Blast Engine House at former Gadly's Ironworks

The Blast Engine House at the former Gadly's Ironworks is a distinctive tall and narrow building that stands three storeys high with a part-basement. It features snecked rubble facings, bull-nosed quoins, yellow brick dressings, and stone sills. The roof is modern and slated, with wide eaves. The front of the building is four windows wide, with cambered heads and long and short quoins in pale brickwork, including some large blocks. The windows are modern small-pane sash and case, similar to the original design.

At the ground floor center, built-up brickwork quoins sit above a later external stair that leads to a red brick platform on the left side of the front. The side elevations have one window each, with a boarded door at the left end and a tall arched opening through two storeys at the right end, which has modern glazed infill and a proposed canopy.

The rear elevation has similar detailing and is linked to adjacent masonry revetment by a rubble wall at the west end. It is accessed by a modern high-level metal bridge through a brickwork opening at the center. The rear features bull-nosed quoins and yellow-brick voussoirs above three stepped arches that are blocked at the basement level, facing a massive revetment wall. This revetment forms three sides of a rectangle and connects to the corner of the main furnace bank located to the north of the engine house.

The interiors were modernized in 1989 but retain the original floor levels and substantial fabric of the massive transverse beam wall, which originally supported the beam for the blowing engine.