Vastu shastra aims at achieving harmony with the laws of nature. It tries to balance different forces so as to achieve a positive effect on the inhabitants of the house. The ancient architectural science of Vastu Shastra works by balancing your environment in accordance with the natural laws inherent in the universe.
Boundary wall: Compound walls should be of equal thickness on all four sides. The South and West walls can be made thicker as it can also prevent the afternoon sun from coming in with full fury.
Garage: This is best constructed in the Northwest or Southeast corner of the plot. The main consideration is that the watchman should be able to get a good view of the entire plot.
Water reservoir or tank: Northeast is the preferred direction for the water source.