Kielder Castle

Kielder Castle is a shooting box built in 1775 by William Newton for the Duke of Northumberland, based on the Duke's own design. It has been altered in the mid-19th century by the Alnwick Castle estate office and again in 1926. The building is constructed of ashlar stone with a Welsh slate roof. The earlier sections are in a Gothick style, while the 19th-century additions are in a Tudor style.

The castle is designed as a courtyard house, featuring a mid-19th century irregular south front. On the left, there is a large castellated three-storey section with a canted oriel window and several paired lancet windows. Projecting from this is a 1926 extension in Gothick style. To the right, a recessed L-plan section displays 18th-century masonry, a plinth, and a string course, but includes 19th-century details such as a round-headed doorway and two-light mullioned windows, topped with a gabled roof featuring kneelers.

The right return has five bays, while the left has two bays in Tudor style. The right three bays contain 6-pane sash windows under hoodmoulds on the ground floor and 9-pane sashes with Tudor-arched heads and intersecting glazing bars on the first floor. The left return features similar details but with irregular openings.

At the rear, there are five bays with a central tall round-headed carriage arch under a gable, flanked by two-bay, single-storey linking ranges and two-storey, cross-gabled end bays with Gothick windows. The centre and end bays were formerly castellated.

Inside, the castle features two staircases with stick balusters, several six-panel doors, and internal shutters. Records from the diary of Charles Richardson and payments to William Newton confirm him as the architect.