Window Design for Home: Types, Sizes and Materials

Windows decide how a home feels at every hour: how much morning light reaches the kitchen, whether the bedroom stays cool in the afternoon, how much traffic noise comes in at night and whether a breeze moves through the house during the monsoon.

In Bangalore, with its mild climate, good windows can make fans enough for most of the year. Badly placed or badly sized windows make rooms dark, hot or noisy no matter how good the rest of the interior is.

This guide covers the main window types, the right sizes and placement, materials, glass, grills and mesh, and what windows cost in 2026.

Casement windows

Casement windows are hinged at the side and open outward like a door. They open fully, catch breezes and seal tightly when closed.

They suit bedrooms, living rooms and kitchens. Make sure the open sash does not hit a balcony railing, a neighbouring wall or a sunshade.

Sliding windows

Sliding windows have sashes that slide sideways on tracks. They do not project when open, which suits balconies, passages and rooms facing narrow gaps.

Only half the window opens at a time, so they ventilate less than casements of the same size. Tracks also need regular cleaning in Bangalore's dust.

Fixed windows

Fixed windows do not open. They bring in light and views where ventilation is not needed, such as beside a staircase or above a door. They are often combined with opening sashes.

Bay windows

Bay windows project outward from the wall, usually with glass on three sides. Inside, the projection becomes a seat, a reading nook or extra floor space.

They suit living rooms and bedrooms in independent houses. In apartments, they are usually built by the developer and can be fitted with a cushioned seat and storage below.

French windows

French windows are tall, door-like windows that reach the floor, often opening onto a small balcony. They flood a room with light and connect it to the outside.

They need safety glass and, on upper floors, a railing.

Top-hung, awning and louvered windows

Top-hung or awning windows are hinged at the top and open outward from the bottom. They let air in while keeping rain out, which suits Bangalore's monsoon.

Louvered windows have horizontal glass or aluminium slats that tilt open. They suit bathrooms and utility areas, where ventilation and privacy matter.

Ventilators

Small high-level windows above doors or near the ceiling let hot air escape. They are useful in bathrooms, kitchens and staircases.

Window sizes and placement

A useful rule is that window area should be at least one-eighth to one-sixth of the floor area of a habitable room, for adequate daylight. A 12 by 12-foot bedroom, about 144 sq ft, needs roughly 18 to 24 sq ft of window.

Sill height is usually 2.5 to 3 feet from the floor in living rooms and bedrooms, so furniture can sit below. Kitchen windows sit above the counter, at about 3.5 to 4 feet. Bathroom windows sit high, at 5 to 6 feet, for privacy.

Place windows on two walls of a room where possible. Cross ventilation keeps a room fresh far better than one large window.

Windows and Bangalore's climate

East-facing windows bring pleasant morning light. North-facing windows give soft, even light all day, ideal for studies and studios.

West-facing windows get strong afternoon sun and heat. Use smaller windows, deep sunshades, vertical fins or solar control glass on the west.

South-facing windows get sun for much of the day in winter. A horizontal sunshade blocks the high summer sun but lets in the lower winter sun.

Materials for window frames

Wooden frames look warm and suit traditional homes, but need polishing and can swell or attract termites.

uPVC frames insulate well against heat and noise, need little maintenance and seal tightly.

Aluminium frames are strong and slim, suit large windows and come in many colours.

Steel frames are strong and slim but can rust if not maintained.

Glass

Clear glass suits most windows. Frosted or textured glass gives privacy in bathrooms and street-facing rooms.

Toughened glass is safer for large panes and low windows.

Laminated glass reduces noise and holds together if broken.

Double glazing gives the best insulation against heat and noise.

Grills, mesh and curtains

Plan grills, mosquito mesh and curtain tracks with the window. Grills can be fixed outside the frame, and mesh shutters can slide or fold in matching frames.

Leave space above the window for a curtain rod or blind, and make sure curtains can be drawn clear of the glass.

Kitchen windows

A window over the sink or counter brings daylight to the work area and lets cooking smells escape. Keep it away from the hob, where wind can blow out flames.

Use a top-hung or casement window with mesh, and an easy-to-clean frame. Avoid deep sills behind the sink where water collects, and choose a frame colour that does not show grease, since kitchen windows are wiped more often than any other.

What windows cost

In 2026, uPVC sliding windows cost about Rs 450 to Rs 800 per sq ft installed in Bangalore, and casement windows Rs 550 to Rs 1,000. Standard aluminium sliding windows cost Rs 350 to Rs 700 per sq ft. Wooden windows cost Rs 600 to Rs 1,500 per sq ft depending on the wood. Window grills in powder-coated MS cost Rs 180 to Rs 350 per sq ft. A standard 4 by 4-foot bedroom window costs roughly Rs 7,000 to Rs 16,000 in uPVC.