Founded in 1901 as a small preparatory school for boys, it soon expanded to provide secondary education owing to its increasing popularity.

In 1901, Bishop Cahill of the Diocese of Portsmouth invited the Salesians of Battersea to take over the orphanage, a former tin factory, in Queen's Road, Farnborough.

Under previous Headmaster, Mr Wilson, the College witnessed substantial structural growth, the most significant being the erection of the Sean Devereux Sixth Form Centre providing facilities for girls, and new classrooms built equipped with improved technology.

Further expansion works continued, and in 1997, the Delmer building was completed, providing the school with new ICT facilities, art rooms, staffroom, a Technology Suite, general teaching classrooms as well as new office accommodation.

In 1998, the Sean Devereux Sixth Form centre was fully refurbished as well as extended in terms of size and accommodation.

The process began during the 2012–2013 academic year and the new Father Brendan McGuinness Music Building was completed and officially opened in September 2013.

By Year 9, boys are prepared for Key Stage 4 with a GCSE Foundation Drama Club, which aims to expand on the learning of "more able and keen actors".

[10][better source needed] The school's 2023 GCSE results saw 97.2% of boys having achieved at least ten grades 9-4 each, including in the core curriculum subjects of English and Maths.

The OSA regularly assists the Salesian family in various local undertaking and around the world by activity or financial aid.