He was admitted advocate on 20 December, 1743, Appointed Sheriff of Perth in June 1754, in April 1766 he became solicitor for renewal of leases of the bishops' tithes, and solicitor and advocate to the commissioners for plantation of kirks in Scotland.
At this time he had legal offices on Browns Square on the southern edge of Edinburgh.
[4] Swinton House, his main country residence, burned down in 1797 and was not rebuilt until after his death.
[5] He retained both appointments till his death, at his residence, Dean House, Edinburgh, on 5 January 1799.
His fourth son, Lt Col Robert Swinton (1773-1821), is memorialised in St John's Churchyard on Princes Street in Edinburgh.