At the school annual speech day, held in November 1959, the current headmaster of St Andrew’s, Mr B. E. Knight reported that the diocese were looking towards the construction of a new school building. This was following the recent construction of the new Archbishop Tenison’s school, the Church of England grammar school. By 1959, St Andrew’s had been a secondary modern school since 1951 – at which time the primary years had been removed, but the school continued in the same Old Town premises close to the Church and Church Hall. These premises were small and not well suited to the secondary modern curriculum. The consideration by the diocese for the creation of a new, custom built premises was welcomed by Mr Knight in his speech.
The plans took a little longer to realise than expected, however. Croydon council were considering a major development that would impact heavily upon Old Town. The construction of Croydon Flyover, allowing traffic to pass uninhibited between central Croydon and Wallington, would require demolition of the part of Old Town lying under its footprint. The old school was included in the development area, and so the move to new premises was now necessitated by this work.
The new school would be completed by 1964, with modern facilities including a custom built block fro woodwork, metalwork, science, art and domestic science. This would be coupled with more traditional teaching rooms in an attractive site on Duppas Hill. Croydon council supplied the playing fields and retained ownership of these, whilst the diocese took responsibility for the new secondary modern school.