Window-to-Wall Ratio
The N and E walls should have the highest window-to-wall ratio (more openin...
Local term: Window-to-wall ratio, WWR, passive solar, directional openness
All traditions agree: more windows on N and E walls, fewer on S and W walls. Modern passive solar design independently recommends the same: maximize north light (even, diffused), allow morning east light, minimize harsh afternoon west sun, and protect from southern heat gain. Vastu and sustainable architecture align perfectly on this rule.
Unique: This is one of the Vastu rules most perfectly aligned with modern sustainable architecture and passive solar design principles. Both disciplines recommend the same directional openness gradient for their respective reasons.
Window-to-Wall Ratio
Architectural diagram for Window-to-Wall Ratio
The Rule in Modern Vastu
Ideal
N, E
N and E walls have the highest window-to-wall ratio (more openings, more light and air entry).
Acceptable
NE, NW
NE and NW walls can have moderate windows.
Prohibited
S, W, SW
S and W walls should have the lowest window-to-wall ratio. SW wall should be the most solid.
Sub-Rules
- N and E walls have higher window-to-wall ratio than S and W▲ Moderate
- Large windows on S or W walls (excessive openings on heavy sides)▼ Moderate
- SW wall has large windows or glass facade▼ Major
- NE corner has large window or glass allowing maximum light entry▲ Moderate
The N and E walls should have the highest window-to-wall ratio (more openings) while the S and W walls should be more solid (fewer, smaller windows). This creates a gradient of openness that mirrors the prana flow — light enters from the divine directions and grounds against the heavy walls.
Common Violations
Large floor-to-ceiling windows on the S or W wall with small windows on the N and E
Traditional consequence: Inverted light gradient — harsh afternoon sun enters while beneficial morning light is blocked. Household tempers flare, aggression, eye strain, overheating
SW wall is mostly glass (glass facade on the heavy corner)
Traditional consequence: The earth-anchor corner is made transparent and light — the grounding energy leaks out. Loss of stability, authority, and family structure
NE corner has no windows (solid wall at the divine corner)
Traditional consequence: The divine light entry point is sealed — prana cannot enter. Spiritual stagnation, blocked opportunities, lack of inspiration
How Other Traditions Compare
Relative to Modern Vastu
Rajasthani Jharokha (projecting window) tradition places the most ornate and numerous windows on N and E facades — a decorative expression of the directional opening rule.
Wada thick-stone S/W walls (sometimes 2+ feet) with minimal openings demonstrate the maximum wall-mass principle on the heavy sides.
Tamil Pada grid window allocation — more window-Padas on N/E walls — is the most mathematically rigorous window-placement system.
Kakatiya palace window placement — ornamental N/E facades with defensive S/W walls — combines Vastu with military architecture.
Hoysala perforated stone Jali screens on N/E walls — filtering light into sacred patterns — are the most artistically refined window treatment in Indian architecture.
Kerala Thalavara proportional system for window sizing — window dimensions as mathematical fractions of wall area — integrates structural proportion with Vastu direction.
Gujarat Haveli Jharokha (projected window) tradition concentrates the most elaborate and numerous windows on N and E facades.
Colonial Kolkata French window placement — large N/E openings, small S/W openings — perfectly aligns Vastu with tropical passive cooling design.
Kalinga temple perforated N/E stone windows (Baatayan) demonstrate the directional opening principle with elaborate carved screens.
Gurdwara facade design — open N/E for divine light, solid S/W for structural support — embodies the directional opening gradient.
Terms in Modern Vastu
Universal:
Remedies & Solutions
Curtains/blinds on S/W windows (easiest). UV-filtering glass on S/W (moderate). Add N/E windows during renovation (structural). Mirror on N/E wall if no window possible (symbolic).
Modern VastuAdd curtains, blinds, or frosted film on oversized S/W windows to reduce effective opening — maintains wall mass symbolically while allowing some light
Install tinted or UV-filtering glass on S/W windows to reduce harsh sun entry while maintaining the window structure
If NE corner has no window, add a mirror or reflective surface to simulate an opening — visually and energetically creates the impression of an opening
Add a new window opening on the N or E wall during renovation to increase the light-side opening ratio
Remedies from other traditions
Heavy curtains on S/W windows. Add windows on N/E during renovation.
Vedic VastuStructural correction per Maharashtrian building proportion guidelines
HemadpanthiClassical Sources
“The walls facing Uttara (north) and Purva (east) shall have the most Gavaksha (windows). These walls receive the sacred light and the beneficial Vayu. The walls of Dakshin (south) and Paschim (west) shall be thick and solid, with few openings.”
“Open the dwelling to the north and east — more windows, more light, more air. Close it to the south and west — thicker walls, fewer openings, protection from harsh elements.”
“The dwelling should face the light directions with open countenance and the heavy directions with closed shield. More window in north and east brings prosperity; more wall in south and west brings stability.”
“The divine architect distributes windows by direction: Uttara and Purva receive the most, for these walls breathe in divine Vayu. Dakshin and Paschim receive the fewest, for these walls must anchor earth and resist fire.”
“The builder creates a gradient of openness: maximum at the light walls (north, east), minimum at the heavy walls (south, west). This gradient mirrors the flow of prana — entering through open walls and grounding against solid ones.”
“The Ratnakara prescribes: count the openings in each wall. North and east should exceed south and west. The ratio of light-wall openings to heavy-wall openings determines the dwelling's breathing capacity.”
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