Redevelopment work at the museum will involve creation of a new central court in the heart of the existing building alongside a new visitor centre.
The contract will also cover fit-out of the new gallery spaces created around the courtyard.
The museum authorities will apply for Heritage Lottery Funding once plans are drawn-up with construction set to start in March 2014 and last until July 2016.
Firms have until July 27 to register their interest with the National Army Museum Royal Hospital Road Mr M O’Connor SW3 4HT Chelsea UNITED KINGDOM +44 2078812469 [email protected] +44 2078236573