The collection covers the history of performance at Sadler's Wells as well as the buildings which have occupied the site, the personalities who have managed and performed at the theatre and the many financial difficulties Sadler's Wells has survived throughout its lifespan. This material includes:
- Playbills (1793-1890)
- Theatre programmes (1869 to present)
- Production posters (mainly 1930s and 1970s-1990s)
- Musical scores, including songs by the clown Joseph Grimaldi and Charles Dibdin (early 19th century to mid 20th century)
- Scripts of plays and pantomimes (early/mid 19th century)
- Newspaper cuttings, including early performance notices (1730s onwards) and criticisms (1770s onwards) and more recent cuttings including albums compiled by dates or themes
- Scrapbooks and commemorative material (1920s-1980s)
- Biographical material, concerning individuals including Grimaldi, actor/manager Samuel Phelps and the Dibdin family of dramatists/managers
- Photographs (loose and in albums) of productions, sets and actors (1930s-1990s)
- Illustrations and descriptions of the Sadler's Wells theatre buildings (mainly 19th century)
Around half of the collection comprises 20th century administrative records, including:
- The Sadler's Wells Fund, established in the 1920s to save the theatre for the nation and to construct a new building which opened in 1931
- The Sadler's Wells Foundation, a charitable trust established to continue funding the theatre (1925-1980)
- Theatre management, including financial, administrative, staff and publicity records and material concerning further financial difficulties (1920s-1990s)
- The Sadler's Wells opera and ballet schools (accounts, administration, student records, 1934-1951)
- Production files for national and international tours and visiting productions (administrative/financial papers, photographs, cast and staging information, 1950s-1990s)
- Arrangements during the Second World War, when Sadler's Wells was used as an air raid shelter
- Building records (plans, consents, correspondence, 1920s-1990s)