Fixed vs opening windows: the key facts, in plain language.
Not every window needs to open. Choosing between fixed windows and opening windows — and often combining the two — is about balancing light, view, ventilation, cost and security. This guide explains when each makes sense, using Coetz™ made-to-order aluminium windows.
Quick comparison
| Feature | Fixed Windows | Opening Windows |
|---|---|---|
| Ventilation | None — the pane is sealed | Yes — airflow you can control |
| Light & view | Maximum — no frame for a sash | Excellent, with a sash frame |
| Sealing & security | Best — nothing to open | Very good with quality hardware |
| Cost | Lower — no opening hardware | Slightly higher — hinges and handles |
| Cleaning (outside) | From outside only | Sash can open for access |
| Best for | Picture views, stairwells, high panes | Bedrooms, kitchens, living areas |
Ventilation vs a sealed pane
Opening windows — typically top-hung on Coetz™ ranges — give you controllable fresh air and are essential in bedrooms, kitchens and living areas. Fixed windows don’t open at all, so they offer no ventilation but seal tighter and cost less. Many homes use a smart mix: large fixed panes for light and view, with opening sections where airflow is needed.
Light, view & security
Because a fixed window has no opening sash, it can hold a large, uninterrupted pane — maximising light and framing a view — and it’s inherently secure since there’s nothing to force open. Opening windows still offer excellent light and, with quality aluminium hardware and 6.38 mm laminated safety glass, remain very secure while giving you ventilation.
Cost & where each works best
Fixed windows are more affordable per square metre because they use no opening hardware — ideal for stairwell glazing, high clerestory panes and picture windows. Opening windows cost a little more for the hinges and handles but are indispensable wherever you need air. Combining fixed and opening sections in one design gives you the best of both.
Advantages of fixed windows
- Maximum glass, light and uninterrupted views
- Tightest weather seal
- Inherently secure — nothing to open
- Lower cost per square metre
- Great for stairwells, high panes and picture windows
Advantages of opening windows
- Controllable ventilation and fresh air
- Essential for bedrooms, kitchens and living spaces
- Easy access to clean the outer glass
- Top-hung options shed rain well
- Available across the Coetz™ made-to-order range
Which should you choose?
- Best for maximum light and view: fixed.
- Best for ventilation: opening.
- Best for stairwells and high panes: fixed.
- Best for bedrooms and kitchens: opening.
- Best overall: combine fixed panes with opening sections.
Coetz™ supplies both fixed and opening aluminium windows, made to order in standard sizes and five colours, glazed with 6.38 mm clear laminated safety glass. Send us your requirements for a no-obligation quotation.
What is the difference between a fixed and an opening window?
A fixed window is sealed and does not open, giving maximum glass and the tightest seal. An opening window has a sash (usually top-hung on Coetz™ ranges) that opens for ventilation.
Are fixed windows cheaper than opening windows?
Usually yes, because fixed windows have no hinges or handles. Opening windows cost a little more for the operating hardware but provide ventilation.
Can I combine fixed and opening windows?
Absolutely — it is very common. Large fixed panes give light and view while opening sections provide airflow where you need it, all in one made-to-order unit.
Are fixed windows more secure?
A fixed window has nothing to open, so it is inherently secure. Coetz™ opening windows are also very secure with quality aluminium hardware and 6.38 mm laminated safety glass.
Shop & related
Aluminium Windows
Fixed and opening aluminium windows, made to order.
Fixed Vs Opening Windows
Coetz Glazing manufactures to your sizes and supplies direct — send us your sizes for a fixed-price quote.
Still weighing up fixed vs opening windows? Call 010 412 0062 or WhatsApp 076 613 4418 and our team will talk it through. Send us your opening sizes and how the space is used, and we will tell you how fixed vs opening windows works out for your project.
Our team can price both options in fixed vs opening windows for your openings, so you compare real figures. Every point in this guide to fixed vs opening windows reflects South African conditions and building practice.
Top Hung Windows
Coetz™’s core opening window range.
Helpful next steps: How to Measure Aluminium Windows · Window Energy Efficiency · Warranty.
Planning a big window: see large aluminium windows.
