GreenSpec provides guidance on green building design, product and material specifications.
Green building products is a directory of sustainable construction products and green building materials available in the UK, product pages feature essential specifier information.
You can find more information about understanding the provenance of construction materials, including their environmental impact under About Materials.
Design guidance includes sections on housing refurb/retrofit, Passivhaus, inspirational images and articles that promote energy and material efficiency.
The energy section provides a guide to renewable energy systems such as wind turbines, ground source heat pumps, biomass boilers, solar PV, solar hot water, micro CHP etc.
More information is available on improving the energy efficiency of existing housing is critical to carbon reduction.