The Sanskrit word vastu means a dwelling or house with a corresponding plot of land. The vrddhi, v?stu, takes the meaning of "the site or foundation of a house, site, ground, building or dwelling-place, habitation, homestead, house". The underlying root is vas "to dwell, live, stay, reside". The term shastra may loosely be translated as "doctrine, teaching".

Vastu-Sastras (literally, science of dwelling) are ancient Sanskrit manuals of architecture. These contain Vastu-Vidya (literally, knowledge of dwelling).

Proposals tracing potential links of the principles of composition in Vastu Shastra and the Indus Valley Civilization have been made, but Kapila Vatsyayan is reluctant to speculate on such links given the Indus Valley script remains undeciphered. According to Chakrabarti, Vastu Vidya is as old the Vedic period and linked to the ritual architecture. According to Michael W. Meister, the Atharvaveda contains verses with mystic cosmogony which provide a paradigm for cosmic planning, but they did not represent architecture nor a developed practice. Varahamihira's Brihat Samhita dated to the sixth century CE, states Meister, is the first known Indian text that describes "something like a vastupurusamandala to plan cities and buildings". The emergence of Vastu vidya as a specialized field of science is speculated to have occurred significantly before the 1st-century CE.

There exist many Vastu-Sastras on the art of building houses, temples, towns and cities. One such Vastu Sastra is by Thakkura Pheru, describing where and how temples should be built. By 6th century AD, Sanskrit manuals for constructing palatial temples were in circulation in India. Vastu-Sastra manuals included chapters on home construction, town planning, and how efficient villages, towns and kingdoms integrated temples, water bodies and gardens within them to achieve harmony with nature. While it is unclear, states Barnett, as to whether these temple and town planning texts were theoretical studies and if or when they were properly implemented in practice, the manuals suggest that town planning and Hindu temples were conceived as ideals of art and integral part of Hindu social and spiritual life.

The Silpa Prakasa of Odisha, authored by Ramacandra Bhattaraka Kaulacara sometime in ninth or tenth century CE, is another Vastu Sastra. Silpa Prakasa describes the geometric principles in every aspect of the temple and symbolism such as 16 emotions of human beings carved as 16 types of female figures. These styles were perfected in Hindu temples prevalent in eastern states of India. Other ancient texts found expand these architectural principles, suggesting that different parts of India developed, invented and added their own interpretations. For example, in Saurastra tradition of temple building found in western states of India, the feminine form, expressions and emotions are depicted in 32 types of Nataka-stri compared to 16 types described in Silpa Prakasa. Silpa Prakasa provides brief introduction to 12 types of Hindu temples. Other texts, such as Pancaratra Prasada Prasadhana compiled by Daniel Smith and Silpa Ratnakara compiled by Narmada Sankara provide a more extensive list of Hindu temple types.

Ancient Sanskrit manuals for temple construction discovered in Rajasthan, in northwestern region of India, include Sutradhara Mandana’s Prasadamandana (literally, manual for planning and building a temple) with chapters on town building. Manasara shilpa and Mayamata, texts of South Indian origin, estimated to be in circulation by 5th to 7th century AD, is a guidebook on South Indian Vastu design and construction. Isanasivagurudeva paddhati is another Sanskrit text from the 9th century describing the art of building in India in south and central India. In north India, Brihat-samhita by Var?hamihira is the widely cited ancient Sanskrit manual from 6th century describing the design and construction of Nagara style of Hindu temples.

These ancient Vastu Sastras, often discuss and describe the principles of Hindu temple design, but do not limit themselves to the design of a Hindu temple. They describe the temple as a holistic part of its community, and lay out various principles and a diversity of alternate designs for home, village and city layout along with the temple, gardens, water bodies and nature.

The central area in all mandala is the Brahmasthana. Mandala "circle-circumference" or "completion", is a concentric diagram having spiritual and ritual significance in both Hinduism and Buddhism. The space occupied by it varies in different mandala – in Pitha (9) and Upapitha (25) it occupies one square module, in Mahaapitha (16), Ugrapitha (36) and Manduka (64), four square modules and in Sthandila (49) and Paramasaayika (81), nine square modules. The Pitha is an amplified Prithvimandala in which, according to some texts, the central space is occupied by earth. The Sthandila mandala is used in a concentric manner.^[34]

The most important mandala is the Manduka/ Chandita Mandala of 64 squares and the Paramasaayika Mandala of 81 squares. The normal position of the Vastu Purusha (head in the northeast, legs in the southwest) is as depicted in the Paramasaayika Mandala. However, in the Manduka Mandala the Vastu Purusha is depicted with the head facing east and the feet facing west.^{[citation needed]}

It is believed that every piece of a land or a building has a soul of its own and that soul is known as Vastu Purusha.^[35]

A site of any shape can be divided using the Pada Vinyasa. Sites are known by the number of squares. They range from 1x1 to 32x32 (1024) square sites. Examples of mandalas with the corresponding names of sites include:^[8]

• Sakala (1 square) corresponds to Eka-pada (single divided site)
• Pechaka (4 squares) corresponds to Dwi-pada (two divided site)
• Pitha (9 squares) corresponds to Tri-pada (three divided site)
• Mahaapitha (16 squares) corresponds to Chatush-pada (four divided site)
• Upapitha (25 squares) corresponds to Pancha-pada (five divided site)
• Ugrapitha (36 squares) corresponds to Shashtha-pada (six divided site)
• Sthandila (49 squares) corresponds to sapta-pada (seven divided site)
• Manduka/ Chandita (64 square) corresponds to Ashta-pada (eight divided site))
• Paramasaayika (81 squares)
• Paramasaayika (81 squares) corresponds to Nava-pada (nine divided site)
• Aasana (100 squares) corresponds to Dasa-pada (ten divided site)
• bhadrmahasan (196 squares) corresponds to chodah -pada (14 divided sites)

Vastu sastra represents a body of ancient concepts and knowledge to many modern architects, a guideline but not a rigid code.