The sustainability of the system is defined by the simplicity of building. Due to the fact that all the pieces from TerraVis houses are predimensioned and ready for assembly, one of the most expensive and polluting operations in building works disappears. If there is no need for this operation, than the skilled labour is no longer necessary. That means that we have created a system that reduces on-site work to minimum and can be mounted by anyone, like a family game. The types of TerraVis elements allow an almost infinite combination of solutions like a Lego game, that can be put into operation by anyone.