Choosing new windows is a significant investment, and one of the biggest decisions you’ll need to make is which frame material is right for your property.

When comparing uPVC vs aluminium windows, both offer excellent performance, durability and energy efficiency. However, there are important differences when it comes to cost, appearance, strength and the types of projects they’re best suited to.

So, which should you choose?

In this guide, we’ll compare uPVC and aluminium windows across the factors that matter most, helping you make a more informed decision before ordering your new windows.

uPVC vs Aluminium Windows at a Glance

If you’re looking for the quick answer, here’s how the two materials compare:

Feature	uPVC Windows	Aluminium Windows
Cost	Generally more affordable	Higher initial investment
Energy efficiency	Excellent	Excellent with modern thermal breaks
Maintenance	Very low	Very low
Durability	Strong and long-lasting	Exceptionally strong and durable
Appearance	Traditional and contemporary styles	Slim, contemporary frames
Sightlines	Typically wider	Typically slimmer
Security	Excellent with suitable hardware	Excellent with suitable hardware
Best for	Most homes and replacement projects	Contemporary designs and larger glazed areas

Both are excellent choices. The best option ultimately depends on your property, budget and priorities.

What Are uPVC Windows?

uPVC – or unplasticised polyvinyl chloride – has been a popular material for window frames across the UK for decades.

Modern uPVC windows combine excellent thermal performance with durability, security and low maintenance. They’re also available in a much wider range of styles and finishes than you might expect.

Alongside traditional white frames, you can choose from contemporary colours, woodgrain effects and different window styles to complement both modern and traditional properties.

Their combination of performance and affordability makes uPVC windows particularly popular for replacement window projects.

What Are Aluminium Windows?

Aluminium windows use strong, lightweight metal frames to support the glazing.

One of aluminium’s biggest advantages is its strength. Because the material is so strong, frames can often be manufactured with slimmer profiles while still supporting large areas of glass.

The result is a clean, contemporary appearance with slim sightlines and plenty of natural light.

This makes aluminium particularly popular for modern homes, extensions, self-build projects and properties featuring large areas of glazing.

Which Costs More: uPVC or Aluminium Windows?

For many homeowners, budget will be one of the biggest deciding factors.

uPVC Windows

uPVC is generally the more affordable option.

It offers excellent value for money while still providing the energy efficiency, security and durability expected from modern replacement windows.

This can make uPVC particularly attractive if you’re replacing several windows or working within a set renovation budget.

Aluminium Windows

Aluminium windows generally require a higher initial investment due to the material and manufacturing process.

For some homeowners and projects, that additional investment is worthwhile for aluminium’s slim frames, strength and distinctive contemporary appearance.

Best for affordability: uPVC windows.

Which Is More Energy Efficient?

Energy efficiency is understandably one of the most important considerations when choosing replacement windows.

uPVC Windows

uPVC has naturally good insulating properties, helping to reduce heat transfer through the frame.

Combined with modern double glazing and quality seals, uPVC windows can deliver excellent thermal performance and help reduce heat loss from your home.

Aluminium Windows

Aluminium naturally conducts heat more readily than uPVC. However, modern aluminium window systems use thermal breaks within the frame to reduce heat transfer.

This has significantly improved the energy efficiency of modern aluminium windows.

Rather than choosing a window based solely on its frame material, it’s worth considering the performance of the complete window system, including the glazing, frame, seals and energy rating.

Best for energy efficiency: Both can offer excellent performance.

Which Looks Better?

Appearance is largely down to personal preference and the style of your property.

uPVC Windows

Modern uPVC is incredibly versatile.

Depending on the window system, you can choose from a variety of colours, finishes and designs, including:

• Casement windows
• Flush casement windows
• Traditional white frames
• Contemporary grey finishes
• Wood-effect finishes

Flush casement designs can be particularly effective on more traditional properties, providing a classic appearance alongside the benefits of modern uPVC.

Aluminium Windows

Aluminium is known for its slim frames and clean lines.

Its strength allows for narrower profiles and larger areas of glass, making it particularly well suited to:

• Contemporary homes
• Modern extensions
• Self-build projects
• Garden rooms
• Properties with large glazed openings

If maximising natural light and achieving a minimalist appearance are priorities, aluminium has a clear advantage.

Best for appearance: It depends on your property and personal preference.

Which Is More Durable?

Both uPVC and aluminium are designed to withstand the changing British weather and require far less maintenance than traditional timber frames.

uPVC Windows

Quality uPVC is resistant to rot and corrosion and requires very little ongoing maintenance.

With appropriate care, modern uPVC windows can provide reliable performance for many years.

Aluminium Windows

Aluminium is exceptionally strong and durable.

Its strength is one of the reasons it can be used to create slimmer frames and larger window designs without compromising structural performance.

Quality finishes also help protect aluminium frames against weathering and corrosion.

Best for strength and durability: Aluminium.

Which Requires Less Maintenance?

There’s very little separating uPVC vs aluminium windows when it comes to everyday maintenance.

Unlike traditional timber frames, neither needs regular sanding, painting or staining.

Routine care generally involves:

• Cleaning frames with warm, soapy water
• Keeping drainage channels clear
• Checking seals periodically
• Keeping hinges and moving components clean
• Lubricating appropriate hardware when required

Both are excellent options if low maintenance is a priority.

Best for maintenance: Draw.

Which Is More Secure?

Both uPVC and aluminium windows can provide excellent security.

The security of a window isn’t determined by the frame material alone. The complete specification matters, including the glazing, locking system, hardware, manufacture and installation.

Depending on the window specification, security features can include:

• Multi-point locking systems
• Robust window hardware
• Toughened or laminated glazing
• Secure handles and locking mechanisms

When comparing windows, look at the security specification of the complete product rather than assuming one frame material is automatically safer than the other.

Best for security: Both can provide excellent security.

Are uPVC Windows Better for Traditional Homes?

uPVC can be an excellent choice for traditional properties because of the variety of styles and finishes now available.

Flush casement windows, for example, provide a more traditional appearance while retaining the low-maintenance and thermal benefits associated with modern uPVC.

Woodgrain-effect finishes can also provide some of the character of timber without requiring the same level of ongoing maintenance.

Aluminium can still work beautifully on older properties, particularly where you’re deliberately creating a contrast between traditional architecture and a contemporary extension.

Are Aluminium Windows Better for Modern Homes?

Aluminium is particularly well suited to contemporary architecture.

Slim frames, clean lines and larger glazed areas can complement modern extensions, new builds and properties designed around natural light.

Aluminium windows can also work particularly well alongside other contemporary features such as aluminium bifold doors.

However, modern uPVC shouldn’t be overlooked. Contemporary colours and frame designs mean uPVC can also work extremely well on modern homes.

uPVC vs Aluminium Windows: Which Should You Choose?

There’s no universal winner when comparing uPVC vs aluminium windows.

Your decision should come down to what matters most for your project.

Choose uPVC Windows If You:

• Want excellent value for money
• