Choosing the right window frames is a key decision for any installation project. With energy efficiency targets rising, homeowners looking to cut energy bills and a growing demand for modern performance, installers are often asked to compare uPVC windows vs aluminium windows. Both materials offer strong benefits, and the right choice depends on the property type, budget and expected long-term performance.
At TWR Group, we fabricate and supply both Eurocell uPVC windows and a full range of aluminium windows, including Alitherm 600 and Alitherm Heritage. With more than two decades of industry experience, our expert team supports trade professionals with the technical insight needed to advise customers with confidence.
This guide breaks down the strengths and differences between uPVC and aluminium frames, covering thermal efficiency, strength, aesthetics, maintenance, costs and suitability for different homes.
Quick Comparison
| Feature | uPVC windows | Aluminium windows |
|---|---|---|
| Affordability | Budget-friendly | Higher initial cost |
| Thermal efficiency | Excellent, especially with multi-chambered profiles | Very high with thermal breaks |
| Strength | Good strength for most homes | Superior strength and slim sightlines |
| Aesthetic appeal | Wide variety of colours and styles | Modern look, minimalist appearance, slim frames |
| Maintenance | Very low maintenance | Minimal maintenance with powder coating |
| Durability | 20–25-year life span | Extremely long-life span with exceptional durability |
Why the choice of frame material matters
Windows play a major role in energy efficiency, long-term running costs, day-to-day comfort and the overall style of the home. The right material reduces heat loss, supports low energy bills and contributes to the home’s look inside and out. Installers who understand the practical differences between materials can guide customers toward the right choice, whether they want traditional sash windows, modern aluminium casement windows or versatile uPVC casement windows.
uPVC windows
TWR Group fabricates Eurocell uPVC windows, which are known for excellent thermal efficiency, secure construction and a wide range of colours.Key characteristics of uPVC windows:
- Multi-chambered uPVC frames help reduce heat loss
- Very low maintenance
- Strong value in the long run
- Suitable for a wide range of property styles
- Wide variety of colours including popular modern finishes
Aluminium windows
At TWR Group, we supply leading aluminium systems including Alitherm 600 and Alitherm Heritage, which offer outstanding thermal performance with advanced thermal breaks. Key characteristics of aluminium windows:
- Slim sightlines that increase natural light
- Powder coating for long-term colour stability
- Exceptional durability suited to demanding environments
- Premium finish popular for modern homes and architectural builds
uPVC windows vs aluminium windows: what should installers compare?
Below is a detailed comparison to help installers advise customers with accuracy and confidence.
How do the materials compare for strength?
uPVC strength
uPVC is a durable material that performs well for most standard domestic applications. Reinforced uPVC window frames provide reliable structural strength and stability, suitable for casement windows, tilt-and-turn styles and sash windows.
Aluminium strength
Aluminium is a highly durable material that outperforms many alternatives. Its natural rigidity allows for thinner aluminium frames and larger panes of glass. This creates slim sightlines and a contemporary look while maintaining exceptional durability. It’s best for large window openings, modern homes and projects needing strong, slim frames
Which offers better thermal efficiency?
uPVC thermal efficiency
uPVC windows are widely recognised for excellent thermal efficiency. Eurocell frames are designed with multi-chambered profiles that minimise heat loss and support low U-values. When paired with double glazing or triple glazing, uPVC offers strong thermal performance suitable for meeting Part L requirements.
Aluminium thermal efficiency
Modern aluminium windows now offer excellent thermal efficiency thanks to advanced thermal breaks, which prevent heat transfer through the frame. Systems like Alitherm 600 achieve high performance levels that compete with and often exceed traditional expectations of aluminium.
The Energy Savings Trust reports that installing energy-efficient windows can reduce heat loss by up to 75% depending on property type, showing the value of investing in high-performing glazing systems.
