The house is mainly constructed from stone and lime mortar, except for the newest section (1897-1910) which was made out of early cast concrete.

On the hilltop beyond the gates is a small folly, known as Hunter's Monument, which terminates the axis, and was formerly used as a lookout by the lairds.

[3] Their son Robert Bell Hunter, 8th Laird of Lunna, sold the property in 1893 to John Bruce of Sumburgh.

Lieutenant David Howarth set up the SOE base at Lunna House, which accommodated the Shetland Bus boat crews.

The Shetland Bus operation moved to Scalloway in 1942, but the SOE base remained until the end of the war.

The beaches below the house were used for testing one-man submarines and other equipment, as part of the SOE activities.