Originally, the seating capacity was 800 on 4 levels. The top level has been closed thereby reducing the seating capacity.
In 1968, a redevelopment of Covent Garden was proposed by the Greater London Council. Under threat of demolition were five theaters: the Garrick, Vaudeville, Adelphi, Lyceum and Duchess theatres. A campaign called Save London Theatres was launched by theatre owners, the Musicians' Union and Equity. The campaign was successful and the redevelopment was shelved.
The gold leaf auditorium was restored in 1986. In 1997, the front facade was redone as well.