Situated against or incorporated into the linear bank (NPRN 309339) crossing the island and 32m to the south-west of a prehistoric settlement enclosure (NPRN 309340) are the remains of a possible roundhouse. This survives as a circular platform around 5m in diameter with a mound at its centre.

This feature was surveyed by P. Brewers in 1992 and was revisited by the Royal Commission in 2013. The island has been documented during RCAHMW aerial reconnaissance.

Louise Barker, RCAHMW, June 2015

Sources
Brewers P., 1993 Cardigan Island: A survey. Unpublished B. A. Dissertation submitted to the Department of Archaeology, St David's University College, Lampeter.
Brewers P., 1994 Cardigan Island, Y Ferwig (SN 161 515). Archaeology in Wales 34, 3-6