A long two-storey range constructed of rubble stone with slate roofs and a lean-to at the northern end formerly stood perpendicular to Berth-ddu farmhouse. It had a number of square-headed second-storey windows and doors at eaves level, while the first-storey openings had brick lintels. There were two large vehicular entrances towards the northern end of the building. The outbuilding was photographed in 1953 as part of the National Building Record but has since been demolished.

(Sources: NBR Photograph 6-767 by G. M. Mason (1953))
A.N. Coward, RCAHMW, 24.05.2019