A bathroom window has a harder job than any other window in the house. It needs to let out steam and smells, let in some daylight, and still keep the room completely private. In most Indian homes it also has to hold an exhaust fan. Get it wrong and you end up with damp walls, mould in the corners and a fan rattling in a frame that was never designed for it. A well-planned bathroom aluminium window solves all of this in a small, tidy opening.
This guide covers the common designs, typical sizes, glass options and the details that keep a bathroom dry.
Why Aluminium Works Well in Bathrooms
Bathrooms are humid almost all day. Wooden frames swell and rot, and mild steel rusts. Aluminium does neither. It is light, it holds glass and a fan securely, and powder-coated or anodised finishes shrug off moisture. It is also easy to clean, which matters in a room where soap and hard water leave marks on everything.
Popular Bathroom Window Designs
1. Fixed Glass with Exhaust Fan Panel
The most common design. A frosted fixed glass panel lets in light, and a separate panel holds the exhaust fan. It is simple, watertight and needs almost no maintenance. Corinzo’s aluminium fixed glass windows are often used this way.
2. Small Sliding Window with Fan Cut-Out
A compact two-shutter sliding window sits beside or above the fan panel. You get natural ventilation on pleasant days and the fan for steam. This suits slightly larger bathrooms. See aluminium sliding windows.
3. Top-Hung or Openable Window with Fan
A hinged shutter that opens outward from the top lets air out even during light rain. Paired with a fan panel, it gives good airflow and a tight seal when closed. Corinzo’s aluminium openable windows work well here.
4. Louvered Window
Adjustable glass or aluminium louvers let air move while blocking the view. They are useful in bathrooms where ventilation matters more than light.
Common Bathroom Window Sizes
Every opening should be measured on site, but these are the sizes you will see most often in Indian homes:
| Bathroom Type | Typical Window Size (W x H) |
| Small toilet or powder room | About 1 ft 6 in x 1 ft 6 in to 2 ft x 1 ft 6 in |
| Standard attached bathroom | About 2 ft x 1 ft 6 in to 2 ft 6 in x 2 ft |
| Larger or master bathroom | About 3 ft x 2 ft or more |
Bathroom windows are usually placed high on the wall, often around 6 ft from the floor to the bottom of the window, so they give privacy without needing heavy frosting. Exhaust fans commonly come in 6, 8 and 9 inch sizes, so the fan panel must be made to suit the fan you plan to fit. Always check the fan size before the window is fabricated.
Choosing Glass for Privacy
- Frosted glass: the most popular choice. It lets light through but blurs shapes.
- Textured or patterned glass: similar privacy with a decorative look.
- Tinted or reflective glass: useful for bathrooms facing a neighbour’s window, though less effective at night with lights on.
- Toughened glass: a safer choice in any bathroom, especially low windows near a shower.
Getting the Exhaust Fan Right
The exhaust fan does most of the work of keeping a bathroom dry, so plan it carefully.
- Place it high. Steam rises, so the fan should sit near the top of the window or wall.
- Keep it away from the shower spray. Water should not hit the fan directly.
- Use a properly sized panel. The fan should fit snugly in its cut-out, with a sealed gap, so it does not vibrate or let rain in.
- Add a cowl or louvers outside. This stops rain blowing back in when the fan is off.
- Plan the wiring. Make sure a safe, waterproof power point is planned before the window goes in.
Keeping Water Out
Bathroom windows face moisture from inside and rain from outside. Silicone the frame to the wall all round, make sure the bottom of the frame has drainage holes on sliding designs, and slope the window sill outward so water runs away from the wall. A small chajja or weather shade above the window helps a lot during the monsoon.
Common Mistakes to Avoid
Making the window too small. A tiny opening with only a fan leaves the bathroom dark. A little extra glass makes a big difference to how fresh the room feels.
Fitting the fan in a thin sheet. A fan screwed into a flimsy panel hums and rattles. Ask for a proper fan panel made from a sturdy section.
Ignoring insects. Add a fine mesh behind openable shutters so mosquitoes cannot come in. Corinzo’s aluminium mesh windows can include this.
Forgetting cleaning access. Make sure you can reach both sides of the glass and the fan blades for cleaning.
Planning the Window During Construction
The easiest time to get a bathroom window right is before the walls are plastered. Decide on the window size, the fan size and the fan position with your fabricator early, so the mason leaves the correct opening and the electrician runs a waterproof point to the right spot. Ask for a small weather shade above the opening on the outside, and make sure the sill slopes away from the wall. If the bathroom shares a wall with a neighbour or a corridor, check where the exhaust air will go so it does not blow straight into someone else’s space.
Care and Cleaning
Wipe the frame and glass weekly with a mild soap solution to stop soap scum and hard-water marks building up. Clean the fan blades and grille every month or two, because dust and grease reduce airflow. Our guide on cleaning aluminium windows has more tips.
Final Word
A good bathroom window lets out steam, lets in light and keeps the room private, all in a small space. Pair a frosted glass panel with a properly fitted exhaust fan, seal the frame well, and add mesh where shutters open. If you are also replacing the door, see our guide to aluminium bathroom doors. To discuss your bathroom openings, contact the Corinzo team.
Frequently Asked Questions (FAQs)
1. What is the standard bathroom window size in India?
Common sizes range from about 1 ft 6 in x 1 ft 6 in for small toilets to around 2 ft 6 in x 2 ft for standard bathrooms. Always measure your opening.
2. Can an exhaust fan be fitted in an aluminium window?
Yes. A dedicated fan panel is built into the window to suit the fan size, usually 6, 8 or 9 inches.
3. Which glass is best for a bathroom window?
Frosted or textured glass gives privacy while letting light in. Toughened glass is safer near showers.
4. Should a bathroom window be sliding or fixed?
Fixed glass with a fan panel is simplest and most watertight. A small sliding or top-hung shutter adds natural ventilation.
5. How high should a bathroom window be placed?
It is usually placed high on the wall, often around 6 ft from the floor to the bottom of the window, for privacy.
6. How do I stop rain coming in through the exhaust fan?
Fit an outside cowl or louvers, seal the fan into its panel and keep a weather shade above the window.