The school was founded in 1947 as the Chesham Technical School - a result of the Education Act 1944 which set up the tripartite arrangements of grammar, technical and secondary modern schools. The all-boys' school was originally housed in only one building, which is now the sixth form block known as "The Curtis Centre". In 1961, the school became known as Chesham Technical High School and during the 1960s, there was huge development in the area, and it became a co-educational grammar school.
Founded in 1947 as the Chesham Technical School due to the Education Act 1944, which set up tripartite schools including grammars and technical institutions. Initially housed in one building called "The Curtis Centre", it became known as Chesham Technical High School in 1961. The area saw substantial development during the 1960s, transforming into a co-educational grammar school.