The estate lies between the villages of St Georges-super-Ely (to the northwest) and Downs (to the south) just inside the boundary of the Vale of Glamorgan.

[2][3] The earlier house had been built in 1767 and was owned by John Llewellin, who married Edmund Traherne of Castellau's sister.

The replacement building was said to be "in the style of Edward Haycock Snr, of Shrewsbury, who designed Clytha House, Monmouthshire".

[6] Sir Cennydd Traherne, born here on 14 December 1910, was a notable owner in the 20th century;[7] he was Lord Lieutenant of Glamorgan from 1952 to 1974.

It contains sash windows and "a central single-storey green sandstone portico with four unfluted Doric columns" at the main entrance.

[12] Secluded and quiet, the parkland is on rolling ground facing away from the trunk road and contains partially fenced pasture.

[3] The property is one of many sites used for the filming of the Doctor Who series, along with other programs such as Torchwood: Children of Earth, Sherlock and A Discovery of Witches.