Indian guides commonly cite about 0.3 sq m of opening for a bathroom or WC, though some secondary sources quote other figures. The National Building Code is a model code, and your municipal bye-law sets the actual minimum. Confirm the figure with your architect, and check whether it means the full opening or the clear openable area.
Guides say a bathroom must be ventilated either naturally, through an opening to outside air or a shaft, or by a mechanical exhaust ducted to outside air. A windowless bathroom is acceptable only with a compliant exhaust system. Check your local bye-law, because it decides what is accepted for approval.
Yes, when the finish and fittings are right. Indian guides describe powder-coated aluminium as rust-resistant and low maintenance in humid rooms. The weak points are usually the hardware, so ask for SS 304 fittings, and near the sea ask about the powder coat quality as well as the profile.
Louvres give constant airflow and privacy without a straight line of sight, and their blades shed rain, but they are the least secure type. A sliding window opens only about half its area. For many bathrooms a top-hung sash with frosted glass is a sound middle path.
Obscure glass: frosted, acid-etched, ground or patterned. It admits daylight without a view. Use toughened glass where the pane is low, near the shower or within reach from outside. Guides suggest placing the sill at about 1.5 to 1.7 m for privacy.
Yes, but plan it before the glass is ordered. Toughened glass cannot be cut after toughening, so the fan opening must be made first and sized to the fan you choose. The fan must exhaust to outside air and needs an inlet, such as a 10 to 15 mm door undercut.
Guides suggest a sill height of about 1.5 to 1.7 m from the floor, which keeps privacy without relying on curtains. Combine the high sill with obscure glass. In a small bathroom with a low ceiling, check that the head of the window still fits under the beam or slab.
