The school was originally located in East Argyle Street next to the current primary school. The first Gothic building, with four classrooms and a music room and an intended capacity of 500, opened in 1880.[3][4] In 1966, after complaints of overcrowding,[5] the secondary school was replaced by a new building[6] at Campbell Drive, Helensburgh, but when this proved too small, a second building of equal capacity was built beside it.[7] In February 2008 the school was again relocated to a new campus on the outskirts of the town.[2] The school badge features the main entrance of the original Hermitage School.
Robert Williamson retired at the end of the school term in 2020. Prior to joining Hermitage in 2017, Mr Williamson was Head Teacher at Drumchapel High School. Mr Williamson replaced Geoff Urie, who retired in June 2017. The role was filled until October 2017 by David Mitchell, the substantive Head Teacher of Dunoon Grammar School.[8]
Douglas Morgan took up the post of Acting Head Teacher in January 2021.[9] He was appointed permanent Head Teacher in November 2022.
The school's motto is Nulla Virtus Sine Labore, which translates to Nothing Achieved Without Hard Work.[10]
As of November2018[update], the school had 1284 pupils and almost 100 teaching staff.[2]