The Wellingborough County High School was founded in 1907, and moved into the Broadway site in 1911, and the grammar school site was finished in 1930, on Doddington Road.

The first site of the school is situated on the A5193 (former A509) in the south of the town, just west of the hospital, on London Road and Broadway (52°17′47″N 0°41′19″W / 52.2963°N 0.6887°W / 52.2963; -0.6887 (Wrenn School, London Road site)).

The Doddington Road site, formerly the boys' grammar school, houses years 9-11 along with the Art and Design Technology buildings, and the Roseacre Playing Fields site, for Physical Education, is situated directly opposite the main Doddington Road building.

The oldest buildings are those of the former grammar school, and the most modern additions are the all-weather pitch (AstroTurf) and pavilion, constructed in 2004 and the music block, constructed in 2006.

[14] The Northamptonshire County Council-run “Music and Arts Centre” takes place every Saturday morning in the Wrenn School, at the London Road site, and the festival band has achieved national recognition in the finals of the national festival of music for youth.