What is the ideal window size for a south-facing pooja room in Kolkata?

Vastu and warm-humid climate together suggest a window approximately 3.5 feet wide with a sill height of 3 feet on a south face for a pooja room in Kolkata. Type: Sliding 2T (cross-ventilation). Glazing: clear.

Is South an auspicious direction for a pooja room per Vastu?

Vastu's traditional ideal for a pooja room is NE, not South. The room remains habitable with simple window-design choices that neutralise the directional bias — see the recommendations on this page.

Why does Kolkata's warm-humid climate need clear glazing?

Kolkata sits in the Warm-Humid climate zone (High heat with high humidity. Cross-ventilation is survival; rain protection is structural.). For warm-humid climates, clear glazing balances solar gain, heat retention, and visibility — Verandahs are not decoration here — they are the building's lungs. Skip them and the house cannot breathe in monsoon.

Window Guide · Kolkata

South-facing Pooja Room

South is not the traditional Vastu placement for a pooja room, but the room remains usable. Window design + simple remedies neutralise the directional bias.

Warm-HumidWest BengalYama · Agni (Fire)Vastu: avoid

The recommendation

Width

3.5'

~107 cm

Sill Height

mid sill — measured from finished floor

Type

Sliding 2T (cross-ventilation)

Glazing

clear

Single 6 mm

Overhang / chajja

3.5'

Minimum projection above the window

WWR

25–30%

Total window-to-wall ratio for the room

These figures are advisory — drawn from IS 3792 (Warm-Humid zone) and Vastu Shastra teaching tradition. An architect should adapt them to your plot's exact bearing, plinth height and facade design.

Why this direction for a pooja room?

A pooja room window's job is to bring morning light to the deity at dawn — small, high-sill, and on the NE wall ideally. The window should never face directly at the deity but rather light the side wall, creating soft fill light during morning aarti.

Yamaयम

Discipline, storage, mass. The heaviest face — anchor with weight, not lightness.

Vastu's ideal placement for a pooja room is NE. South is outside the traditional band, though with simple remedies the room works well.

Why Kolkata's climate matters

Kolkata is in the Warm-Humid climate zone (Aw, Am, Af per the Köppen scale; Warm-Humid per NBC 2016). Summer temperatures: 30-38°C, winters: 18-28°C. Rainfall: 1000-3000 mm/year. Humidity: >70%.

Verandahs are not decoration here — they are the building's lungs. Skip them and the house cannot breathe in monsoon.

For a south face in this climate, the recommendation is a sliding 2t (cross-ventilation) window with clear glazing and a sill at 3' — calibrated for year-round high humidity, moderate temperatures, and monsoon-driven cross-ventilation.

Common mistakes

Pooja shelf placed against a toilet's plumbing wall
No window — reliance on artificial light only
Windows opening onto a common-area corridor instead of fresh air
Treating South placement as a hard error — it's not. The room remains usable; a small Vastu remedy (heavy furniture on the NE wall, mirror placement away from the bed) handles the directional refinement.
Treating it as an air-conditioning problem — in Kolkata's humidity, cross-ventilation across opposite walls always beats sealed AC reliance.