If you're comparing uPVC vs aluminium double glazed windows, the glass is only half the story — the window frame material plays a major role in comfort, energy efficiency, condensation control, and long-term performance.
uPVC and aluminium are the two most common frame options for double glazed windows in Melbourne. Here is a practical, no-nonsense comparison to help you understand which frame works best for your home.
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uPVC outperforms aluminium on thermal efficiency, condensation resistance, maintenance, lifespan, and coastal durability. Aluminium earns its place in contemporary architecture where slim, modern sightlines are the priority.
Get a Free Quote →uPVC vs Aluminium Double Glazed Windows — Quick Comparison
Here is how both frames compare across every factor that matters for Melbourne homeowners.
| Feature | uPVC Double Glazed | Aluminium Double Glazed | Winner |
|---|---|---|---|
| Frame U-value (Uf) | 1.5 – 2.5 W/m²K | 2.5 – 7.0 W/m²K * | uPVC |
| Thermal conductivity | 0.15 W/m·K | 160 – 200 W/m·K | uPVC |
| Condensation resistance | Excellent | Good (thermal break needed) | uPVC |
| Noise reduction | Excellent | Good — less dense material | uPVC |
| Maintenance | None — no painting or sealing | Low — periodic cleaning | uPVC |
| Lifespan | 30+ years (quality uPVC) | Varies by specification | uPVC |
| Slim sightlines / aesthetics | Standard profiles | Slimmer, architectural look | Aluminium |
| Coastal suitability | Excellent — no corrosion risk | Subject to corrosion without anodised finish | uPVC |
| Installed cost per window | $1,800 – $3,500+ | Similar range, varies by spec | Comparable |
| Energy bill savings | Higher (superior insulation) | Good (thermal break required) | uPVC |
* Aluminium without thermal break: 5.5–7.0 W/m²K. Thermally broken aluminium: 2.5–4.0 W/m²K.
1 Thermal performance of double glazed windows
The purpose of double glazed windows is to reduce heat transfer and improve indoor comfort. The frame can either support that benefit or undermine it.
uPVC frames
- Naturally insulating — thermal conductivity of just 0.15 W/m·K
- Support consistent thermal comfort alongside an insulated glass unit (IGU)
- Help reduce heat loss in winter and heat gain in summer
Aluminium frames
- Very strong but naturally conductive — over 1,000 times more than uPVC
- Require thermal break technology to perform at a comparable level
Takeaway: When comparing uPVC vs aluminium double glazed windows on thermal performance alone, uPVC is the clear winner. Aluminium with a quality thermal break can still achieve good results, but uPVC maintains the edge in frame U-value (1.5–2.5 vs 2.5–4.0 W/m²K).
Which frame suits Melbourne's climate?
Melbourne's weather creates one of Australia's most demanding thermal environments — cold, damp winters and scorching summer heatwaves, sometimes within the same week.
At 0.15 W/m·K thermal conductivity, a uPVC frame barely conducts any heat at all — the frame stays close to room temperature on a 5°C Melbourne winter night rather than acting as a cold bridge. For most Melbourne homes without extreme architectural requirements, uPVC delivers the strongest year-round thermal performance.
2 Condensation and moisture control
Condensation forms when warm indoor air meets a cold surface.
- uPVC frames stay warmer internally, significantly reducing condensation risk
- Aluminium frames can be considerably colder without a thermal break, increasing condensation on frames and surrounding walls
Result: uPVC consistently outperforms aluminium for condensation control in Melbourne's residential settings — particularly important in winter.
3 Noise reduction
While glazing does most of the acoustic work, the frame material and its density play a meaningful role in how well sound is blocked at the frame.
- uPVC is a denser, less resonant material — it absorbs and dampens sound rather than transmitting it, and supports tighter multi-chamber seals
- Aluminium is a harder, less dense metal that can transmit vibration more readily, even with quality gaskets and sealing
Result: uPVC holds a genuine advantage for noise reduction. For maximum acoustic performance, specify acoustic laminated glass in a uPVC frame — this combination delivers the strongest results for Melbourne homes near traffic, trams, or flight paths.
4 Design, strength, and appearance
- Aluminium allows slimmer, more modern profiles — preferred for architectural and contemporary homes
- uPVC provides slightly wider frames but excellent structural stability
- Both are available in a range of colours and finishes
- Both work well in standard residential applications
Design rule: Aluminium suits architectural aesthetics and slimline glazing. uPVC suits energy-efficient comfort and lower-maintenance family homes.
5 Maintenance and lifespan
Both frame types are low-maintenance compared to timber — but they differ in longevity and care requirements.
| Feature | uPVC | Aluminium |
|---|---|---|
| Painting required | Never | No |
| Sealing / re-finishing | Never | Rare |
| Corrosion risk | Very low | Low with correct anodised finish |
| UV degradation | Low (quality uPVC) | Minimal |
| Typical lifespan | 30+ years (quality systems) | Varies by specification |
Quality uPVC systems are designed for long-term durability with zero refinishing required — no painting, no sealing, no re-finishing over the entire lifespan. uPVC is also completely inert, meaning it will not corrode, rust, or degrade from salt air — making it an excellent choice for coastal and bayside Melbourne properties.
