Architectural changes have been made to the building over the years, the latest being in 1968 when a modern-style extension was added to the north of the theatre.

[1] In 1911 the Liverpool Repertory Theatre Limited was established, with Basil Dean as its "controller and producer".

[3] The auditorium and the basement foyer were redesigned by Stanley Adshead, the Professor of Civic Design at the Liverpool School of Architecture.

[4] The theatre was for many years managed by Maud Carpenter,[5] while Ronald Settle was Musical Director from 1945 to 1971.

[1] In 1968 a modern-style extension was added to the north of the theatre to accommodate new foyers, bars, dressing rooms and a workshop.

According to The Times: Other future stars who learned their craft at the Playhouse under Armstrong included Michael Redgrave, Rex Harrison and Robert Flemyng.

Other artistes who gained experience at the theatre include Lilian Braithwaite, Cecil Parker, John Gregson, Clive Brook, C. Aubrey Smith, Richard Burton, Patricia Routledge, Anthony Hopkins, and Richard Briers.

On the ground floor the central bays contain three entrances, separated by pillars, which lead to a recessed porch.

[11] In its description, the list quotes the Architects' Journal of 1968 which says of the older section that it is "significant as an early and rare work by one of the pioneers of the Liverpool School of Architecture, in the Grecian style favoured by the school at that date", and of the newer section that it is "a brilliant concept, joyously realised, which exploits asymmetrical volumes and ever varying spaces yet achieves unity and also balance with the adjoining Victorian façade".

[12] In the Buildings of England series the architectural historians Richard Pollard and Nikolaus Pevsner say of the newer section that it is "a spectacular composition" which creates an atmosphere of excitement and anticipation, exactly right for a theatre foyer".