After graduating from the Department of Architecture at Kanto Gakuin University, Itsuko Hasegawa became a research student in the Department of Architecture at Tokyo Institute of Technology. In 1979 she established Itsuko Hasegawa Atelier. Her projects include a variety of houses and public buildings. In 1986 she received the Design Prize from the Architectural Institute of Japan for her Bizan Hall project. Her residential projects also earned a Japan Cultural Design Award. She won first prize in the open competition for the Shonandai Cultural Center. In 1997 she was elected as one of the Honorary Fellows of RIBA.  She has completed her winning entry for the Niigata City Performing-Arts Center and Area Development.  In 2000 she received the Japan Art Academy Award. In 2001 she received the Honorary Degree Award at University College London. In 2006 she was elected as one of the Honorary Fellows of AIA.