The shortlist, which includes a wide range of projects from a flood-defence system designed by Faber Maunsell to WHAT_Architecture's rooftop nursery in Hackney, east London, was unveiled by CABE.
Prime Minister Tony Blair said: 'I congratulate all contenders for this year's award. They represent the very best in the design and commissioning of public buildings and also demonstrate how our design and construction industries are successfully rising to the threat of climate change.'
According to CABE, the shortlist shows how buildings can be made more sustainable through innovation in design and construction.
CABE chair John Sorrell said: 'This shortlist shows that the most sustainable procurement and the most beautiful designs are now coming from public-sector clients determined to combine eco-friendly design with strong social benefits.'
Click here to view the full shortlist.