Dock, perimeter wall and attached buildings to east of Fort Belan

The dock, perimeter wall, and attached buildings to the east of Fort Belan were built as a tidal dock. The dock is connected to Fort Belan by the fort's curtain wall, which runs eastwards to join the dock’s perimeter wall. The complex includes a dock offset to the north, a broad quay to the south, and single-storey domestic and service ranges built of rubblestone with Glynllifon estate red brick dressings and Dinorwic slate roofs against the wall on all three sides.

The narrow dock has battered stone walls with concreted copings and projecting stone steps at the west end. Dockside stores No. 8 and No. 4 are located on the north side. Store No. 8 is a 7-bay building with a half-hipped roof, distinctive cast-iron small-pane lunette windows, and a camber-headed doorway with recessed boarded doors. Store No. 4 is linked to the curtain wall and is gable-ended with slit ventilators, and a modern seaward extension. A windlass is located at the mouth of the dock near the slipway, and a 3-bay hipped-roof stone boathouse stands at the east end, with segmental arches; the centre and right have doors, and the left is infilled with a 6-pane window.

The south range includes a forge, then paint stores, and Dock Cottage towards the centre. These buildings have red brick chimney stacks with toothed cornices, boarded doors, and square-headed windows - small-pane pivot-hung to the forge and paint stores and 4-pane sashes to Dock Cottage. Dockside stores No. 3 is at the west end and features six small-pane lunette windows. The Boys' Quarters are at the shorter east end, with a half-hipped roof, similar brick chimney stacks, a symmetrical front with iron-framed diamond-paned windows to the centre, boarded doors beyond, and 16-pane windows to the extreme ends; all windows have red brick jambs. A chain furnace, claimed to be the only remaining example worldwide, stands in the corner, now roofless but retaining the circular brick chimney and slit openings. A slate lintel covers the furnace and a tar tank is located behind it.

The forge retains its furnace and flagged floors.