Welbourn Castle survives only in the form of earthworks. The Historic England listing states :-
"The ringwork is roughly D-shaped in plan and is enclosed by a bank and external ditch.
The central area measures approximately 60m in width and lies at about the same level as the surrounding ground.
The interior formerly accommodated the buildings referred to in a document of 1288, including a hall with two chambers, a kitchen, brewhouse, oxhouse, cowshed and sheep fold.
The document also indicates that there was a wall, surmounted by a tower, and a ditch around the court"
DB 26 March 2018