The results of a geophysical survey carried out by South West Archaeology Ltd. (SWARCH) on land at Caerhays Barton, St Michael Caerhays, Cornwall, as part of the planning submission for the proposed erection of an agricultural barn. The site comprises the southern end of a sub-rectangular field to the north of Caerhays Barton. The survey identified nine groups of geophysical anomalies. These were predominantly linear anomalies probably related to modern services and ditch features. The identified anomaly groups include: four ditch features; one possible drainage feature; three modern services; and one pit. Evidence of metallic debris and ground disturbance was also identified. The results of the geophysical survey would suggest that the archaeological potential for the site is moderate. The alignment of some of the identified features matches that of existing field boundaries, indicating that they may belong to an earlier phase of the same fieldsystem. Other linear features appear to follow a slightly different alignment and may belong to an earlier fieldsystem, perhaps associated with the Prehistoric settlement identified immediately to the south of the site. However, numerous buried modern services cross the site and these serve to obscure the results. One of these appears to follow the line of a cropmark visible in the field to the south.