Block C: former salvage store and pattern-maker’s workshop and boundary wall, Underfall Yard

Block C is a former salvage store and pattern-maker’s workshop built in 1906. It features red Cattybrook brick laid in Flemish bond and has a slate roof. The building is rectangular and forms part of the boundary of Underfall Yard at the junction of Cumberland Road and Avon Crescent.

This two-storey structure has seven bays and faces roughly north. The ground floor is open-sided, supported by cast iron columns and a riveted I-beam. The six left-hand bays have been infilled, with two pairs of timber doors and one pair of brick infill. On the first floor, the windows are set in segmental arched openings and have multiple lights in iron frames with top-opening casements. An external concrete stair provides access to the first floor. The building features a stepped brick cornice and a pitched roof with apex lights.

The road-facing elevation is blind on the ground floor and has a row of seven windows on the first floor. The east gable includes a doorway on the ground floor and two windows above, while the west gable partially abuts the terrace of Avon Crescent, which is also listed at Grade II.

Inside, the ground floor storage areas are lofty, with exposed painted brickwork and steel I-beams supporting the upper floors. The first floor, now converted to offices, is well-lit with ample glazing on three elevations and the roof, and features inserted lightweight partitioning. The roof structure includes bolted king post trusses and matchboarding above. The windows retain etched graffiti by former staff, including "G PERRY 1948" and "REES 1908."

Additionally, the boundary wall surrounding the yard is believed to date from the same period and extends eastward to Block A, the sluice house.