UK practice Julian Harrap Architects, in collaboration with Jamie Fobert Architects has won the Charleston museum commission in East Sussex, UK, beating hundreds of other entries.
The £3.5m scheme will involve restoration and redevelopment of the grade II-listed barn and agricultural buildings.
The project will also include reconstruction of an 18th-century granary wing and will be equipped with new facilities including an auditorium, studio spaces for educational and practical workshops, exhibition and storage spaces, and a restaurant / café.
The project is being developed by the Charleston Trust which procured funds from the Heritage Lottery Fund.
Other finalists for the scheme included 6a Architects, Dow Jones, Purcell Miller Tritton, Tony Fretton, Haworth Tompkins and Caruso St John.