Bron Eifion was built as a house in 1883-5 by John E Greaves, millionaire owner of the Llechwedd slate quarries at Blaenau Ffestiniog and developer of Porthmadog as a slate distribution centre, including the laying down of the Ffestiniog Railway. It was apparently designed by himself and his wife, and was first occupied in 1885.

The building, which is in a simplified domestic Gothic style externally, is constructed with dark coloured snecked rock-faced greywacke from Snowdonia, margin dressed to the openings and lintels, and slate roofs. It has two storeys and attics. There is a continuous lean-to verandah over the raised ground floor. On the right, a modern single storey with attic section is set back, with a very large bay window to the principal dining room. Above the entrance, and above the recessed section the first floor has narrow plate glass sash windows, a parapet and, behind, the glazed clerestory of the central great hall, with its own hipped roof. To the rear are extensive service buildings, many timber framed and gabled to provide a picturesque outline, including two framed gables on the main block. It is now a Country House Hotel.

Associated with gardens: Nprn: 86297

Reference: Cadw listed buildings database.
RCAHMW, 2010.