Coggeshall was born in Codham Hall on 20 July 1358. He was the son of Sir Henry Coggeshall (d. 1375) and Joan Welle, the daughter and heiress of Sir William Welle of Great Sampford, Essex and Well Hall in Exning, Suffolk. Coggeshall was the nephew of the MP, Thomas Coggeshall.
His second wife was Ricarda Inkpen (died September 1390), daughter and heiress of John Inkpen of Inkpen, Berkshire. She was the widow of William Huish of Huish, Devon and of Sir Thomas Fichet of Spaxton, Somerset. Before May 1394, he married for a third time, to a woman named Margaret.
He was appointed Sheriff of Essex for 1392, 1405 and 1412. In 1381 he was one of the commissioners appointed to suppress the Peasants' Revolt. He was a Justice of the Peace for Essex in 1401–1407, 1417–1419 and 1422–1426.
- The Hist. Antiq.’s of Hertfordshire, Chauncy, 1826, P45. (S) Gen. Memoirs of the Extinct Family of Chester of Chicheley, Waters, 1878, P308.
- "COGGESHALL, Sir William (1358-1426), of Codham Hall and Coggeshall, Essex. - History of Parliament Online". www.historyofparliamentonline.org.
- "COGGESHALL, Sir William (1358-1426), of Codham Hall and Coggeshall, Essex". History of Parliament Online. Retrieved 15 April 2012.