Argoed Mill Gallery

Argoed Mill Gallery, Mill Cottage and Old Post Office form an asymmetrical group, with the mill at the north end, Mill Cottage in the centre, and the Old Post Office at the south end.

The two-and-a-half storey mill is constructed of rubble stone with dressed stone detailing and a slate roof. Arched openings are accentuated by prominent keystones. The central entrance now has a replacement door beneath a stone lintel. A replacement segmental-headed window is to the left of the entrance, and a wide arch provides access to a through passage on the right. The upper storey features central boarded doors with glazed panels, and three-light windows to the right and left. A blocked loft opening is visible in the right gable end, above the roofline of Mill Cottage. The left gable end contains the wheel chamber, which has been altered with an added roof and doorway for conversion to electricity generation.

The rear elevation has a wide passage archway on the left, with two blocked doorways to the right. A three-light segmental-headed window is located on the left side of the upper storey. A lean-to structure with a segmental, tooled lintel and corrugated iron roof abuts a stone wall, which historically supported the head race. Adjacent to the lean-to, also built against the head race wall, is a corner brick fireplace belonging to a range that has now been removed. The head race wall itself is distinguished by a round arch constructed with freestone voussoirs and a keystone inscribed with the date 1848.

Mill Cottage, set back from the mill, is a two-storey, two-window cottage built of rubble stone with dressed stone details, a slate roof, and a brick stack on the rear slope. Openings have segmental heads with keystones. The central, boarded front door has a glazed panel and a two-pane overlight. To the right and left are three-light windows, the one on the right being shorter. The upper storey has two-light, small-pane windows. The rear has added lean-tos on both the right and left sides. The upper storey of the rear elevation includes a two-light small-pane casement window on the left, and similar, but single-light, windows in the centre and to the right. The right gable end, visible behind the mill, is constructed of brick.

The Old Post Office stands at a right angle to Mill Cottage and is wider. It is a two-storey, three-window house of rubble stone with dressed flat arches and keystones, larger dressed quoins, a slate roof with projecting eaves, a stone stack on the right, and a roughcast stack on the left. The symmetrical, south-facing front has a central entrance with a boarded door incorporating a glazed panel, flanked by two-light casement windows. A George V letter box is positioned beneath the left-hand window. The upper storey has replacement windows in original openings. The left gable end is slate-hung and contains a pair of two-light, small-pane casements with segmental heads in the upper storey. The right gable end has a small window towards the lower left, a two-light upper-storey casement window, and an added lean-to on the right.

The mill machinery has been removed, and most floors have been replaced. However, the substantial, corbelled beams that originally supported the floors have been preserved. The loft retains a pulley block and queen-post trusses, some of which are inscribed with 'SGT/JD 1878'.