The winning design aims to create a new 'community enterprise hub' adjacent to a development of affordable housing.
The project will also include a doctor's surgery, a crèche, a recording studio, and low-cost office space for charity and local start-up businesses.
A 3W spokesman said the victory was down to the practice's emphasis on producing energy-efficient, sustainable modern design.
'Our approach was to create an environment that provides excellent conditions for the users, focusing on creating an appropriate balance between human comfort, energy efficiency and life cycle costing,' he said.
'The Enterprise Hub will attract a wide range of different users and has been designed to meet all their needs.
'The building is a modern barn that houses all the different users under one roof and provides a town square and meadow to its public front,' he added.
The project team aims to submit a planning application in February.