Borthwick Castle, Scottish Borders was a 16th-century L-plan tower house, about north west of Duns, Scottish Borders, Scotland.[1]
The property belonged to the Cockburns. It was destroyed by quarrying,[1] having become ruinous, after 1970, although it had been excavated before demolition. Near the site stands a commemorative stone.[1] It is thought that it was a watchtower and small residence, rather than a place of strength.
Borthwick Castle had a courtyard surrounding the 16th-century buildings and a later house. There was a corbelled-out stair-tower in the re-entrant angle of the L-plan tower. The vaulted basement had a scale-and-platt staircase to the first floor.[1] The tower’s dimension were about by, with walls . Apart from narrow brick in the fireplace and window openings the building was constructed from mortared stone.