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Interior

The Palace of Westminster contains over 1,100 rooms, 100 staircases and 4.8 kilometres (3 mi) of passageways, which are spread over four floors. The ground floor is occupied by offices, dining rooms and bars; the first, or principal, floor houses the main rooms of the palace, including the debating chambers, the lobbies and the libraries. The top two floors are used as committee rooms and offices.

Some of the interiors were designed and painted by J. G. Crace, working in collaboration with Pugin and others. For example, Crace decorated and gilded the ceiling of the Chapel of St. Mary Undercroft.