Lower (West) Lighthouse with attached keeper's houses, walls and ancillary buildings

The Lower (West) Lighthouse, along with its attached keeper's houses, walls, and ancillary buildings, is a notable structure. The lighthouse features a tapering circular tower made of tooled ashlar, standing 20.42 meters high. It has a moulded cornice above the ground floor and a cornice with a cast-iron rail at the top. The tower has rectangular splayed window openings on each of its three upper stages, and the transomed windows of the upper storey include top lights that are splayed back.

A low corridor connects the tower to the original keeper's cottage, which is constructed of painted rusticated stonework and has a hipped slate roof with a central chimney topped with a moulded cap. The cottage features a two-window range facing south, with 6 over 6 pane sash windows that have been renewed in their original openings. There are blind windows on the return elevation to the east and a long rear wing.

A short section of garden wall connects this cottage to a later second dwelling, which has lined-out render over rubble instead of ashlar. This dwelling has a symmetrical south-facing elevation with a central doorway beneath an entablature hood and flanking 6 over 6 pane sash windows, along with similar detailing in its offset rear wing. The two dwellings are enclosed at the rear and to the east by rendered rubble walls topped with rough boulder copings. Between the two cottages, against the northern wall, is a wash-house dating from around 1860.

While the interior was not available for resurvey, previously recorded details are likely unchanged. The interior features a cantilevered stone staircase with a cast-iron rail that winds against the inner wall. The lower floors have stone slab ceilings, and the lantern storey has a cast-iron framework. The lighthouse also includes a cellar that was once used as an oil store.