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.
The school was established in 1947 as the Chesham Technical School - a consequence of the Education Act 1944, which introduced tripartite arrangements including grammar, technical, and secondary modern schools. The all-boys' institution initially resided in one building, now known as "The Curtis Centre". In 1961, the school was renamed Chesham Technical High School, and during the 1960s, significant development occurred in the area, transforming it into a co-educational grammar school.