Which is better, aluminium or uPVC windows?
  • NexGen Windows

    Which is better, aluminium or uPVC windows?

    The short answer: neither material wins outright. Aluminium suits homeowners who want slim frames, a sharp contemporary look and a longer lifespan. uPVC suits those who want a lower upfront cost, excellent thermal performance and minimal day-to-day upkeep. The right choice depends on your property, your budget and the style you want to achieve.
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Read on and we'll break down exactly how each material performs across the areas that matter most.
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What are aluminium windows?

Aluminium windows use a lightweight metal frame, typically finished with a powder-coated paint that resists corrosion and fading. The frames are structurally strong, which means they can be made much slimmer than uPVC equivalents without losing rigidity. That slimmer profile allows more glass in the frame, which improves natural light and gives the window a clean, architectural look.

Key characteristics of aluminium windows:

  • Slim sightlines and a contemporary finish
  • Powder-coated colours that do not fade or peel
  • Exceptionally strong and resistant to warping
  • High recyclability at end of life
  • Typically 10–15% more expensive than uPVC at the point of purchase
Aluminium is a naturally conductive material, which historically made it a poor insulator. Modern aluminium frames overcome this with a thermal break, a layer of insulating material running through the centre of the frame that prevents cold from transferring through to the inside of your home.

How long do aluminium windows last?

With proper care, aluminium windows typically last 45 years or more. The powder-coat finish is highly resistant to UV exposure, salt air and general weathering, which means the frames hold their colour and shape for decades with very little intervention.

That longevity makes aluminium a strong long-term investment, even if the upfront cost is higher than uPVC.

What are uPVC windows?

uPVC stands for unplasticised polyvinyl chloride. It is the most widely fitted window material in the UK and has been for several decades. The frames are manufactured by extruding the material into a profile with multiple internal chambers. Those chambers trap air and act as natural insulation, which is one of the reasons uPVC performs so well on energy efficiency.

Key characteristics of uPVC windows:

  • Multi-chamber profile for strong thermal performance
  • Lower cost than aluminium at point of supply and installation
  • Wide choice of styles, colours and woodgrain foils
  • Will not rot, warp or corrode
  • Fully recyclable at end of life

uPVC frames are wider than aluminium frames, which reduces the glass area slightly. For most standard home windows this is not noticeable, though it is worth considering for large picture windows or bi-fold openings where sightlines are a priority.

How long do uPVC windows last?

A well-made uPVC window will last between 20 and 35 years in most UK conditions. Cheaper uPVC can discolour or become brittle over time, particularly in prolonged direct sunlight, so material quality at the point of manufacture matters. A reputable installer fitting a quality profile will give you a window that stays looking good and performing well for the long term.

At NexGen Windows, all our uPVC and aluminium windows come with a 10-year guarantee as standard.

Which material is right for your home?

Use this as a starting point:

Choose aluminium if you:

  • Want slim sightlines and a contemporary architectural look
  • Are fitting large glazed areas, bi-folds or sliding doors
  • Plan to stay in the property long-term and want a window that outlasts a single mortgage
  • Want the widest colour choice without foil

Choose uPVC if you:

  • Want the best upfront value for money
  • Need to match existing uPVC frames on a partial replacement project
  • Want excellent energy efficiency without a premium price
  • Have a traditional property and want a woodgrain finish

Our team at NexGen works with homeowners across Swindon, Marlborough, Chippenham, Cirencester and the surrounding area. We supply and install both casement windows and flush windows in uPVC and aluminium, so we can show you samples of both materials and help you decide what works for your property.

Frequently asked questions

Is aluminium better than uPVC?

Aluminium is not categorically better than uPVC; it depends on what you are asking it to do. Aluminium outperforms uPVC on frame lifespan, slim sightlines and the range of available colours. uPVC outperforms aluminium on upfront cost and, without a thermal break, on natural insulation. For most UK homes, a quality uPVC window meets every performance requirement. If you want the aesthetic benefits of slimmer frames or are fitting a large glazed opening, aluminium is likely the better material.

Do aluminium windows last longer than uPVC?

Yes. Aluminium windows typically last 45 years or more, compared to 20–35 years for uPVC. The powder-coated finish on aluminium resists fading, salt air and UV far better than even high-quality uPVC profiles over very long periods. That said, both materials will outlast their glazing units, which typically need replacing after 20–25 years regardless of frame type.

Is uPVC cheaper than aluminium?

In most cases, yes. uPVC windows cost less to manufacture and install than aluminium, typically by 15–30% per unit. Over the full lifespan of the window, the gap narrows because aluminium lasts considerably longer. If budget is the primary consideration and you are replacing windows in a standard family home, uPVC offers the strongest value for money at the point of purchase.

Which window material requires less maintenance?

uPVC requires the least maintenance overall. There is nothing to paint or treat, and a regular wipe-down is all that is needed to keep the frames in good condition. Aluminium is a close second; the powder-coat finish is extremely durable and does not require repainting. Both materials demand far less upkeep than painted timber windows.

Contact our team for a free, no-obligation quote or call us on 01793 977 030.

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Nexgen Windows Limited is an Introducer Appointed Representative (Financial Services Register No. 936655) of Phoenix Financial Consultants Limited (Phoenix). Phoenix is a credit broker, not a lender. Phoenix is authorised and regulated by the Financial Conduct Authority (FRN: 539195), and offers finance from its panel of lenders. All finance subject to status and credit checks.