This report sets out the results of an Archaeological Watching Brief that was carried out on the 18th, 26th, 27th and 28th November 2012 during the groundworks associated with the erection of a two-storey extension to the rear (North) elevation at The Quaker House, High Street, Thornton Le Clay, Malton, North Yorkshire (SE 6851 6517). The Watching Brief was undertaken to fulfil an archaeological condition attached to the Planning Application Consent (12/00318/HOUSE) for residential development at the site. The archaeological work involved monitoring the removal of overburden and topsoil within the proposed footprint for the new extension down to their finished floor level. The excavation area for the proposed extension formed a large L-shaped rectangle. The area was excavated by a rear-acting mechanical excavator operating under close archaeological supervision. No archaeological finds, features or deposits were encountered.