[8] This would lead to the construction of a new high school building at Acton, which was opened in November 1954.

The high school would move to its present location in 1977, with the building being officially opened in November that year.

[5] In September 2021, because of declining high school enrolment (mainly triggered by the increasing preference of Acton's Catholic families to send their children over to Georgetown's Christ the King Catholic Secondary School),[12] Acton students in grades 7 and 8 would have their classes transferred over to that building.

The 2019 Fraser Institute Report Card on Secondary Schools gives ADHS the following ranking:[2] During the 1960s, ADHS athletes accrued a notable record in track and field events, winning three individual OFSSA championships, accepting four related athletic scholarships to US colleges, winning a CWOSSA cross-country title, and competing in British Empire Games or Olympic trials three times.

[15] Until 1971, Acton competed in the Central Western Ontario Secondary Schools Association (CWOSSA), at which point it opted to take a hiatus to concentrate on intramural sport.