The home builder business has a long business history started from a normal contractor to design-to-build business. In the past, the design part and the construction part is divided into different zone and business. During that time, designer firm is only doing the design job without building while the contractor builds but not doing the design works. Later on, as both businesses are relating to each other, then the “turn-key” business is born not long after that. The turn-key firm or home builder is the all-in-one business ranges from design to build.