Located 1.2 kilometres north-northeast of Bunowen church and graveyard, and a kilometre northwest of Bunown Mill, this two-storey structure measures approximately 10 metres north to south and 7.5 metres east to west. Though now heavily overgrown with vegetation and situated within an abandoned farmyard, the castle still displays impressive architectural features including well-crafted quoins, a pointed doorway (now blocked) in the southeast wall, and narrow slit windows with dressed stone jambs on the first floor.

The tower house forms part of a larger defensive complex, standing at the northeast corner of a substantial sub-triangular walled enclosure, with a well located 60 metres to the southeast. The castle’s historical significance is documented in the 1654-7 Down Survey map of Bunowen parish, where it appears as a tower house structure standing in the townlands of Bunowen, Tullimore Bogganboy and Aghacurra. The survey’s terrier noted that both a castle and mill stood on these lands, which in 1641 belonged to Pierce Dillon, an Irish Catholic, before being decreed to a Protestant in smaller parcels during the Cromwellian land settlements.

Today, access to Bunown Castle remains restricted, with the only entrance through a locked gateway, and the interior inaccessible due to the thick vegetation that blankets the structure. Despite its current state of abandonment, the castle stands as a tangible reminder of the complex land ownership changes and religious tensions that characterised 17th-century Ireland, when properties frequently changed hands between Catholic and Protestant owners during periods of political upheaval.