UPVC vs aluminium windows: Which is right for your home?

For homeowners ready to install or replace windows, the decision between uPVC vs aluminium windows is often challenging. Each material brings unique benefits, from insulation and durability to style and cost-effectiveness, so it’s no surprise that choosing between the two can be difficult.

In this guide, we’ll discuss the pros and cons of these two popular types of windows. This will help you choose the ideal material to enhance your home’s comfort and appearance.

What are uPVC windows? 

White-framed uPVC window with a view of urban architecture. (Source: iStock)

uPVC windows are a type of window made from unplasticised polyvinyl chloride. They’re popular in residential settings for their strength, weather resistance, and low maintenance needs. And with low thermal conductivity, they also offer excellent insulation. You can even upgrade your uPVC windows to double glazing to further reduce heat transfer and lower your energy bills.

Additionally, these uPVC window frames resist rot, corrosion, termites, and fading, making them a reliable choice in various climates.

What are aluminium windows? 

Modern aluminium window with secure locking hardware. (Source: iStock)

Aluminium windows are made from lightweight, strong metal frames, often powder-coated for colour customisation and added protection. Known for their sleek and modern look, aluminium window frames can hold large glass panels without bulk. This makes them ideal for contemporary designs that favour slim frames and expansive views. 

There are also aluminium double-glazed windows that improve energy efficiency. Their structural strength even allows options like triple-glazing.

For insulation, modern aluminium window frames often include thermal breaks. And since these windows offer durability with minimal corrosion, they’re common in both homes and commercial buildings. 

Aluminium vs uPVC windows: Which is the better investment?

Before deciding, it’s crucial to weigh the energy efficiency, aesthetics, maintenance, and cost difference between uPVC and aluminium windows. Each material has its own strengths, so understanding these differences will help you make the best choice, whether you’re aiming for a refurbishment or a renovation project.

In terms of frame material

Installer adjusting the hardware of a modern uPVC window. (Source: iStock)

uPVC windows are made from unplasticised polyvinyl chloride (PVC) with added stabilisers, which creates a durable, low-maintenance frame that withstands various climates. Manufactured through an extrusion process, uPVC frames are solid and rigid.

This provides excellent insulation, which can help reduce energy bills and offer reliable performance in house renovations focused on energy efficiency. But, these frames tend to be bulkier, which may not suit all architectural styles and glass types.

Aluminium window frames, on the other hand, are built from lightweight but strong aluminium, contributing to their strength and sleek appearance. They’re produced through a similar extrusion process, and can be powder-coated or anodised to improve their resistance to corrosion and provide a broader range of colour options. 

The slimmer profile of aluminium frames gives them a modern look and makes them suitable for any type of glass. This is ideal for homes aiming for a contemporary style with minimal visual obstructions and maximum light.

In terms of insulation

uPVC windows excel in insulation and thermal efficiency due to their low heat conductivity, which makes them an ideal barrier against both heat loss in winter and heat gain in summer. This natural insulation quality, especially when combined with double or triple glazing, keeps indoor temperatures consistent and minimises drafts for homes in colder climates.

Aluminium windows, on the other hand, conduct heat more easily, which can reduce their natural insulation capacity. To address this, modern aluminium window frames often include thermal breaks, which are barriers within the frame to disrupt heat flow. 

Although there are aluminium frames with thermal breaks and you can hire glaziers to add energy-efficient glazing for improved insulation, they generally don’t match uPVC’s inherent thermal performance. This makes aluminium better suited to mild climates or settings where aesthetics and frame strength are prioritised over insulation.

In terms of durability

Inspecting a windowpane for damage or maintenance. (Source: iStock)

uPVC windows are highly resistant to rot, rust, and termite damage, which makes them a good choice for humid and coastal areas. Their UV-stabilised design prevents significant fading, though prolonged exposure to extreme heat may still cause slight warping over the years. 

Overall, uPVC typically lasts 20–30 years. It requires minimal upkeep, with foam weather stripping or vinyl seals aiding in weatherproofing to prevent air leaks.

Meanwhile, aluminium windows offer superior durability and have natural weather resistance. They’re also resistant to corrosion, warping, and UV damage, which allows them to withstand diverse climates, including coastal and high-wind areas. 

With powder-coated or anodised finishes, aluminium frames are even more resilient and last for 40+ years with minimal fading or degradation. Their structural strength also makes aluminium ideal for large glazing panels, which hold up against impacts and temperature shifts without bending or sagging.

In terms of security

Aluminium windows offer superior resistance to impact and tampering, which makes them a strong choice for high-security areas. Aluminium’s rigidity allows for high-spec glazing options, such as laminated or toughened glass, without compromising the frame’s durability. This makes aluminium ideal for commercial settings or high-risk residential areas where robust security is paramount.

uPVC windows can also provide standard security suitable for most residential settings, but not as rigid as aluminium. However, most modern uPVC window providers now offer steel reinforcements and multi-point locking systems, which provide a solid defence against forced entry. For additional protection, uPVC windows can also be combined with double or triple glazing, although this material may not support the highest security upgrades.

In terms of maintenance

Washing a uPVC window during routine home cleaning. (Source: iStock)

uPVC windows require little beyond simple window cleaning with soapy water to stay fresh. Their material naturally resists rust, rot, and discolouration, so there’s no need for additional protective treatments. With UV stabilisation, uPVC frames maintain their colour, though slight fading may occur in areas with intense, constant sunlight over time.

Aluminium windows also demand minimal care but may need a bit more attention in coastal settings to prevent salt buildup. Powder-coated finishes on aluminium window frames are durable and can resist corrosion, but you still need to polish them from time to time to keep the surface looking new. 

Fortunately, you can easily clean aluminium windows with just a simple non-abrasive cleaner. If the protective coating wears down in harsh weather, recoating might be necessary to help extend the frame’s lifespan.

For long-term maintenance, both can be fixed by window seal repairs and aesthetic touch-ups. But if you’re seeking longevity with low upkeep, especially in demanding climates, uPVC is still the wiser choice.

In terms of cost

uPVC windows are generally more affordable upfront, with prices ranging from around £270 to £1,110 per window. This is typical because they're lighter and easier to handle, reducing labour time. This makes them a popular choice for homeowners looking to keep their window installation costs or window replacement costs low.

Aluminium windows usually start at £310 to £1,180 per window, making them more expensive initially. This is mostly because of the premium materials and potential for custom features like powder coatings and thermal breaks. 

Aluminium windows may also require skilled labour and longer installation times, which can increase the total cost. If you’re considering high-end designs or modern styles, then the extra expense might be justified.

Despite the higher price tag, aluminium windows can offer better value over the long term due to their durability and lifespan. Their longevity may offset the costs over time. However, both types offer energy-efficient options, and window energy ratings often favour uPVC for better insulation, so they can also potentially save you money on energy bills.

Experience hassle-free window installation or replacement with Airtasker

Choosing between uPVC and aluminium windows can feel like a big decision, but understanding each material's strengths makes it easier to find the perfect fit for your home. Whether you prioritise insulation, durability, or style, making the right choice can elevate both comfort and curb appeal.

Fortunately, you don’t need to go through the installation alone, either. If you're ready to get started, Airtasker can connect you with experienced window fitters and window and door services professionals who can handle your project with ease. Post a task today and meet experts who’ll bring your window project to life!