Tod Williams Billie Tsien Architects' major extension and renovation of the Hood Museum of Art in New Hampshire has kept postmodern architect Charles Moore's glass and grey-brick stairway as its centrepiece.
The Dartmouth College arts institution is set to open on 26 January 2019, following the effort to increase its teaching facilities, and add galleries to show more of its extensive collection of over 65,000 works.

Tod Williams Billie Tsien Architects' project adds 40 per cent of floor space to the Hood Museum, which Moore completed in 1985, increasing its size to 62,400 square feet (5,797 square metres). Additions include six new galleries to the existing 10, and three new classrooms featuring the "latest object- study technology" ? tripling the number of teaching spaces previously.
Curved around a courtyard, the original building nestles between the campus' 19th-century red-brick Wilson Hall and the modernist Hopkins Center for the Performing Arts, built by Wallace K Harrison in 1962.

Husband-and-wife duo Williams and Tsien have covered this outdoor area to create a ground floor space for meetings, dinners and performances, and galleries on the floor above.
The lower lobby includes a double-height entrance into the museum, with Moore's existing glazed stairwell running alongside to allowing natural light into the galleries behind.

The new roof acts as a shading device for the windows in the staircase, preventing glare that previously obstructed the v...