Work continued during 1841–42, a crane being used to hoist the huge blocks as the tower rose. The last one was raised to the parapet in July 1842. Robert Stevenson, then aged 70, visited the site on his last annual voyage of inspection. The walls at the base are thick, and thick at the top. The lightroom and lantern sit above nine apartments in diameter. The total cost of the works undertaken by the Northern Lighthouse Board was £86,977, including the cost of establishing the shore station at Hynish, estimated at £13,000. It is a credit to Stevenson, his foreman Charles Stewart, and Captain Macurich the landing master, that not a single life was lost during the construction.