Peter Caldwell was the designer on 175 episodes of Coronation Street from December 1963 to May 1965 with further stints in the role from September to November 1966 and May 1967. He was the second person to work in the role on the programme after its initial designer, Denis Parkin, who had first created the world of the Weatherfield from the scripted descriptions and visits to the terraced streets of Salford.

December 1961 TVT 1

Peter Caldwell's illustration of Coronation Street for a December 1961 edition of TV Times

Caldwell had worked closely with Parkin before taking on the role and in December 1961 provided a detailed illustration of Coronation Street and its environs to TV Times for a special pull-out.

He also designed nineteen episodes of the second season of the Coronation Street spin-off Pardon the Expression in 1966.

Among his other work as a staff designer for Granada Television were sets for Skyport, Knight Errant Limited, The Man in Room 17, The Fellows, City '68 and The Dustbinmen. In the early 1970s he moved to Yorkshire Television where his work could be seen on Beryl's Lot, Wilde Alliance and the comedies Rising Damp, Hallelujah! and In Loving Memory.