The last and the best score of sustainable home design goes to Robles Arquitectos. This gorgeous house is located right above the ocean, 20km away from Costa Rica city crowd. Sloping solar panel roof is stretched covering all room which designed in square booths. It has two floors: the 1st or basement is open and capacious room without any bulkheads, while the upper floor consists of some bedrooms, living room, bathroom, and balcony. Robles Arquitecos mainly made of woods which obtained from non-endangered or non-protected forest. Well, that’s all top four sustainable homes which surely make anyone tempted to stay there!