Overhang Prohibition on S/W
Extended S/W overhangs are prohibited — they cast deep shadows that darken the d
Local term: ओवरहैंग डिज़ाइन — सोलर शेडिंग / चज्जा डेप्थ ऑप्टिमाइज़ेशन (Overhang Design — Solar Shading / Chajja Depth Optimization)
Modern passive solar design supports generous N/E overhangs and minimal S/W projection. Deep S/W overhangs trap heat rather than deflecting it, creating hot stagnant zones. Modern solar shading design uses vertical fins or adjustable louvres on S/W rather than fixed deep overhangs.
Source: All classical texts; passive solar design standards
Unique: Modern louvres and fins — vertical S/W shading replacing fixed deep overhangs.
Overhang Prohibition on S/W
Architectural diagram for Overhang Prohibition on S/W
The Rule in Modern Vastu
Ideal
N, NE, E
Generous N/E overhangs, vertical fins or minimal overhangs on S/W, per modern Vastu consensus integrating classical prescriptions with contemporary building practice — the architect must verify compliance for optimal results.
Acceptable
all
Standard 12-18 inch Chajja on all sides.
Prohibited
S, SW, W
Extended S/W overhangs — deep Chajja, wide eaves, or projecting roof beams — cast deep, permanent shadows on the S/W walls and ground. These shadows extend the Tamas (darkness) zone of the dwelling further than necessary. The S/W already receives the harshest Agni (fire) energy — deep shadows at S/W trap heat beneath the overhang while blocking outward radiation, creating stagnant hot pockets. This is Atirikt Chhaya Dosha (excessive shadow defect) — the dwelling darkens its own heavy zone further.
Sub-Rules
- Roof overhangs on N/E facades provide beneficial shade and rain protection▲ Moderate
- Deep extended overhangs on S/W facades casting heavy shadows▼ Moderate
Extended S/W overhangs are prohibited — they cast deep shadows that darken the dwelling's harsh-direction zones, trapping stagnant energy beneath the overhang. N/E overhangs are beneficial. Standard-depth Chajja (12-18 inches) on S/W is acceptable for rain protection; it is the excessive depth that creates Atirikt Chhaya Dosha.
Common Violations
Deep extended overhang on S facade casting permanent shadow on the south wall and ground
Traditional consequence: Atirikt Chhaya Dosha on the Yama wall. Deep shadow at the Dakshina face traps Yama's harsh energy in a dark pocket. Solar purification of the south wall is blocked. The stagnant shadowed zone accumulates negative energy.
Wide projecting eaves or roof beams on the W facade creating deep afternoon shadow
Traditional consequence: Paschima Gahana Chhaya (west deep shadow). The west wall needs afternoon sun exposure to bake out moisture and disperse Varuna's energy. Deep shadow at W creates a damp, dark zone where negative energy stagnates.
How Other Traditions Compare
Relative to Modern Vastu
Vedic Atirikt Chhāyā Doṣa — excessive shadow defect at S/W — distinctive to Vedic practice per the Brihat Samhita and Vishwakarma Prakash.
Wada N/E deep Chhajjā vs minimal S/W projection — distinctive to Hemadpanthi practice per the Samarangana Sutradhara and Hemadpanthi building traditions.
Tamil solar purification — S wall needs sun to disperse harsh energy.
Telugu Surya therapy — south sun exposure as therapeutic — distinctive to Kakatiya practice per the Samarangana Sutradhara and Kakatiya inscriptions.
Jain Atirēka Niḷalu — excessive shade as a defect — distinctive to Hoysala-Jain practice per the Manasara and Aparajitapriccha.
Kerala eave length differential — shorter S/W, longer N/E — distinctive to Thachu Shastra practice per the Thachu Shastra and Manushyalaya Chandrika.
Gujarati Pol street shade — deep N/E Chajja serves community.
Bengali N/E overhang vs flush S/W in Kolkata architecture — distinctive to Vishwakarma practice per the Shilpa Prakasha and Vishwakarma guild traditions.
Kalinga temple — generous N/E pilgrim shade, minimal S/W — distinctive to Kalinga practice per the Shilpa Prakasha and Kalinga temple texts.
Punjabi generous N/E Chhajjā tradition — distinctive to Sikh-Vedic practice per the Vedic Vastu principles adapted through Sikh architectural traditions.
Terms in Modern Vastu
Universal:
Remedies & Solutions
Structural correction per Modern building proportion guidelines
Modern VastuTrim S/W overhangs to standard Chajja depth (12-18 inches) — remove any extension beyond basic rain protection
If deep S/W overhangs cannot be removed, install upward-facing lights beneath them to brighten the shadowed wall and ground
Paint the underside of S/W overhangs in white or light reflective colours to maximize reflected light in the shadow zone
Replace solid S/W overhangs with perforated or slatted designs that allow sunlight to penetrate while still providing rain protection
Remedies from other traditions
Structural correction per Vedic building proportion guidelines
Vedic VastuStructural correction per Maharashtrian building proportion guidelines
HemadpanthiClassical Sources
“The Prastha (overhang) on the Dakshina and Paschima faces shall not extend beyond standard measure. Deep Dakshina Prastha casts Gahana Chhaya (deep shadow) that darkens the Yama zone further. The Dakshina wall needs sun — not deeper shade. Extended shade at Dakshina traps trapped Agni energy beneath the overhang.”
“Varahamihira warns: the Chhadya Prasarana (roof extension) on the Dakshina and Paschima shall be minimal. Deep Chhaya on Dakshina adds Tamas where Rajas already dominates. The Dakshina wall benefits from direct Surya that strikes and disperses the harsh energy. Overhang-shade traps it instead.”
“The Thekku and Merkku Kooda Neettippu (S and W roof extension) shall not exceed standard Chajja measure. Deep Thekku Nizhal (south shade) darkens the Yama zone. The Thekku wall needs direct Kathiravan (sun) to purify harsh energy. A deep overhang blocks this purification.”
“Vishvakarma instructs: the Dakshina-Paschima Chhajja shall be Nyuna (minimal) — standard rain protection only. Extended Chhajja at Dakshina casts Gahan Chhaya that converts the harsh zone into a dark alcove where stagnant energy accumulates.”
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