Svadhistana chakra(sacral) is in the lower stomach region near the kidneys. It is related to water principle On the Vastu Purusha Mandala; it is to the South and to the West. Therefore the wet areas like bathroom etc are recommended in the south or in the west portions of the building. It is for sewerage.
Manipura Chakra(navel) is at the navel; and relates to energy or fire.. While in the womb of the mother, the fetus is fed with the essence of food and energy through the umbilical chord connected with its navel. The Vastu Purusha Mandala shows Brahmathe divine god at the navel of the Vastu Purusha. Further, the lotus is the base of Brahma. Thus navel connects Brahman with Jiva or life. It is left open and unoccupied. The central portion of the building is to be kept open. It is believed that Vastu Purusha breaths through this open area.
Anahata chakra(heart) is near the heart. It is related to vayu /air regulated by lungs. The lung region of the Vastu Purusha should be airy.
Vishuddaha chakra(throat) is near the throat from where the sounds come out and reverberate in space. This region represents ,.the word OM is uttered through throat. The echo of that sound vibrates in the hallow of the bone-box of the head and in the space in brain. The head of Vastu Purusha is in the North East corner
Ajna chakra is between the eyebrows. This direction is related to open spaces Atmospherically, North East is cooler; and so should be ones head. The puja/prayet room is recommended in the North east portion of the house.