The 29-year-old, who admits that he has never previously played rugby league, is very excited about joining his hometown club.
"I think it is a big challenge in a sport that I've never played before, but it's one that I'm really excited about and I'm feeling positive about working with the coaches moving forwards," he told the club's official website.
"Lee [Radford] played a few games for Hull RUFC and all the guys there gave him some great feedback so I'm really looking forward to working with him.
"Adam [Pearson] has outlined how ambitious he is as a person and where he wants to get the club going and I'm delighted to be given the opportunity to be part of that."
Biggs was on the books of Hull City in his football-playing youth. He began his rugby union career at Leeds Carnegie in 2004.
He then had spells at Harrogate RFC and Newcastle Falcons, before joining Bath in 2010.