When it comes to new windows for Australian homes, the two most popular frame materials are aluminium and uPVC (unplasticised polyvinyl chloride). Both have their merits — but for Melbourne homes, one consistently outperforms the other in the ways that matter most.
Here’s an honest, side-by-side comparison from a manufacturer who works with both materials every day.
What is uPVC?
uPVC is a rigid plastic used widely in European windows since the 1970s. It’s a good insulator, resistant to rot, and requires little maintenance. In the UK and Europe, uPVC dominates the residential window market.
In Australia, however, aluminium has remained the material of choice for over 50 years — and for good reason.
Aluminium vs uPVC: The Full Comparison
| Feature | Aluminium | uPVC |
|---|---|---|
| Strength & durability | ⭐⭐⭐⭐⭐ Extremely strong | ⭐⭐⭐ Good, but can warp |
| Thermal performance | ⭐⭐⭐⭐ Excellent (thermally broken) | ⭐⭐⭐⭐ Good |
| Slim sight lines | ⭐⭐⭐⭐⭐ Very slim, modern look | ⭐⭐ Bulky frames |
| UV & heat resistance | ⭐⭐⭐⭐⭐ Excellent | ⭐⭐ Can discolour & warp |
| Colour options | ⭐⭐⭐⭐⭐ Powder coat any colour | ⭐⭐ Limited (mainly white) |
| Large openings | ⭐⭐⭐⭐⭐ Handles large spans | ⭐⭐ Needs reinforcing |
| Recyclability | ⭐⭐⭐⭐⭐ 100% recyclable | ⭐ Difficult to recycle |
| Maintenance | ⭐⭐⭐⭐⭐ Near-zero | ⭐⭐⭐⭐ Low |
| Cost | ⭐⭐⭐⭐ Competitive | ⭐⭐⭐ Similar range |
Why Aluminium Wins in Melbourne’s Climate
1. Heat and UV Resistance
Melbourne summers regularly hit 38–43°C. uPVC can soften, warp and discolour under sustained Australian heat and UV exposure — a well-documented issue that European manufacturers didn’t design for. Aluminium is completely unaffected by heat, UV or direct sunlight, maintaining its structural integrity and appearance for decades.
2. Slim, Modern Sight Lines
Aluminium’s strength allows for much slimmer frame profiles than uPVC. This matters significantly in modern Melbourne architecture, where floor-to-ceiling windows, large sliding doors and minimal-frame aesthetics are standard. uPVC frames are typically 30–50% bulkier, which reduces glass area and creates a dated, heavy look.
3. Large Format Windows and Doors
For large openings — bi-folding doors, stacker doors, wide sliding windows — aluminium is the only practical choice. uPVC requires steel reinforcement inside the frame for large spans, adding weight and cost. Aluminium handles these applications naturally and is the material used in all commercial and high-end residential projects.
4. Powder Coat Colours
uPVC is available in a limited range of colours — mostly white, cream and a handful of woodgrain foils that can peel over time. Aluminium can be powder coated in virtually any colour from the Dulux or Interpon range — including custom colours to match your home’s exterior. This flexibility is essential for both new builds and renovations.
5. Environmental Impact
Aluminium is one of the most recyclable materials on earth — approximately 75% of all aluminium ever produced is still in use today. uPVC is significantly harder to recycle and often ends up in landfill at end of life. For environmentally conscious homeowners, aluminium is the clear choice.
The One Area Where uPVC Has an Edge — And How Aluminium Closes the Gap
Historically, standard aluminium frames conducted heat and cold through the frame — giving uPVC a thermal advantage. However, thermally broken aluminium eliminates this difference entirely.
Thermally broken frames incorporate a polyamide thermal barrier inside the frame, stopping heat transfer. Combined with double or triple glazing, thermally broken aluminium windows match or exceed uPVC thermal performance — while retaining all the aesthetic and durability advantages of aluminium.
All of Iconic Windows’ double glazed products are available with thermally broken frames.
Which Should You Choose?
Choose aluminium if you want:
- A modern, minimal aesthetic with slim sightlines
- Large windows, bi-folds, or stacker doors
- Custom colours to match your home
- Long-term durability in Melbourne’s heat
- An environmentally responsible choice
uPVC might suit you if:
- You’re on a tight budget and replacing small standard-size windows only
- You specifically need a white frame and white is the only colour you’ll ever want
For the vast majority of Melbourne homes — particularly new builds, renovations and any project involving large openings or custom finishes — aluminium is the better long-term investment.
Get a Free Design Consultation from Iconic Windows
Iconic Windows manufactures custom aluminium windows and doors at our Mulgrave factory, supplying and installing across Melbourne. We offer a free quote and design consultation — including a review of your plans or existing windows to recommend the right product for your project.
Call us on 0468 886 377 or submit your project details online.
