An early motte and bailey castle underlie the fabric of the mainly mid twelfth to early thirteenth centuries castle at Tretower.Replaced as a residence by nearby Tretower Court (NPRN 16305) from about 1300, it was still largely intact in the early sixteenth century.

The surviving remains are of rubble sandstone and consist of a circular tower and the remains of a shell keep. The three storey tower with basement dominates - it has an entrance on the northern side at first floor level. The fireplace on the northwestern side on the first floor has moulded and scalloped corbels whilst a similar fireplace on the second floor has fine slab seats. The remains of the gatehouse are to the east of the keep and the kitchen and first-floor hall are to its south. The the solar is to its west.
(Source CADW listed buildings description)

RCAHMW, December 2008.