ZedFactory has created a zero-emission prefab home, purported to be Britain?s most affordable green prefab home. The base model is a heavily insulated, timber-framed residence, with low-energy, low-water fixtures with a greenroof. The code six level, the highest in the new UK green building rating system ?The Code For Sustainable Homes,? would also include a rainwater tank, and solar panels, with optional wind turbines adding even more efficiency (Chapa, 2008).