A more than 90 square meter compact house system can be achieved by connecting 3 building units. The separate elements are first preconstructed in the factory, and then delivered, installed and connected. Between the two units, a waterproof, insulated and structurally rigid connection can be achieved using state of the art, and innovative technology. The TRIPLET can open up new possibilities in function, due to its bigger size, and more open spaces. Available in slanted and flat roof versions. Can be ordered with a green roof, decking, multiple types and colors of both interior and exterior sheeting, solar panels, solar collectors, and many more extras.