Just west of the fortlet at Wilderness Plantation is the site of an ‘enclosure’.
The enclosure is visible in aerial photographs, but no traces are visible on the ground. The enclosure was rectangular in shape with rounded corners and was attached to the south side of the rampart. It is not clear what the it was used for.
The site of the enclosure lies around 230m west of the fortlet at Wilderness Plantation, north of Balmuildy Road and west of the Cawder Golf Club to the north-west of Bishopbriggs.