Hart was the son of Percival Hart of Lullingstone and his wife Ann and was educated in the law at the Middle Temple, where he was called to the bar in 1688. He was pricked High Sheriff of Kent for 1706–07.
Hart died aged 72 and was buried in Lullingstone church. He had married in 1689, Sarah,the daughter and coheiress of Henry Dixon of Hilden, Tunbridge, Kent. They had one daughter, Anne, who in turn married John Bluet and Sir Thomas Dyke, 2nd Bt.
- "HART, Percival (1666-1738), of Lullingstone, Kent". History of Parliament Online. Retrieved 30 October 2012.
- Parishes: Lullingstone, The History and Topographical Survey of the County of Kent: Volume 2 (1797), pp. 539-552 Date accessed: 20 October 2010
|Parliament of Great Britain|
Sir Thomas Palmer, Bt
| Member of Parliament for Kent
With: Sir Cholmeley Dering, Bt 1710–1711
Sir William Hardres, Bt 1711–1713
Sir Edward Knatchbull, Bt 1713–1715