The core of the building is a 16th-century hall and two storey solar block, built of stone rubble with freestone dressings.[2] There are gabled stone slate roofs.[2] The hall is open to the hammer beam roof.[2] The lower room of the solar has 16th century panelling, the upper room has a 17th century panelling.[2] A wing to the east was added around 1700.[1]
In the 19th century, further additions were made to the building by William Nesfield,[1] and John Douglas, who designed a new west wing for Augusta, Lady Mostyn in 1889.[3]
The hall now forms part of St David's College, a mixed sex independent boarding and day school for pupils aged 9–19.[1] Tennis player Angela Buxton attended school at Gloddaeth Hall.