The 20-year-old, who signed professional terms at the club in July 2000, has made great strides in the last 12 months and has been awarded England caps at under-20 level.
He featured strongly during the pre-season campaign and has been No.2 goalkeeper since the departure of Neil Sullivan in late August.
Meanwhile, midfielder Nicky Wettner, 18, has been released by the club. We wish him well for the future.
Goalkeeper Robert Burch has signed a two-year extension to his current deal.