The Story Museum in Oxford has chosen architects Purcell Miller Tritton (PMT) to lead a design team for a major £3.5m redevelopment project being proposed for the attraction.

Due for completion in 2014 to celebrate the city's status as UNESCO World Book Capital, the selection of PMT follows a competitive tender process which attracted 64 submissions. The company held off competition from two others - Hawkins Brown and Pringle Richards Sharratt - at the final stage of the process to land the redevelopment design contract.

Burke Hunter Adams and the Ramboll Group will also work on the scheme, which will lead to a transformation of the 2,000sq m (21,528sq ft) site in the heart of the city. Initial funding for the project's enabling and early design phase was made possible with the help of an anonymous donation in 2009, which secured a 130-year leasehold.

The Story Museum capital project director Tish Francis said: "Our criteria called for a strong sense of engagement with and excitement about the overall vision."