Hafod Elfyn (former Natural Environment Research Council Offices)

Office in vernacular revival style. Single storey 'L'-shaped plan with additional accommodation in the roof, main range parallel to and offset back from Penrhos Road. Roughcast walls, tall slate roof laid in diminishing courses with small hips, ridge finial and axial chimney to main range. Dormer windows to the rear roof slope. Metal casement windows to the ground floor and small pane sash windows to the attic floor in each gable. Main entrance is in the long elevation facing the road and is offset to the right, plain timber plank doors set within a deep pink sandstone moulded surround.

Not inspected but said to survive largely intact with original doors and brass fittings, including the main entrance doors and corridor doors with bevelled glass panels. A plaque is reportedly located inside the entrance which reads: 'This research building is named Hafod Elfyn in honour of Professor R. Elfyn Hughes for his contribution to nature conservation and research in Wales'.