This report presents the results of a geophysical survey and archaeological evaluation trenching that were carried out by South West Archaeology Ltd. (SWARCH) for an agricultural development on land at Trevassack Farm, Constantine, Cornwall. The geophysical survey followed the guidance that is outlined in: Geophysical Survey in Archaeological Field Evaluation (English Heritage 2008); Standard and Guidance for Archaeological Geophysical Survey (CIfA 2014); and EAC Guidelines for the Use of Geophysics in Archaeology: Questions to Ask and Points to Consider (Europae Archaeologiae Consilium/European Archaeological Council 2016). The archaeological evaluation trenching was carried out in accordance with a trench plan that was drawn up in consultation with the Historic Environment and Planning Advice Officer (HEPAO) at Cornwall Council. The geophysical survey identified six groups of anomalies across the site. The anomalies were predominantly linear ditch and/or bank boundary features that are associated with phases of the existing and the historic field system, with possible prehistoric settlement activity, and with agricultural practices. Furthermore, possible pits and/or tree throws and anomalies that are associated with metallic debris and with ground disturbance were apparent. The results of the geophysical survey would suggest that the archaeological potential of the site is moderate, though the majority of the identified features, including the possible round ditch, are located outside of the proposed development area. A total of two archaeological evaluation trenches were excavated across the proposed development area, however no archaeological features or deposits of any significance were revealed and this would suggest that the core of any prehistoric settlement activity lies outside of the proposed development area.