Report on an archaeological watching brief on geotechnical boreholing and four service location test pits at 28 St Dunstan's Street, Canterbury in May 2010. The borehole data showed a greater depth of deposits of potential archaeological interest than the test pits. The deposits largely represent fills of medieval quarries and 11th-12th century pottery and glazed peg tile suggests a medieval date for the earliest quarry fills. Evidence of unidentfied sturctures and metalling, perhaps fronting St Dunstan's Street, was also found. No human remains were retrieved, but Romano-British inhumations may still be present as at 25-26 St Dunstan's St.