The broch stands on the top of a rock platform and is about 3 metres high at its tallest point.

This broch has a massive triangular lintel stone over the entrance, which is partly filled with rubble.

Drawings by Low in 1774 and Skene in 1805 reveal that the structure survived very well up to those dates.

[2] Culswick Broch was better preserved in 1774 when George Low's drawing shows three complete intramural galleries preserved on top of the buried lower storey as well as a scarcement ledge on the inside face.

[2] Media related to Broch of Culswick at Wikimedia Commons