Dall House was the main school building. It housed two of the boys’ boarding houses, the dining hall, kitchens, masters common room and headmasters office, and in later years the girls boarding house. The estate dates back to 1347. Dall House was built in 1855 as a principal seat of the
Clan Robertson, which it remained until the early last century. In 1860 it was sold to
Thomas Frederick Charles Vernon Wentworth of Yorkshire. It passed to his son Captain
Bruce Vernon-Wentworth, who used to visit during the
autumn shooting season. He took his staff from his main residence at
Wentworth Castle in Yorkshire during the season and after the end of World War II lived there full-time until his death in 1951. He is buried at a private grave site by the
burn adjacent to the house. The building is a romantically styled
Scots Baronial mansion house designed by architects
Thomas Mackenzie and
James Matthews. Prior to being purchased by the school, it was used as offices by the
Forestry Commission. ==Closure in 2002==