St Dunstan's Lock

St Dunstan's Lock is a house that has been converted into a cafe. It dates from the late 18th century and has undergone some alterations in the mid-20th century. The building is constructed of brick, roughcast, and whitewashed materials, topped with slate and asbestos sheet roofs, and features two side wall stacks. The east side has a chamfered plinth and coped gables.

The south front includes a full-width recessed shopfront from the 20th century, with two upper floors that each contain three plain sash windows with lintels and multiple keystones. Above these, there are traces of a central half-round window. The east side, facing The Strait, features a late 20th-century shopfront. The west side, which faces St Martin's Street, has a hipped rear wing with four recessed panels, two of which contain 19th-century segment-headed windows. The name of the building is derived from a corruption of Dernestall Lock.