The venue is a refurbished 1895 auditorium, upstairs from the Gatehouse pub, which has served over the years as a music hall, cinema, Masonic lodge, and a jazz and folk music club that once hosted a performance by Paul Simon. Today, the venue hosts theatrical and cabaret productions. It has presented a mix of off-beat and mainstream shows, including an all-female version of Hamlet, modernistic interpretation of opera classics and new musicals and dramas.
In December/January 2017/18 they staged a sellout run of Top Hat which won best choreography in the 2018 Offies Awards.
Upstairs at the Gatehouse was created by Ovation Theatres Limited (Directors John and Katie Plews). The company has owned the theatre since 1997. The Gatehouse pub is owned and operated by Urban Pubs.