The project included expanding into the lot next door, increasing the size of the stage and auditorium, returning grand circle seating, and improving accessibility and facilities front of house and backstage.

[9] The redevelopment was designed by Adelaide-based COX Architecture and built by Hansen Yuncken, managed by the South Australian Department of Planning, Transport and Infrastructure and Adelaide Festival Centre Trust.

Uncle Mickey Kumatpi Marrutya O'Brien, a senior Kaurna and Narungga man, marked the official completion with a Welcome to Country and smoking ceremony.

Two curving staircases in the expanded main foyer and other features retain some of the original Edwardian-era Art Nouveau elements, including a pressed metal ceiling,[12] elegant architraves and mouldings.

[9] Other features include custom-built curved timber balcony fronts in the auditorium, foyer bars on all three levels, a larger backstage rehearsal room and a huge glass façade to the new west wing.

The wall is covered with signatures from visiting stars, including Julie Anthony, Rowan Atkinson, Lauren Bacall, Alan Cumming, and Barry Humphries.

[9] The theatre is managed by a statutory authority, the Adelaide Festival Centre Trust, and owned by this entity since it was bought from Arts SA for A$8 million in July 2017.

During this time he called on the South Australian Government to hold design competitions for large public buildings, and the SAIA also became an allied member of the Royal Institute of British Architects.