Norris was already a lawyer of some local repute by the time of his first return to Parliament in 1388. That same year he acted as an attorney in the court of common pleas in a suit over land in Devon, and when up at Westminster for the Parliament of 1391 he became similarly involved in another case in the same court, then appearing for the plaintiff, John Denys of Gidcott, against Sir Henry Ilcombe, as overlord at Penrose (Cornwall). Both suits raised complex questions of law, and it says something for the respect in which Norris was held that he continued to be retained as attorney by Denys for the six years and more the litigation continued.
Norris was one of a small group of Devonshire lawyers notable not only for their parliamentary service for more than one borough but also for their links with Edward Courtenay, earl of Devon; and it may well be, in Norris’s case at least, that his standing with the Courtenay family in some way influenced the burgesses when making their choice of representatives. By 1390 he had become a friend and feoffee of the earl’s attorney, Thomas Raymond of Holsworthy,
For about 15 years from 1397, Norris held a lease from the Exchequer of a moiety of a water-mill and other premises in Collumpton (Devon), and for much of the same period a further lease of the manor of Rame in Cornwall.
