Behind and below the West Quay Wall is the Bonded Warehouse. These were probably built for the Duke of Chandos in 1723 by John Payne, his agent in Bridgwater. Payne was charged by the Duke to build a warehouse, with one covering arch and five houses in what is now Castle Street. Due to mismanagement Payne was eventually dismissed and replaced by Benjamin Holloway, the builder of the Lions.[1]
It has been suggested that the Bonded warehouse may ghost the line of the medieval undercrofts: the back wall is medieval and of a substantial thickness. The castle wall facing West Quay has been tunnelled out in three places from the warehouse, to create two small vaults and a passage through the wall. [2]
[1] Baker and Baker The Life and Circumstances of James Brydges, First Duke of Chandos (London, 1949) pp.222-223
[2] Sidaway, C., ‘Bridgwater Castle, West Quay’ in the Proceedings of the Somerset Archaeological and Natural History Society (Vol.135 1991) p.169