Aluminium vs uPVC windows: A comparison guide for homeowners

Choosing new windows for your home can feel overwhelming, especially when faced with the classic dilemma: aluminium vs uPVC windows. Both materials offer unique benefits, but which is the right choice for your property?

As a homeowner, you want a window solution that balances durability, energy efficiency, aesthetics, and cost. At SGC Glass, we’ve been helping homeowners across London, Essex, and beyond make informed decisions since 1995, delivering quality and reliability in every project.

In this guide, we’ll walk you through the main benefits of aluminium and uPVC windows, compare them side by side, and help you decide which type of window best suits your home.

Window frames are more than just a finishing touch – they play a crucial role in your home’s comfort, security, and energy bills. Whether you opt for double glazing or triple glazing, the material of your window frames can have a big impact on heat loss, noise reduction, and long-term maintenance needs.

Aluminium vs uPVC windows: Key differences at a glance

Let’s start with a quick overview of how aluminium and uPVC windows compare:

Feature	Aluminium windows	uPVC windows
Strength & Durability	Very high	Good
Lifespan	40+ years	20–30 years
Thermal Efficiency	Good (with thermal break)	Excellent
Maintenance	Low	Very low
Cost	Higher	Lower
Aesthetics	Sleek, modern	Versatile, traditional
Security Levels	High	High
Range of Colours	Wide (powder coating)	Wide (various finishes)

What are the main benefits of aluminium windows?

Aluminium windows are known for their strength and slim profiles, making them a popular choice for modern homes and period properties alike. Aluminium is a highly durable material, resistant to warping, rotting, and weathering, and can last a long time – often over 40 years. This makes these windows ideal for larger window designs or homes in coastal areas where salt and wind can be harsh.

At SGC Glass, we fabricate aluminium glazing systems using trusted names such as Cortizo and Senior Architectural Systems, ensuring outstanding structural integrity and precision engineering in every installation.

One of the standout features of aluminium is its ability to support large panes of glass with minimal frame visibility, letting in more natural light and offering expansive views. With powder-coated finishes, aluminium window frames come in a wide range of colours, allowing you to match your home’s style perfectly.

Thermal break technology has revolutionised aluminium windows, greatly improving their energy efficiency. This means you can enjoy the benefits of aluminium without worrying about heat loss – making them a smart choice for both traditional and contemporary homes.

What are the main benefits of uPVC windows?

uPVC windows are the go-to choice for homeowners looking for a cost-effective, low maintenance window solution. uPVC window frames are highly durable, resistant to rot and corrosion, and require little upkeep beyond an occasional clean. They also offer excellent thermal insulation, helping to keep your home warm in winter and cool in summer, which can lead to lower energy bills.

uPVC frames come in a wide range of styles, including casement windows, sash windows, and flush sash windows, making them suitable for almost any type of building. Whether your home is a period property or a new build, there’s a uPVC window style to suit. With a range of colours and finishes, you can achieve the look you want without compromising on performance.

uPVC windows are also known for their security levels, with robust locking systems and multi-chambered designs that help keep your home safe.

How do aluminium and uPVC windows compare on cost?

One of the biggest differences between aluminium and uPVC windows is the price. uPVC windows are generally more affordable upfront, making them a popular choice for homeowners on a budget. Manufacturing costs for uPVC are lower, which is reflected in the final price tag.

Aluminium windows, on the other hand, tend to be more expensive due to the higher material and manufacturing costs. However, their long lifespan and minimal maintenance can make them a cost-effective option in the long run – especially when you invest in high-quality systems like the Cortizo and Senior Architectural Systems solutions we fabricate at SGC Glass.

Which type of window is more energy efficient?

When it comes to energy efficiency, both aluminium and uPVC windows perform well, especially when paired with double glazing or triple glazing. uPVC window frames are naturally excellent insulators, helping to reduce heat loss and keep your home comfortable year-round.

Aluminium windows, traditionally less insulating, have improved dramatically with thermal break technology. This innovation allows aluminium frames to achieve thermal performance on par with uPVC, making energy bills more manageable for homeowners choosing aluminium.

Are aluminium or uPVC windows more suitable for period properties?

If you own a period property, you might be wondering which type of window best complements your home’s character. uPVC windows are available in a range of styles, including sash and casement windows, which can be designed to mimic traditional timber windows. This makes them a popular choice for homeowners seeking a period look with modern performance.

Aluminium windows, with their slim profiles and contemporary aesthetics, are often chosen for modern homes. However, with the right design and finish, aluminium casement windows or flush sash windows can also blend seamlessly with period properties, offering a stylish update without compromising on authenticity.

This is particularly true when using high-end systems like Cortizo or Senior Architectural Systems, which offer flexible design options to complement a wide range of architectural styles.

What about maintenance and longevity?

Both aluminium and uPVC windows are low maintenance compared to timber windows. uPVC frames need only occasional cleaning to keep them looking their best, while aluminium frames require little maintenance but should be checked for corrosion if damaged.

In terms of longevity, aluminium windows have the edge, with a lifespan of 40+ years compared to 20–30 years for uPVC. However, both materials are highly durable and can stand up to the UK’s variable climate.

How do aluminium and uPVC windows compare on security and style?

Security is a top priority for homeowners, and both aluminium and uPVC windows offer high security levels when fitted with modern locking systems. The choice between the two often comes down to style and personal preference.

uPVC windows are available in a wide range of colours and finishes, making them a versatile choice for any type of building. Aluminium windows, with their slim profiles and modern look, are perfect for contemporary homes but can also be customised to suit period properties.

Which is the right choice for your home?

Ultimately, the right choice between aluminium and uPVC windows depends on your priorities. If you want a cost-effective, low maintenance window solution with excellent insulation, uPVC is a great option. If you’re looking for a highly durable material with a long lifespan and sleek, modern aesthetics, aluminium windows are the way to go.

Our aluminium fabrication partners: Cortizo and Senior Architectural Systems

At SGC Glass, we take pride in fabricating aluminium windows and doors using some of the most reputable systems in the industry – Cortizo and Senior Architectural Systems. These leading aluminium systems are known for their advanced performance, precision engineering, and contemporary finishes.

Whether you’re looking for minimal sightlines, enhanced thermal efficiency, or bespoke colour finishes, both Cortizo and Senior offer versatile solutions to meet modern architectural demands. By fabricating in-house, we ensure every frame is crafted to exacting standards, giving you confidence in quality, strength, and visual appeal.

Why choose SGC Glass for your window replacement?

At SGC Glass, we’ve built our reputation on trust, integrity, and a client-focused approach. Our experienced team is equipped to handle everything from small home projects to large-scale installations, ensuring quality and reliability every step of the way. Whether you’re considering new windows, double glazing, or triple glazing, we offer tailored solutions to meet your specific needs.

We work with homeowners across London, Essex, and the surrounding areas, providing expert advice and professional installation. Our friendly, skilled fitters are known for their attention to detail and commitment to customer satisfaction.

If you’re still weighing up aluminium vs uPVC windows, or if you’re ready to take the next step, contact SGC Glass today. Our team is here to help you choose the right window solution for your home, ensuring you enjoy all the benefits of new windows – improved energy efficiency, enhanced security, and a beautiful finish that lasts a long time.