6 Value and performance
Many Melbourne homeowners choose uPVC double glazed windows for the balance of:
- Superior thermal insulation — lower heating and cooling bills
- Zero ongoing maintenance — no painting, sealing, or re-finishing
- Strong condensation resistance — better indoor air quality
- Reliable long-term comfort across Melbourne's full temperature range
Aluminium remains the preferred choice for contemporary architecture, slim sightlines, and projects where design aesthetics are the primary driver.
uPVC double glazed windows — 2026 pricing guide
Prices below are for uPVC double glazed windows fully installed in Melbourne, including timber reveals, sealing, hardware, and removal of existing windows. All figures are from Windows Republic's current pricing.
uPVC Double Glazed
- Includes timber reveals & sealing
- Zero painting or maintenance
- Best thermal performance
- Manufactured locally in Cheltenham
Aluminium Double Glazed
- Thermal break required for energy performance
- Slimmer profiles available
- Slim sightlines for architectural designs
- Preferred for modern/coastal homes
uPVC pricing by window type — Melbourne (2026)
| Window Type | Installed Cost Range | Includes |
|---|---|---|
| Fixed (non-opening) | $1,800 – $2,400 | Reveals, sealing, disposal |
| Awning | $2,200 – $2,800 | Reveals, sealing, hardware |
| Casement | $2,300 – $3,000 | Reveals, sealing, hardware |
| Sliding | $2,200 – $2,900 | Reveals, sealing, track |
| Tilt & Turn | $2,600 – $3,400 | Reveals, sealing, Siegenia hardware |
| Sliding Door | $3,500 – $4,500 | Full installation, track, hardware |
| Whole home (typical) | $15,000 – $40,000+ | Depends on window count & complexity |
Prices are indicative. Final cost depends on window sizes, glass specification (standard, Low-E, acoustic laminate), building complexity, and access requirements. Request a free measure and quote for an accurate figure for your home.
Both uPVC and aluminium double glazed windows are eligible for a discount under Victoria's Victorian Energy Upgrades (VEU) program — we're preparing a complete guide to VEU rebates for double glazing with a full breakdown of how the scheme works and what you can realistically expect.
The most important point
Whether you choose uPVC or aluminium, the biggest performance gains come from four things:
✔ Proper glazing selection — glass type, thickness, and air gap
✔ Quality seals — airtight installation that holds over time
✔ Premium hardware — we use Siegenia German-engineered hardware on all our systems for long-term reliability
✔ Professional installation — the frame and glass are only as good as the install
Whether you choose uPVC vs aluminium double glazed windows, the complete window system — frame, glass, hardware, seals, and installation — is what ultimately determines comfort, energy savings, and longevity in your Melbourne home.
Not sure which frame is right for your home?
We'll assess your home's orientation, noise exposure, and budget — and recommend the best combination of frame and glass for your specific situation.
Request a Free CallbackFrequently Asked Questions
For most Melbourne homes, uPVC double glazed windows offer better thermal performance, lower maintenance, and stronger condensation resistance. Aluminium is preferred for modern architectural homes where slim sightlines and long-term durability are priorities. The right choice depends on your home's orientation, design, and performance goals.
Yes — for aluminium to perform well thermally, a thermal break is essential. Without one, the aluminium frame conducts heat over 1,000 times more readily than uPVC, significantly undermining the double glazing's energy efficiency. Always specify thermally broken aluminium for energy-conscious projects.
No — uPVC condensates less. Because uPVC frames have very low thermal conductivity, the frame surface stays warmer internally, well above the dew point even on cold Melbourne nights. Aluminium frames (especially without a thermal break) can be significantly colder, increasing condensation risk on frames and nearby walls.
uPVC saves more energy in most residential applications. Its frame U-value of 1.5–2.5 W/m²K outperforms thermally broken aluminium (2.5–4.0 W/m²K) and is dramatically better than non-thermally-broken aluminium (5.5–7.0 W/m²K). For Melbourne's cold winters and hot summers, the difference translates to measurably lower heating and cooling costs over time.
uPVC holds a genuine advantage for noise reduction. uPVC is a denser, less resonant material that absorbs and dampens sound rather than transmitting it, and its multi-chamber frames support tighter seals. Aluminium is a harder metal that can transmit vibration more readily. For maximum acoustic performance, specify acoustic laminated glass in a uPVC frame.
uPVC double glazed windows in Melbourne typically cost $2,300–$3,500+ per window fully installed, including timber reveals, sealing, hardware, and removal of the existing window. Fixed (non-opening) windows start from around $1,800, while tilt & turn and sliding doors range from $2,600 to $4,500+. A whole-home replacement typically costs $15,000–$40,000+ depending on window count and building complexity. See our full 2026 pricing guide for detailed breakdowns.
Yes — both uPVC and aluminium double glazed windows are eligible for an upfront discount under the Victorian Energy Upgrades (VEU) program. The discount is calculated based on the area of glazing replaced and applied at point of sale by a VEU-accredited installer. We're preparing a complete VEU guide with a detailed breakdown of how the scheme works, what to expect, and how to find an accredited installer.
Quality uPVC double glazed windows last 30+ years with zero maintenance — no painting, no sealing, and no re-finishing required over their entire lifespan. uPVC is also completely inert, so it will not corrode, rust, or degrade from salt air, UV exposure, or moisture. The key is choosing a quality uPVC system with proven hardware — we use Siegenia German-engineered hardware on all our systems for long-term reliability.
Yes — uPVC is an excellent choice for coastal and bayside Melbourne properties. Unlike aluminium, which requires an anodised finish to resist salt air corrosion, uPVC is completely inert — it cannot corrode, rust, or degrade from salt exposure. This makes uPVC the clear winner for homes in areas like Brighton, Williamstown, the Bellarine Peninsula, and the Mornington Peninsula.
uPVC window frames achieve a frame U-value (Uf) of 1.5–2.5 W/m²K, while thermally broken aluminium frames range from 2.5–4.0 W/m²K. Standard aluminium without a thermal break is significantly worse at 5.5–7.0 W/m²K. The lower the U-value, the better the insulation — so uPVC outperforms aluminium in every configuration. This is because uPVC has a thermal conductivity of just 0.15 W/m·K compared to aluminium at 160–200 W/m·K — over 1,000 times the difference.
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