Bloc overcame a final shortlist that included Moxon, Surface Architects and Francesco Draicsi - all of which are featured in the AJ's 40 under 40 list.
The competition called for each practice to come up with concept designs for a new contemporary gallery inside the museum's Cromwell Road building.
And despite eventually losing out to Bloc, Moxon boss Ben Addy (whose scheme is pictured here) was more than happy to have made the final four.
He said: 'It's a great achievement, especially if you consider Bloc has been going for 8 years, and we are only in our second.
'The museum is intending to have the gallery in place by this time next year, and the great thing is they have asked us to get involved in another exhibition.'