Old windows don’t always announce that they need replacing — the signs can be gradual. If you’re noticing draughts, sticking frames, or rising energy bills, it might be time to consider aluminium replacements. Here are the clearest signs it’s time to replace your old windows with aluminium.
1. Draughts and Air Leaks
If you can feel air moving around a closed window, the seals and frame have likely deteriorated beyond simple repair. Aluminium frames, properly fitted, create a much tighter seal than worn timber or old steel frames.
2. Difficulty Opening or Closing
Warped timber frames or corroded steel hardware often cause windows to stick, jam, or require excessive force to operate. This is both an inconvenience and, in some cases, a safety issue if the window can’t be used as an emergency exit.
3. Visible Rust or Corrosion
Steel window frames that show significant rust, especially around joints and hinges, are often more costly to repair than replace — particularly in Cape Town’s coastal air, where corrosion accelerates.
4. Rotting or Warped Timber
Timber frames that have started rotting, swelling, or warping are unlikely to seal properly again, and the problem generally worsens over time rather than improving.
5. Rising Energy Bills
Poorly sealed old windows let conditioned air escape, forcing heating or cooling systems to work harder. Upgrading to well-fitted aluminium frames with appropriate glazing can noticeably improve a home’s thermal performance.
6. Outdated or Mismatched Appearance
Sometimes the reason to replace windows isn’t functional at all — it’s simply that old frames no longer match a renovated or updated property. Aluminium offers a clean, modern look in a wide range of colours and finishes.
Why Aluminium Is a Strong Replacement Choice
Aluminium resists corrosion, requires minimal maintenance, and can be custom-fabricated to fit existing openings precisely — avoiding the need for major structural changes in most cases. To find out what a replacement would cost for your specific windows, request a free quote.
Why Choose Supar Steel
Supar Steel designs, fabricates, and installs aluminium window replacements across Cape Town. See our full range of welding and fabrication services to learn more.
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Frequently Asked Questions
Can aluminium windows fit existing openings without major renovation?
In most cases, yes — custom-fabricated aluminium frames can be measured and built to fit existing openings without significant structural changes.
Is it worth replacing just one or two windows, or should I do all at once?
Replacing the worst-affected windows first is a reasonable approach if budget is a concern, though doing all windows in one project can sometimes be more cost-effective per window.
How much can new windows improve energy efficiency?
The improvement depends on the current state of your old windows, but well-sealed aluminium frames with appropriate glazing can meaningfully reduce draughts and heat loss.
Window and glazing performance is a well-studied area of building science — you can read more on Wikipedia’s insulated glazing overview.
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Supar Steel offers a full range of welding, steel and aluminium fabrication services across Cape Town. Explore related guides and services:
