers, of helping Americus Backers to perfect the English Grand Action, which remained in use by many makers virtually unchanged for 70 years and, in Broadwoods' case over 100 years, and continued in use in various improved forms until the early years of the 20th century.