Thanks to the success of fundraising efforts by the newly-formed Dame Allan's Development Trust, the Eighties saw major building work and internal reorganisation at the Schools. The rough ground used to play football behind the A-E block was identified as the next site for development and the Music Centre and Auditorium were built in 1982 along with two classrooms at the end of the back corridor of the Girls’ School. The Music Building was opened in 1983 by former pupil Dr David Lumsden, then Principal of the Royal Scottish Academy of Music and Drama. 

There was also considerable renovation and re-purposing of existing buildings: the Small Dining Hall was converted into four classrooms and the Girls’ Lecture Room into two classrooms. The Boys’ Lecture Room and a Girls’ School classroom became Computing Labs; the Boys’ Sixth Form Centre became a library; and the Boys’ library was turned into an larger Staff Common Room. The Girls’ Junior Library was also rehoused, enabling a new medical room to be created. Throughout all of this, the governors kept an eye to the future and the former ice cream factory at the bottom of the playing fields was purchased in 1987 with future development in mind.