Steam Mill Public House and Offices

The Steam Mill Public House and Offices is a warehouse, rebuilt in 1834 after a fire, with alterations in the 19th century and 20th century. It is constructed of English bond brick with stone sills, topped with a Welsh slate roof. The building occupies a rectangular site and is a complex arrangement of storage structures, culminating in a substantial central silo. The silo has Romanesque detailing with blind north and south facades banded with Lombard banding. A prominent eastern tower features "STEAM MILL" (formerly "MILNS SEEDS") painted above recessed pilastered brickwork.

The Canal Side elevation has a central, five-bay, five-storey gable block with a five-light round-headed apex window. The ground floor has entrances in bays 1 and 4, with bays 1 and 2 altered and bays 3-5 featuring a giant order of 12-pane windows in recessed round-headed surfaces, divided by pilasters and a continuous horizontal brick course at the 3rd and 4th storeys. A loading bay is located on the first floor of the 3rd bay. Attached to the east is a later, five-bay, five-storey gable end with blocked loading bays and a fifth floor with fenestration within recessed, round-headed brickwork above a continuous string course. A 12-bay, 6-storey return runs along Steam Mill Street. A blocked chapel street facade extends to the third storey. The Canal Side and Chapel Street elevations share a central gable with a five-light round-headed apex window, along with a later western gable with a four-light apex window. The pilasters on both elevations terminate in plain, stone, stop-chamfered strips above a course of brick billet.

The Savill Street elevation displays a four-bay return of the central gable, with lower stories obscured by a 20th-century addition. At right angles to the street line, a three-bay, three-storey late 19th-century addition is joined to a two-storey rectangular building with a hipped roof and decorative brickwork frieze. The Savill Street facade has an entrance in the 2nd bay, while the Canal Side elevation has a central first-floor loading bay. All first-floor windows are 3-light, 30-paned, round-headed windows with stone sills, beneath round brick relieving arches linked by a continuous band of decorative dentil brickwork.

The interior was formerly notable for a blown-air seed-transport system for upward movement and a gravity system for downward movement; these systems were removed during conversion to offices. Photographic records of the original equipment are held by the Royal Commission on Historical Monuments and Access to Historic Collections of Wales. The interior has not been inspected for this listing.