The ruins of a substantial mansion in The Machars district of Dumfries and Galloway, Barnbarroch lies a mile (1.5km) north northwest of Whauphill and 3 miles (5 km) southwest of Wigtown. The home of the Vans Agnew family, it was built around 1771 following the marriage of John Vans of Barnbarroch to his cousin the heiress Margaret Agnew of Sheuchan, who restored the family fortune. Comprising two storeys and a basement, it was altered 1806-08 by John Claudius Loudon (1783 - 1843) but destroyed by a fire in 1941, killing Mrs Ada Vans Agnew as she slept. A roofless shell remains. This was not the first house on the site; the lands came to the Vans family in the 14th C. through marrying a Douglas. Sir Patrick Vans of Barnbarroch (d.1597) was a confidant of King James VI, and notably negotiated his marriage to Anne of Denmark.
Loudon was also responsible for laying out the surrounding parkland, planting trees and creating landscape features such as an ornamental pond (now drained) on The Canal in front of the house.
