An archaeological watching brief was conducted at the School of Pythagoras, St John's College, Cambridge, on the 24th of January 2012. At this time, a test pit was excavated against the northeast wall of the northern masonry wing of the building. This measured 1.32m by 0.62m in extent and was excavated to a depth of 1.0m. The purpose of this investigation was to determine the nature, extent and depth of the building's foundation.