Syfy has come out and prepared Being Human fans for the end:
The show has been canceled, effective at the end of Season 4.
In a statement from Syfy, the network says:
“Showrunner Anna Fricke and the talented producers, writers, cast and crew have done an amazing job bringing this show to life over the past four seasons and we sincerely thank them and the series’ production company Muse Entertainment for their hard work.
"They’ve saved the best for last with the final six episodes that revisit the story’s beginning, leading to a not-to-be-missed send-off for Aidan, Sally, Josh and Nora.”