At ground level, an open arcade extends along the two street frontages, sheltering the entrance to the tube station, a row of shops on Bridge Street, and the main public entrance on Victoria Embankment.
Interior design The courtyard is covered by a glass roof at 2nd floor level and surrounded by a 2-storey cloister.
The upper level of the cloister serves the committee rooms and is accessible to the public via a glazed staircase projecting into the courtyard from the main entrance hall.
The floors above this cloister provide the necessary additional office space for almost one-third of all MPs. Two restaurants, a coffee shop and an e-Library open onto the courtyard itself, which, though clearly visible from the entrance hall, is mainly for the use of MPs and serves as the social focus for the whole parliamentary campus north of Bridge Street.
A secure underpass links the courtyard to the Palace of Westminster. Construction The building was designed in conjunction with the seven storey high underground chamber of the new tube station. The high-tech style of Portcullis House is also evident externally, where fourteen tall, bronze chimneys line its roof. Thirteen of these chimneys are used for natural ventilation, while the fourteenth is a flue for mechanical systems.
They are all positioned on the roof due to a lack of underground space, but by echoing the aesthetic of the chimneys of the adjacent Norman Shaw building and Palace of Westminster, they help the building relate to its setting. The chimneys are positioned on top of a series of box girders that double as air ducts and form a spider-like pattern on its roof. These box girders then rest on prestressed sandstone columns expressed on the building's facade.
Between the sandstone columns, the studio also developed prefabricated high-tech cladding, including ducting, windows, sun-shading and a "light shelf".
The atrium is complete with trees and water features, with a secure underpass that links the courtyard to the Houses of Parliament. The rest of the ground floor, which surrounds the atrium, features an open arcade that extends along the two street frontages, sheltering the entrance to the tube station and a row of shops. The upper floors of Portcullis House are populated with offices around its perimeter, which tail off from a corridor that looks down into the atrium through the glass roof.
The accommodation is arranged in a six storey rectangular block, around a central courtyard. This is roofed at ground floor level by a diagrid of oak members with stainless steel joints, covered by a frameless glass skin. Surrounded by restaurants and the library, with shady trees and tranquil pools, it has become a meeting place and focus for Parliamentary life.
The first floor gallery overlooking the courtyard gives access to a range of Select Committee Rooms. Above, there are five floors of MP's offices with views out either side over the courtyard roof or to the surrounding streets and river embankment.
The building structure had to be co-ordinated with the Westminster Underground Station below. The inner walls around the courtyard are supported on only six columns, tied by a transfer structure of concrete arches. Gullwing precast concrete floor units span onto the perimeter walls of sandstone piers.
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