Gates And Boundary Walls, Gatepiers, Tillycorthie Mansion House Including Walled Garden, Udny

The mansion house at Tillycorthie, along with its walled garden, gates, and boundary walls, was built between 1911 and 1912 for a Bolivian tin magnate, designed as a "Spanish Villa." James Scott and Company of Aberdeen were the contractors, with some interior details reclaimed from Dunecht and dating back to 1900, designed by George Bennet Mitchell. Restoration work has continued into the 21st century.

This unusual early concrete building is two stories high with a basement and is arranged in a U-plan around an enclosed courtyard, creating a rectangular overall shape. It displays a sub-baronial style, featuring narrow crenellated towers, slim conical-roofed bartizans, crowstepped gables, and fine interior detail. The Hennebique concrete structure was lime harled in 2006, with openings now margined. Architectural features include band courses, corniced window heads, and mutuled crenelations to the centre tower. The windows are concrete mullioned, with bipartite and tripartite sections, and feature a hoodmould with label stops.

The principal elevation, facing southwest, is symmetrical and includes a three-stage centre tower with two small windows on the ground floor, a dated tripartite stair window under a stepped hoodmould, and a corbelled canted window on the first floor. Recessed bays, fronting the courtyard, have full-width, part-glazed sliding timber screen doors and concrete piers at ground level; the first floor features three windows in the screen wall. The courtyard is covered by a pitched glazed roof. Outer gables have corniced square-plan bays rising through the ground and first floors, and bartizaned angles. A full-width conservatory projects from the ground floor on the right side. A further, taller, square tower is located at the rear.

The windows throughout are timber sash and case with plate glass glazing, although some have been replaced. The roof is covered with grey slates, including a fishscale pattern, and features decorative cast iron cockerel weathervanes on the conical roofs. Concrete stacks are banded and coped, with clay cans, and the building has cast-iron downpipes with decorative rainwater hoppers.

Inside, much original detail has been retained or reinstated. This includes decorative plasterwork, timber panelling, and oak doors. A "Christmas Room," formerly the drawing room, is decorated with painted wall and ceiling panels in a Neo-Adam style. The billiard room retains its original carved timber chimneypiece, although some carved figures have been removed.

The walled garden and terrace are located to the southwest of the house. The walls are constructed of coped rubble, with terraced walls of large squared rubble blocks, snecked and flat-coped.

The gatepiers, gates, and boundary walls are rock faced, with pyramidally-coped, square-section gatepiers, decorative ironwork pedestrian and vehicular gates, and flat-coped snecked rubble quadrant and boundary walls.