Maintenance: which material is easier to look after?
uPVC maintenance
uPVC windows are extremely low maintenance. Most frames only require cleaning with warm soapy water a few times a year to keep them looking fresh.
Aluminium maintenance
Aluminium frames require minimal maintenance. Powder coating creates a durable finish that resists peeling and fading. Like uPVC, they need only occasional cleaning with warm soapy water.
Aesthetics of aluminium and uPVC: which looks better?
uPVC design
Modern uPVC windows come in a wide variety of colours and finishes. Eurocell offers a broad range of colours including popular modern greys and woodgrain finishes. This makes uPVC suitable for both traditional homes and newer builds.
Aluminium design
Aluminium windows are known for a minimalist appearance and slim sightlines. Powder-coated aluminium is available in almost any RAL colour, allowing installers to offer customers something highly bespoke. The aesthetics of aluminium often appeal to homeowners seeking a clean, contemporary finish.
Alitherm Heritage is especially popular in period properties where slim profiles replicate steel-look windows.
Cost considerations: which is more affordable?
uPVC cost
uPVC is typically the most cost-effective option. Installers working with budget-conscious customers or landlords often choose uPVC because it provides long-term value at a competitive price.
Aluminium cost
Aluminium windows have a higher upfront cost due to material strength, precision manufacturing and premium design options. However, their long lifespan and exceptional durability can make them cost-effective in the long run.
Customers investing in aluminium often prioritise longevity, style and property value rather than lowest initial cost.
Which material suits different homes?
Best for modern homes
Aluminium windows and aluminium doors often suit contemporary homes thanks to slim sightlines, large glazed areas and modern aesthetics.
Best for period properties
Alitherm Heritage is ideal for renovations where steel-look windows are needed. uPVC can also work well for traditional homes seeking cost-effective upgrade options.
Best for budget-focused projects
uPVC is the right choice for customers looking for reliable, energy-efficient new windows without premium pricing.
Are uPVC windows better for energy efficiency?
Yes, uPVC frames generally offer excellent thermal efficiency thanks to multi-chambered profiles. Aluminium windows with thermal breaks can be equally strong in thermal performance, but uPVC still holds a slight advantage in many typical residential installations.
Long-term performance and lifespan
uPVC windows: Typically last 20–25 years with minimal maintenance.
Aluminium windows: Often exceed 30 years due to exceptional durability and resistance to corrosion.
For customers planning to stay in a property for a long time, both materials offer strong long-term value.
Which is the right choice for your customer?
The right choice depends on homeowner priorities. Recommend uPVC windows when cost is a key factor, high energy efficiency is required, and minimal maintenance is important.
Recommend aluminium windows when slim sightlines or a premium finish is desired, large openings or modern architectural designs are specified, and a highly durable material is preferred.
TWR Group’s uPVC and aluminium windows
All our windows are fabricated in house at our new state-of-the-art Sunderland facility. Our uPVC windows offer excellent thermal efficiency, strong and secure frames, a range of styles and a wide variety of colours, and reliable performance for many years.
Our aluminium windows offer slim, modern aluminium window frames, advanced thermal breaks for strong energy efficiency, premium powder-coated finishes in RAL colours, and exceptional durability for modern and heritage applications
Ready to choose the right windows?
TWR Group supplies high-quality Eurocell uPVC windows and premium aluminium systems for trade professionals across the UK. Whether your next project requires cost-effective uPVC or modern aluminium windows, our expert team can help you make the right choice for your customers.
Contact TWR Group today to discuss your next window project and speak with our technical specialists.
FAQs
Are aluminium windows more durable than uPVC?
Yes. Aluminium provides exceptional durability and is often chosen for long-term performance.
Do uPVC windows offer good thermal performance?
Yes. Eurocell uPVC frames provide excellent thermal efficiency and help reduce heat loss.
Are aluminium windows worth the extra cost?
For homeowners wanting slim frames, modern styling and a long-life span, aluminium is a strong investment.