-Decreasing construction cost.
This is because the owner can build by their self without assistance of contractor because of the owners already have the guidance about how much fund that is needed. And also the owner already has as built drawing (blue print) so they can directly give it to the worker as the reference in building development.
-Avoid reconstructions cost.
Sometimes the owners feel unhappy when the building is finished. With as buit drawing (blue print) and 3D color perspective drawing, the owner can see from beginning the house model later it to be like to what.
-Can build house gradually.
Accustomed with existing budget with calculation of cost estimation, the owner can detect cost estimation need in every job item.