Marquess of Bute's Warehouse

The Marquess of Bute's Warehouse is a three-storey building with a basement, featuring a three-bay layout and constructed with coursed hammer-dressed stone. It has a low pyramidal slate roof that is topped with an ashlar blocking course and a heavy cornice, along with a small chimney stack. The central loading bay extends the full height of the building and includes boarded and corrugated shutters at three levels, with brackets for pulley hoists above. The flanking windows have cambered heads and originally held 20-pane ironwork frames, which are now blocked. The northern front mirrors this design and has boarded doors, along with a notable ironwork bracket crane with a pulley and a small enclosed yard.

The warehouse retains its original construction, featuring a three-aisled ground floor above a fireproof basement. The ground floor is supported by cast-iron piers that are fish-bellied and crossed-flanged, with annulets and curved cross-plate ends. The piers are embossed with the lettering "W. Catleugh. Millright, Cardiff." A cast iron handrail leads down the corner stairs to the basement, which has brick Jack Arches and inverted T-profile girders supported by longitudinal girders and the same piers. The floor is stone flagged, while the upper floors are timber, topped by a pyramidal timber roof supported by a king post construction in the center. The upper floors have brick linings only.