Popular Vastu asks for more and larger windows on the north and east sides of a home and fewer, smaller ones on the south and west. The classical texts we read do not give a rule on window placement. The modern advice is a sensible one, because it matches the sun: the north and east bring gentle light, and the south and west bring heat. This page sets out the rule, where it comes from and what good ventilation needs.
What the texts say
We found no verse on windows in the Brihat Samhita’s chapter on houses or in Acharya’s summary of the Manasara. The Brihat Samhita’s chapter has a good deal to say about the gate and the door, but not about window openings. Neither did the summary we read give a direction for them. Other treatises may.
What the tradition does value is the opening of the home to the east, the direction of the morning sun, and the north-east, the quarter of light. It also asks that the centre be kept clean and open (53.66), which in a modern home means free movement of air. That is the closest classical echo to a ventilation rule.
The modern rules
| Suggestion | Source | Plain reading |
|---|---|---|
| More and larger windows in the north and east | Modern | Gentle light and cooler air |
| Fewer and smaller windows in the south and west | Modern | Reduces afternoon heat |
| Windows in pairs, opposite each other | Modern | Cross ventilation |
| Windows open outward | Modern | Opens clear of curtains; a preference |
| No window directly above the main door | Modern | Visual preference |
| An even number of windows | Modern | A counting tradition; no verse found |
| Ventilator or exhaust high on a wall | Modern, and practical | Hot air rises |
The first two rules reward a moment’s thought. In most of India, a window to the south or west lets in the hot afternoon sun. A home with large openings to the north and east and small, shaded ones to the south and west is cooler and brighter than the reverse, whatever its Vastu credentials. South of the equator the midday sun stands in the north, so a north window there gets strong sun and a south window gets the gentle light. Vastu does not reverse its directions for the southern hemisphere, so a reader in Sydney or Johannesburg is better served by the sun than by the chart. Use the sun, and treat the compass rule as a preference.
What good ventilation needs
Fresh air is the thing that matters most, and a few principles do the work.
- Cross ventilation. Windows on two opposite or adjacent walls let air pass through. A single window in a closed room gives little.
- Inlet low, outlet high. Cool air enters near the floor and hot air leaves near the ceiling. A high ventilator above a window helps.
- Kitchen and bathroom exhaust. These two rooms need a window or an exhaust fan to take out steam, smoke and smell. See the kitchen page and toilets and water.
- Shade. A chajja, an overhang or a blind to the south and west keeps out the sun while letting the air through.
- Insect screens. Mesh keeps out mosquitoes without blocking the air.
- Security. Grills and locks, especially on lower floors.
A room without a window, like a store or an inner bathroom, should have mechanical ventilation. The basement page covers the same issue below ground.
Light through the day
Think about when each room is used. A bedroom benefits from morning light and a cool evening, so an east window and a curtain on the west suit it. A study wants even daylight and little glare, as described on the study room page. A living room that is used in the evening can take a west window with a shade. The sun lands differently in each season, so a simple test is to visit each room at morning, noon and late afternoon, and notice where it is too dark or too hot.
Windows in flats
In a flat you rarely choose the window positions. Many flats have a single side of windows, with a balcony and a back window in the kitchen. Open them in the cool hours, keep the internal doors open for a draught, and use a fan to move air. A balcony door that opens wide is a great source of ventilation; the balcony page explains how to use it. The apartments page describes how much of the old plan carries over.
Air quality
In cities with polluted air, open windows are a trade-off. Many people open them early in the morning and keep them shut at rush hour or at peak pollution. An air purifier, a plant or two, and regular cleaning help. Moisture and mould are the other pest: keep windows open to dry the bathroom after use, and fix leaks around frames.
What cannot be changed, and what helps
If your windows face south or west and are large, you do not need to brick them up. The texts we read say nothing on the matter. Helpful steps:
- Fit curtains, blinds or a reflective film.
- Plant a tree or a creeper outside, as described in plants and the garden.
- Open windows when the air outside is cool.
- Keep the north and east windows clear of clutter so that light enters.
- Clean the glass and the sills, which makes a room feel brighter at no cost.
See remedies without demolition for the principle of small steps, and the room-by-room table for the chart.
Frequently asked questions
↳ Which side should have more windows in Vastu?
Modern guides say the north and east, with fewer on the south and west. We found no classical verse on windows. The rule matches the sun, as the north and east give gentle light and the south and west bring heat.
↳ Does the southern hemisphere reverse Vastu directions?
No. The directions stay the same. The midday sun, however, stands in the north south of the equator, so the practical advice about light and heat differs from the popular chart. Use the actual path of the sun.
↳ Should the number of windows be even?
Some guides say so. It is a modern counting tradition and we found no verse for it. Choose the number that gives good light and cross ventilation.
↳ What if my room has no window?
Fit an exhaust fan or a ventilator, and keep the door open when you can. Fresh air matters more than any direction.
Sources
- Varahamihira, Brihat Samhita, chapter 53, verse 66, in the English translations of Iyer and Sastri, for care of the centre of the plan.
- Prasanna Kumar Acharya, Summary of the Manasara, in which we found no direction for windows.
- Window placement and count rules are modern teaching and are not traced to a verse in the texts read for this site.