Foghorn, Eilean Glas Lighthouse, Scalpay

Eilean Glas Lighthouse on Scalpay features two circular lighthouse towers, with the main tower designed by Robert Stevenson around 1825, replacing the original tower built in 1789. The adjoining 1789 house was converted into a store, likely around the same time as the main tower's construction. The site is enclosed by a high wall and includes two parallel detached ranges of single-storey keeper's cottages to the north, probably designed by Alan Stevenson around 1845. There is also a jetty to the northwest, outbuildings, and a foghorn located to the south at Rudh' an Eorna. Most buildings are whitewashed.

The original lighthouse may have been lowered in height, and its lantern was replaced with a shallow-pitched roof around 1825. The main lighthouse is a five-stage tower with bands between the stages, painted red and white. It features small oculi in the narrow top band beneath a cantilevered platform with lattice guard rails, and the lantern has diamond glazing topped with a domed cap.

The store was originally two storeys but was converted, likely by Alan Stevenson in 1845, into single-storey keeper's cottages. It is built of rubble with long and short dressings around the doors and windows, featuring a simple parapet and flat roof, along with tall stacks.

The keeper's cottages to the northeast now consist of two cottages (originally three) designed in a Graeco-Egyptian style. They are constructed from squared whin rubble with granite dressings, showcasing bold ramped doorpieces with cavetto cornices and stepped blocking courses. The outer bays have similar detailing but include windows, with one later door. The cottages have sash and case windows with an 8-pane glazing pattern, a main cornice, and a blocking course. The tall battered stacks have splayed cornices, with four central stacks grouped together and the outer two paired. The range to the northwest features eight bays, including the principal house and an old engine room.