A detailed magnetometer survey was conducted over approximately 13.8 ha of arable farmland at Chalks Farm, Sawbridgeworth. An area of probable Romano-British occupational activity has been detected, and includes rectilinear enclosures, trackways, a possible ringditch and other discrete features. Several former field boundaries have been identified while the remaining responses are modern and are a result of nearby ferrous objects, such as electricity pylons, cables and fences.