Baldon House Baldon House East Wing Baldon House West Wing

Baldon House comprises a manor house with an irregular U-plan, dating back to the 17th century, with probable elements from the 16th century, and subsequent alterations in the early 18th century, late 18th century, and the 19th and early 20th centuries. The building is constructed of rendered walls with limestone dressings and brick, topped with old plain-tile roofs and brick stacks.

The front of the house features a 4-gabled design, with advanced outer bays and a 2-storey gabled porch in the centre, the archway framed by a Classical keystone within a rectangular surround. Each gable is topped with stone copings and obelisk finials. Windows predominantly consist of narrow paired sashes; one tripartite sash is located to the left of the centre. Original windows retain 17th-century stone labels. Dormers have been added to the roof in the 19th century.

Side wings feature sashes, and the right wing incorporates a 19th-century bell turret and clock. A 2-story rear range belonging to the main block, added in the late 18th century, showcases central tripartite sashes placed beneath recessed arched tympana, flanked by large canted 2-story bay windows with shuttered sashes on each face. The brickwork of this range was previously stuccoed. A brick subsidiary wing projecting to the right of the main block has a partly-crenellated garden front, including a canted 2-story section containing an orangery on the ground floor and featuring five Gothick windows on the first floor. Attached at the extreme right end is a 2-story stone Gothick tower. This tower incorporates a fine 15th-century doorhead—a 4-centred arch within a deep rectangular casement moulding featuring quatrefoils in the spandrels—which was recovered from the demolished medieval church at Nuneham Courtenay.

Inside, the dining room is characterized by early 18th-century mahogany fielded panelling with fluted Doric columns flanking the fireplace and supporting an entablature with a triglyph frieze. The marble fireplace bearing the Willoughby crest is likely late 18th century. The entrance hall is distinguished by Doric columns flanking steps leading to a late 18th-century stair hall, which includes a cantilevered stair with a cast-iron balustrade and a ramped and wreathed mahogany handrail. A double bow-ended room exhibits a triglyph frieze with ox heads, a contemporary marble fireplace, double-leaf mahogany entrance doors and curved doors at the rear. A second drawing room encompasses a canted bay window and a 18th-century fireplace with an eared architrave. The original 18th-century fireplace has been removed to Woodperry House. The two rooms and stair hall are decorated with ornamental wood-block floors, and the overall decorative style is reminiscent of that of Sir John Soane. The eastern bay of the main range preserves a 17th-century beam with triple-ovolo mouldings and a recessed soffit, along with 17th-century oak panelling and two stone fireplaces with 4-centred arches, possibly dating back to the 16th century. A chamfered 4-centre arched stone doorway may also be from the 16th century. The western extension of the main range includes a mid-18th-century pine-panelled room.