North Gate-Lodge, Blackadder House

North Gate-Lodge at Blackadder House was built in 1878 and features later additions and alterations. This single-storey building with an attic has a three-bay "cottage orne" design and serves as an ornamental lodge house, which includes a modern brick addition and a conservatory to the northeast. It is constructed from bull-faced sandstone with polished ashlar dressings, featuring a base course, long and short slightly advanced quoins, and ashlar mullioned and transomed windows with slender lancet lights and chamfered arrises.

On the southwest elevation, there is an advanced jerkin-headed bay at the center with a slightly advanced window that includes a cornice and cill course, flanked by additional windows. A bipartite window is present on the southeast return elevation, which breaks the eaves with a gabled dormer above. To the left, there is a timber boarded half-piended porch at the re-entrant northwest angle, featuring a traverse-boarded and studded door with wrought-iron fittings. The bay to the right is set back and blank.

The southeast elevation has a gable with a tripartite window, where the central light is taller. To the right, there is a red brick addition with concrete coping that includes a modern two-pane window. The northeast elevation features a modern glazed door at attic level, along with a modern brick addition that has a platformed roof and a modern conservatory. The northwest elevation displays a jerkin-headed gable with a tripartite window similar to that on the southeast.

Original glazing remains in all windows except for the central light of the southwest window and the modern addition. The ornamental complex slate roof includes bands of green fishscale slates, with jerkin-headed projections on the center, southwest, northeast, and northwest elevations. The central light of the tripartite window on the southwest has a swept steep half-piended roof topped with a spherical finial. There is a modern rooflight on the southeast return of the central projection. The ridge is adorned with cast-iron cresting, and the gables feature ornamental pierced bargeboarding with timber finials. The center has an ashlar coped stack with two barley-twist coped flues.

The interior was not seen during the last inspection in 1996. To the east, there is a boundary wall and pier made of squared and snecked stugged sandstone with rounded droved ashlar coping. A square-plan pier at the west end features pyramidal coping.