This report sets out the results of an Archaeological Watching brief that was carried out during the excavation of the foundation for a new stair access to the rear of the former Lancaster Inn, 45-46 Sandside, Scarborough, North Yorkshire (TA 05118 88818). The ground-works had the potential to affect archaeological remains associated with the medieval and post-medieval town of Scarborough, and so the developer was required by Scarborough Borough Council, on the advice of the Heritage Environment Team at North Yorkshire County Council, to implement a Scheme of Archaeological Investigation and Recording at the site (Planning ref. 13/01199/FL). The area for the new staircase access raft had formerly been occupied by the gent's toilets for the Lancaster Inn. Following the demolition of the toilet block, a trench was dug by hand around the perimeter of the raft. The concrete floor of the toilet block was also removed by hand. No archaeological structures, features, deposits or finds were revealed during the ground-works, but a small number of 19th century sherds were observed.