There is a need to reduce the emissions of the country as a whole, limit the risk of climate change due to Global warming, and meet targets set by the Kyoto agreement and the Climate Change Act. The large number of houses constructed annually in England and Wales have an important role to play in this. By reducing emissions, resulting from both the manufacture of construction materials and the energy used by house occupants, housing can help achieve the necessary emissions reductions. Alternative construction methods can contribute to this, either by having a lower embodied energy or by demonstrating good thermal properties to limit heat loss and hence operational energy. However, it is essential that both the construction industry and the public accept alternative construction methods for them to be economically viable.