Window Guide · Mumbai
South-West-facing Master Bedroom
South-West is the ideal Vastu direction for a master bedroom. warm-humid climate adds specific window-design choices.
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 master bedroom?
A master bedroom needs cross-ventilation for sleep quality, controlled morning light (so the room doesn't double as a sunrise alarm), and visual privacy from neighbouring plots. Two windows on perpendicular walls is ideal — one bigger for light, one smaller for airflow.
Stillness and stability. Master suite, heavy storage, the home's grounding corner.
Vastu's ideal placement for a master bedroom is SW — South-West sits in this band.
Why Mumbai's climate matters
Mumbai 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-west face in this climate, the recommendation is a sliding 2t (cross-ventilation) window with clear glazing and a sill at 3.5' — calibrated for year-round high humidity, moderate temperatures, and monsoon-driven cross-ventilation.
Common mistakes
- Placing the largest window on the east wall — early sun disturbs sleep cycles
- Bed-head against the same wall as the window — drafts and noise reach the sleeper directly
- Mirrors directly opposite the bed reflecting the sleeping body
- Treating it as an air-conditioning problem — in Mumbai's humidity, cross-ventilation across opposite walls always beats sealed AC reliance.