The excavation of the Clickhimin site in the Shetland Islands by the Ministry of Public Building and Works revealed the arrangement of living quarters inside a small stonebuilt fort occupied between the 4th and 1st centuries BC [I]. With the exception of a large communal stonebuilt hut in the centre of the enclosure, the inhabitants dwelt in a series of half-timbered storeyed ranges attached to the inner face of the fort wall (FIG. I). The pent-roofs of these ranges were supported by a dwarf, or casement, wall built on the wall walk, and access between the rooms at first-floor level and the walk was obtained through a series of doorways. Two stonebuilt duns in the Western Isles, Dun Ringill and Dun Grugaig, still retain the jambs of such doorways and at Clickhimin a similar door was preserved in the blockhouse guarding the fort entrance though here it led to a passage which gave access to a stair to the parapet walk at second-floor level [2].
