UPVC vs Aluminium Windows: The Essential Guide

Choosing new windows? Two top materials dominate the market: UPVC and Aluminium. This quick guide explains what UPVC is and breaks down the key pros and cons to help you decide.

What Are UPVC Windows?

UPVC (Unplasticised Polyvinyl Chloride) is a strong, rigid plastic. Unlike regular PVC, it contains no softening plasticisers, making it durable and stable for construction. UPVC window profiles are multi-chambered. These hollow chambers trap air, providing excellent insulation against heat and sound.

UPVC vs Aluminium: The Key Comparison

Here’s a clear look at how they stack up.

1. Thermal Insulation & Energy Efficiency

UPVC: Excellent

The material itself is a natural insulator. Combined with its multi-chamber design, it provides a superior thermal barrier, keeping your home energy-efficient and reducing bills.

Aluminium: Good to Excellent

Aluminium naturally conducts heat. Standard frames can feel cold. However, modern thermally broken aluminium windows have a plastic barrier that cuts this heat transfer, offering performance close to UPVC.

2. Strength, Durability & Maintenance

UPVC: Durable & Low-Maintenance

Very strong, resistant to rot and corrosion. It requires almost no maintenance—just occasional cleaning. For very large window spans, its structural strength can be less than aluminium’s.

Aluminium: Extremely Strong

Stronger and more rigid than UPVC. It allows for larger glass panels with slimmer frames. It’s also low-maintenance and corrosion-resistant.

3. Aesthetics & Design

UPVC: Traditional & Practical

Available in many colours and wood-grain finishes. Frames are typically thicker, offering a more substantial look.

Aluminium: Sleek & Modern

The winner for a contemporary look. Frames can be much slimmer, maximising glass area and views. Offers a wide range of modern, powder-coated colours.

4. Cost

UPVC: More Affordable

Generally offers the best upfront value, balancing cost with strong performance.

Aluminium: Higher Investment

Typically more expensive, especially high-quality thermally broken systems. You pay for premium strength and aesthetics.

5. Environmental Impact

UPVC: Durable but Complex

Long-lasting and recyclable, but the recycling process is less established than for aluminium.

Aluminium: Highly Sustainable

Infinitely recyclable without quality loss. The recycling process is very efficient, making it a highly eco-friendly choice.

The Verdict: Which is Best for You?

Choose UPVC for: Top thermal efficiency, lowest cost, and minimal maintenance. It’s the practical, budget-friendly choice.

Choose Aluminium for: Modern aesthetics with slim frames, maximum strength for large windows, and a superior sustainable profile. It’s a premium, long-term investment.

There’s no single "best" material. Your ideal choice depends on your budget, style preferences, and performance needs for your home.