We took the professional lead in the conservation of Brizlee Tower, a Gothick folly tower designed by Robert Adam in 1777 for the First Duke of Northumberland. Standing on a rocky hilltop in north Northumberland, the tower had severe problems of water penetration and rusting ironwork which left the slender stone balustrades unsafe and the building had to be closed. After carrying out archival research and a condition report, we coordinated a wide range of specialist investigations and research to inform our detailed conservation proposals, and led the English Heritage grant aided project to repair and conserve the tower. The works included rebuilding the arcades with a new Prince of Wales Order column capital; reconstructing the balustrades at both levels with hidden reinforcement; waterproofing the balcony; forming rodding access to the built-in lead rainwater pipes; restoring windows and the design of new Gothick style windows for the caphouse; adding handrails and a lightning conductor; stone cleaning and full repointing. Visitors can once again enjoy both the building and the superb viewpoint it provides of the designed landscape of Hulne Park and North Northumberland.