The village of Costock is around five miles to the north-west of Loughborough and eight and a half miles to the south of Nottingham City Centre. The church lies at 52.25m OD. The groundwork was carried out under archaeological observation. All deposits were inspected in order to identify any archaeological remains of interest in particular those medieval or earlier in date, (including church foundations). Where possible these were cleaned by hand, examined and recorded. The groundworks comprised the excavation of one area, a single trench 14.4m in length, 0.35m in width and up to 0.85m in depth extending from the south-west corner of the nave to the churchyard boundary wall to the west. Due to the trench collapsing 4.5m to the west of the nave it was widened by up to 0.95m for a short distance. The archaeological work has identified the fourteenth century foundations of the nave which have been repaired, almost certainly during the restoration of 1862 when the west end of the church was rebuilt. The complete absence of in-situ burials or other significant archaeological remains encountered during the trenching through the churchyard is likely to be due to the limited scope of the work carried out which ensured that the destructive impact on the archaeology was minimal.