North-West-facing Toilet

The recommendation

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 toilet?

Toilet windows are entirely about ventilation and a single shaft of light — small, high-sill, opaque or louvred glass for privacy. An exhaust fan + a small openable window is the standard, never just one or the other.

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 north-west face in this climate, the recommendation is a sliding 2t (cross-ventilation) window with clear glazing and a sill at 2.5' — calibrated for year-round high humidity, moderate temperatures, and monsoon-driven cross-ventilation.

Common mistakes

• Clear glass at eye-level instead of frosted / louvred
• Window opening onto the same shaft as the kitchen — odour transfer
• No window at all — dependence on exhaust fan alone, which fails when power cuts
• Treating it as an air-conditioning problem — in Kolkata's humidity, cross-ventilation across opposite walls always beats sealed AC reliance.

Other directions for this room

Other rooms in this direction