Glamorganshire Canal (nprn 34425) building, to the west of Lock yr Odyn, possibly originally used in connection with the limekiln immediately to the north and latterly possibly a lengthsman's maintenance shed. It is a single storey building with rubble walls under a pitched roof, extended at the south end, doubling its size, between 1877 and 1900. Currently (June 1979) in use as a church (St Gwynno's), boasting a small wooden belfry on the south gable.
Site visited B.A.Malaws, RCAHMW, June 1979.