IMPORTANT SUGGESTIONS

• Do not construct kitchen, toilets and puja-room next to one another. The kitchen should not be directly in front of the main door.
• Keep all electrical/heat generating appliances in the SE corner of the room
• Mirrors, sinks, wash-basins and taps should preferably be along the NE walls
• The safe should open towards the north or the east. So, keep it along south or the
  west.
• The toilet seat should preferably be along the North-South axis.
• The septic tank can be in the NW or the SE corner of the house.
• Avoid having garbage dump, street-light pole, or boulders in front of the main gate or
  door.
• Your main door should not be opposite the main door of another house.
• The number of doors and windows should be more on the ground floor
  and less on the upper floor.
• The north-east corner is the face of the house and should always be kept clean.
  Students should study facing the north or east.
• Do not sit or sleep under a beam.
• Do not hang a painting depicting war, crime, unrest, agony or distress.
• Construct the front door in such a manner as to avoid the fall of a shadow on it.
  Grow a tulsi or basil plant in ront of the house.
• Do not have any cactus in the house. Having it outside the boundary is good.
• Rain water or drainage should flow towards NE-East-North.
• Material to be used in the construction activity should always be new, except in the case of
  renovation.
• Elderly people are always more comfortable in the south-west corner.
• The height of the building should get reduced from the SW to the NE.
• Walls along the SW should be thicker as compared to walls along the NE.
• Do not have a toilet or a puja room under a staircase.
• A well in the middle of a house or plot is very inauspicious.
• Plots with round, triangular, polygonal and other shapes may constantly lead one into
  some problem or other.
• Square and rectangular plots are good.
• Blocking of NE(Ishan) portion of the house/industry resrticts the inflow of the blessings of God. It leads to tension, quarrel and insufficient growth of the inhabitants, especially children of the owner.
• Having a toilet/fireplace in NE corner of the house or industry can ruin it financially besides mental tension & quarrel amongst people.
• More open space in north or east gives name, fame and prosperity.
• Leaving more space on the SW side in the house can affect the male members badly; whereas in industry it leads to financial loss and quarrel amongst partners.
• A water body or source should be in the east or NE of the plot. A water body in
  the south/SE position of the house can cause damage to the male child/wife of the owner.
• A underground water tank in south-west can be fatal to the head of the family or owner of the industry.
• Depression in the SW can result in to a serious illness to the habitants.
• Depression in NW causes enmity and litigation.
• Depression in south portion of the building restricts growth besides financial problems.
• Extension in SW may result in loss of health, loss of money.
• Extension in SE may lead to fire, theft and court litigation.
• Heavy machinery has to be installed in south, west South-West in the factory.
• Finished products are to be kept in the north west corner. It would help quick movements of the stocks & early recovery thereof.
• Transformers, generators, motors, boilers, furnaces, oil-engines etc. should be kept in south-east or southern portion of the plot/building.
• Central space is better left open or used for rituals. kerala's/Rajasthan's traditional four sided house with a central courtyard and verandahs all around, is a 'model' of Vaastu design.

source: Indiavilas.com