Norris was signed from local Evostick League Southern side Royston Town in July 2012 on a two-year deal.
Despite only being 18 years old, Norris played over 40 matches as Royston won the South Midlands Premier Division title.
He will spend the next year back on loan with the Crows, gaining valuable first-team experience while still training full-time with the U's goalkeeping staff.