Chapel

The chapel is located at the south-western end of the Avenue, and was begun in July 1760 to a design derived from Palladio by James Paine; an earlier, unrealised, circular design had been commissioned in 1737 from either Sir Thomas Robinson or Daniel Garrett. Sir George Bowes died in September 1760; the shell of the building was completed in 1769 under the supervision of his widow, Mary Gilbert, but the interior work was not completed and the chapel consecrated until 1812, under his grandson, John Bowes, 10th Earl of Strathmore and Kinghorne. Bowes was then buried in the mausoleum beneath the building.^[11][12]

The building was designed in the Palladian style and takes the form of a Greek cross within a square, with a dome on a drum over the crossing. The north-east facade, which faces the Avenue, is the most highly-decorated part of the building. It consists of a double portico, the inner order consisting of six unfluted Ionic columns and the outer of four, carrying the pediment. The two outer columns on each side of the inner portico are engaged, the gaps between them being filled by arched openings. The whole facade is topped by six urns. The other three elevations are plainer, and feature Diocletian windows in the end elevations of the cross arms.^[11][12]

Internally, the arms of the cross are apsed, with groin vaulting, and the crossing and corners are domed. The entablature and arches are richly decorated, as intended by Paine, but the rest of his decorative scheme, which would have included coffering in the apses and dome and statues in the niches of the apses, was not carried out. Nevertheless, the nineteenth-century furnishings, all made of cherrywood are of high quality and complete. They consist of a holy table surrounded by rails; a triple-decker pulpit, the sounding board supported by a single Ionic column; and box pews in the corners and side apses, the latter curved to fit the space. The Bowes-Lyons used a box pew in the corner which had underfloor heating.^[11][12]

There is a house for the minister nearby. Some holders of the position would not have been able to hold a Church of England parish living, on account of their views.^[13]

Orangery

The orangery was built between 1772 and 1774 for Mary Eleanor Bowes, who had a keen interest in botany, to a design by William Newton. The building has a seven-bay arcade of Tuscan columns to the front and plain three-bay arcades to each side, the rear arch on each side filled with a pedimented doorway, which lead into lobbies. The rear contains five sash windows, the middle three forming a canted bay with views across the Derwent valley. The building, which originally had a slate roof, was converted into a conservatory by John Bowes in 1885 by the addition of an glazed iron roof; at the same time a brick podium was constructed in the centre of the main room to display plants and a heating system added, with a boiler installed in the western lobby. The roof was removed between the First and Second World Wars, since when the orangery has been a roofless shell, however the fabric was consolidated by the National Trust in 2005.^[11][12]

Stables

The stables were built between 1746 and 1751. The design was probably by Daniel Garrett, and is similar to his Fenham Hall in Newcastle-upon-Tyne. The building forms a quadrangle around a couryard, with the main entrance in the south wing and an exit in the west wing, thus enabling carriages to pass through without needing to turn. The east wing, which contained the visitor entrance and which faced the new coach drive created for Sir George, is decorated in the Palladian style. The centre projects in a five-bay block, with a pediment over the central three bays. The door occupies the centre bay of the ground floor, and is flanked by niches and set within a three-bay blind arcade, and there are two aedicules in the outer bays. The first floor has five sash windows. Inside, some plasterwork and the stalls of the show stable survive, the latter separated by narrow wooden classical columns.^[11][12]

Banqueting House

The Banqueting House was built in 1746, and is an early example of Gothic Revival architecture, of the early form often called "Gothick". It has now been restored and is available for letting by the Landmark Trust, who now own it.^[14]

Column to Liberty

The Column to Liberty was built between 1750 and 1759 to a design by Garrett, but completed by Paine after the former's death in 1753. It consists of a pedestal bearing a Roman Doric column, which at 42.7 m (140 ft) was, when constructed, the second-tallest column monument in England after the Monument to the Great Fire of London. The column is topped by a statue of a woman, personifying Liberty and originally gilded, who holds the Staff of Maintenance and Cap of Liberty. It represents George Bowes' support for the Whig Party.^[11][12]