In Rising Damp, on ITV, Rossiter played Rigsby, the lecherous landlord of a house converted into seedy bedsits, reprising the role from the successful stage version, The Banana Box. While he was in Rising Damp he also took the lead role in The Fall and Rise of Reginald Perrin, adapted by David Nobbs from his own comic novels and aired on the BBC. Rossiter was given a surprise tribute on This Is Your Life in 1975. He appeared in I Tell You It’s Burt Reynolds, an episode of the 1977 Yorkshire Television series The Galton & Simpson Playhouse, as well as the short films The Waterloo Bridge Handicap (1978), and the Galton and Simpson-scripted Le Pétomane (1979). After his portrayal of Reginald Perrin, Rossiter's non-comedy roles on television became less frequent, although there were exceptions such as a debt collector in the one-off HTV thriller Machinegunner (1976), and Frank Harris in Fearless Frank, or Tit-bits from the Life of an Adventurer (1978), a BBC Play of the Week.