Six contractors have entered bids to build a £45m underground gallery and courtyard extension at the V&A Museum in London.
Balfour Beatty, Bam Construction, Mace, Mansell, Skanska and Wates submitted bids for the 34-month project to transform the museum.
Bidders were named by construction industry analysts Glenigan.
The scheme includes demolition of existing buildings and structures on the Boiler House Yard site and the development of an external courtyard to be entered from Exhibition Road.
An underground gallery space will also be built for temporary exhibitions, and facilities including a new shop and café will be constructed.
Lend Lease is project managing the scheme, with Arup appointed as geological and civil engineering consultant.