The Lighthouse is built of ashlar limestone and is not plastered. It is painted in red and white bands on the outside. The Lighthouse tower is 30 m (98 ft) high and is unusual because it is square, not round. Unlike many other lighthouses, it has kept its original gallery railings, which are of iron and bellied (i.e. curved out in width at their crowns) towards the top. The present lantern, fitted in 1856, did not need the original railings to be taken down.