The building sector accounts for the consumption of more tan 40% of all the energies and for one third of the CO2 emissions. These numbers are expected to increase dramatically in the next decades. To limit this growth without compromising the comfort levels of the households effort is being put in the development of innovative insulation systems, new concrete types and other materials that can reduce the needs for heating and cooling, under others. This newsletter reviews recent innovations in materials applied to the building industry focused on energy efficiency.