Custodian's House, Well Hut

The Custodian's House is a single-storey, small square plan house built on a levelled terrace by the Office of Works between 1924 and 1926 to serve as accommodation for the monument custodian. The house features snecked and stugged stone rubble walls with plain ashlar quoins and a piended, swept grey slate roof with overhanging eaves. The window openings vary in size and are asymmetrically arranged, fitted with timber, multi-pane sash and case windows and raised stone cills.

The front elevation, facing southeast, is asymmetrical, with a recessed porch on the right side supported by a rectangular-plan corner pillar. On the left side, there are bipartite six over six pane windows. The door is located in the re-entrant angle of the porch, and a bronze cast bell inscribed with "A.M. 1940" hangs from the corbel of the corner pillar. The house also has two tall and robust wallhead chimney stacks.

The interior, observed in 2016, has a plain design with a largely intact early 1920s layout, which includes two bedrooms and a sitting room.

To the northeast of the house, there is a small square-plan stone hut with a piended slate roof, which was partially built into the stone rubble wall in 1926 by the Office of Works as a shelter for an existing draw well. The wall and below-ground elements of the well are part of the scheduled monument 'Inchcolm, Abbey, Hermit's Cell, First World War and Second World War defences (SM90166).