Penhein is a large two storeyed villa of a standard Regency type with added Italianate features of 1876. There are two small service wings; an octagonal tower of 1876 added onto the south east corner, and a two storey porch in the centre, also added in 1876. The porch has a plain door and narrow windows in either side wall. Deep eaves on paired brackets go right round the building.
