4 Mill Street

Nos 1-4 Mill Street is a terrace of four estate cottages built in the third quarter of the 19th century, specifically for Lord Penrhyn after he acquired the estate in 1856. The cottages are one-and-a-half storeys high and constructed from rubble, featuring shallow-pointed slatestone lintels above the ground floor openings. They have a continuous slate roof with a tiled ridge and deep verges.

There are two chimneys, one shared between nos 1 and 2 and another between nos 3 and 4. These chimneys are two-stage, with a rendered lower section and a stone upper section, and they have plain cornice bands. The cottages are designed as one-window reflected pairs, with nos 1 and 4 having outer entrances, while nos 2 and 3, the central units, have inner entrances.

The doors are half-glazed and date from the 20th century, while the ground floor windows are 6-pane sashes with projecting cills from the 19th century. The upper windows are also 6-pane sashes, set within mid-20th century flat leaded dormers that break the eaves. At the rear, each unit features a modern door and window combination, along with paired modern dormer windows on the upper floor.