Gilbertfield Castle is within the former barony of Drumsagard, which was a possession of the Hamiltons. The castle was built in the early 17th century, and the date 1607 is displayed on a heraldic panel above the door. The castle was later lived in, around the turn of the 18th century, by William Hamilton of Gilbertfield (1665-1751), a retired soldier and writer.
Gilbertfield is a well-planned L-plan tower house. The stair tower, which projects to the north, was large enough to accommodate a series of rooms as well as a square turnpike stair.
The basement level was vaulted, and contained cellars and a kitchen, which had a large fireplace and oven. A service stair connected the basement with the hall above. The hall itself had a smaller fireplace, as well as large windows with gunloops in between. Above the hall were two further floors, each with three rooms; two in the main block, and one in the wing. At the highest level, the garret, two round turrets projected at the south-east and north-west corners. There was no parapet.
The castle is now a neglected ruin, the east wall having collapsed in the 1950s. Only the corbelling of the north-west turret remains.which fell down in the late 1960s. It is now deemed extremely dangerous as a lot of the brick work has fallen each year. The turret fell in the 1970s.
References:The Broch of Clickimin is a large and well preserved, though somewhat restored broch near Lerwick. Originally built on an island in Clickimin Loch (now increased in size by silting and drainage), it was approached by a stone causeway. The water-level in the loch was reduced in 1874, leaving the broch high and dry. The broch is situated within a walled enclosure and, unusually for brochs, features a large 'blockhouse' between the opening in the enclosure and the broch itself. Another unusual feature is a stone slab featuring sculptured footprints, located in the causeway which approached the site. Situated across the loch is the Clickimin Leisure Centre.