A house facing southwest would be sitting on northeast, and thus, can be categorized as a Gen house.
The property would have Gua 8 and falls under the west group of houses in 8 mansions feng shui.
The energy map of a Gen house is illustrated below with the 4 auspicious and inauspicious directions.
The fuwei sector of stability naturally sets up at the sitting of northeast and the sheng qi sector of success will land on the facing of the property.
The other 2 favorable sectors being tian yi and yan nian respectively.
The 4 remaining sectors of jue ming, huo hai, liu sha and wu gui are the unfavorable directional sectors.
For the energy map of a Gua 8 house, the best location for the main door is at the southwest since this is where the sheng qi area is located. This is so that whenever residents return home, they’d activate the sector and bring in energy associated with wealth and success.
Should the southwest be unsuitable for the main door due to some limitations created by the external environment, then another suitable area for the main door at the front of the house is the yan nian area at the west.
If it is an apartment with the main door at the back or side of the residence, then the best locations would be at the northwest or northeast.
The kitchen can be located at any of the inauspicious sectors. But if it is possible to avoid the north, then it will be better as the north houses the Kan gua that is water element based, which is not ideal for the presence of a stove in the kitchen.
Never allow a staircase to be built at the center of the house.
The living areas such as the living room, bedroom and dining room, etc, can be located in any of the good sectors.
While non-living spaces such as the laundry room, bathrooms, storerooms, etc, can be located in the bad sectors.