Kindlestown Castle is a late stone example of the hall house, commanding a good view of the countryside and the Irish Sea.

In 1301 the Uí Broin (O'Byrnes) burned down nearby Rathdown Castle; the occupants may have taken refuge at Kindlestown.

But John Fitzdermot had not the stomach for the fight with the Irish, conveying the manor of Rathdown about 1305 to Nigel le Brun, Escheator of Ireland.

Kindlestown Castle flourished during this time and we know from the Inquisitions of James I that in 1621 it was surrounded by 400 acres (160 ha) of land and had a water mill.

The surviving castle, two storeys high, is built of rough limestone, and the main features consist of a small projecting tower in the north-west corner, an original barrel vault at ground-floor level, and an entrance (at ground-floor level) and mural staircase in the eastern wall.