Off contract at the end of this year, Fulton will now remain at Wests Tigers until the end of the 2016 season.
The representative forward made his NRL debut for Wests Tigers against the Warriors in 2003 and is a key member of the pack.
“I’m really pleased with this new contract. Wests Tigers mean everything to me and I can’t wait for the season to begin,’’ Fulton said.
“To be a one NRL club player means a lot to me. I’ve still got plenty to offer and I’m looking forward to developing my game even more over the next few seasons under our new Coach Mick Potter.”