The Sanskrit word vāstu means a dwelling or house with a corresponding plot of land.
Vastu is a science of architecture that mainly focuses on direction of a living space together with combining all five nature's elements to create a congenial setting/atmosphere helping the occupants to experience peace, prosperity, happiness, and soundness of health.
It is an art of placing through which a balance between negative & positive energies in the structure is maintained.
All with structure building it also includes soil inspection, roads curing, facing of the plots, water, surrounding environment, directions and much more.