North Hall, now part of Glebe Farm, owned by Mike Lamb and Margaret Rogers, was one of seven medieval manors that made up the parish.
Archaeologists first looked at the site in 2012 and have returned each year.
Last year they uncovered stonework which may have been part of the house, along with pottery from the 13th or 14th century.
They believe that the ditch on the edge of the field is actually the remains of a moat, with a raised earthwork, built to defend the manor house.
Story: P Goodwin, The Plymouth Herald | Photo: The Plymouth Herald