In English architecture, mainly from the Tudor period onwards, a banqueting house is a separate pavilion-like building reached through the gardens from the main residence, whose use is purely for entertaining, especially eating. Or it may be on the roof, as in many 16th-century prodigy houses. It may be raised for additional air or a vista, with a simple kitchen below, as at Hampton Court Palace and Wrest Park, and it may be richly decorated, but it normally contains no bedrooms, and typically a single room apart from any service spaces. The design is often ornamental, if not downright fanciful, and some are also follies, as in Paxton's Tower. There are usually plenty of windows, as appreciating the view was a large part of their purpose. Often they are built on a slope, so that from the front only the door to the main room can be seen; the door to the servants' spaces underneath was hidden at the back (Wrest Park). The Banqueting House, Gibside is an example.
In the English of the period, "banquet" had two distinct meanings: firstly a grand formal celebratory meal (the usual modern sense), but also a course or light meal taken in a special place away from the main dining place, the relevant sense here (Whitehall apart). In large meals a banqueting house was most likely to be used for eating dessert, if reasonably close to the main house. Otherwise it might be used on fine days for taking tea, or any kind of drink, snack or meal.
Whitehall is a road in the City of Westminster, in central London, which forms the first part of the A3212 road from Trafalgar Square to Chelsea. It is the main thoroughfare running south from the site of the original Charing Cross at the southern end of Trafalgar Square towards Parliament Square. Recognised as the centre of Her Majesty's Government, the street is lined with government departments and ministries; the name "Whitehall" is thus also frequently used as a metonym for British central governmental administration, as well as being a geographic name for the surrounding area.
The name is taken from the vast Palace of Whitehall that occupied the area before its destruction by fire in 1698. Whitehall was originally a wide road that led to the front of the palace. Trafalgar Square was built at its northern extremity in the early 19th century. The southernmost portion between Parliament Square and Downing Street is named Parliament Street. Combined, Parliament Street and Whitehall cover a distance of about 0.6 mile (1 km).