This is the R4 Houses, designed by Spanish architect Luis de Garrido. R4 House, refers to housing that is reuse, recover, recycle and reason. Appeared in 2007 as the first two energy efficient housing in the world made from recycled, reused and recovered, with zero energy, without producing waste either in construction or in its deconstruction.
They are totally green homes, zero energy consumption of conventional energy thanks to its self-regulating heat bioclimatic advantage of geothermal and solar energy. Thus, in the construction of both houses has not come to generate residue.
Another advantage of this type of housing is very cheap, for one, the 150 square meters, has a construction cost of 60,000 euros, while the other, 30 square meters, amounting to 12,000 euros.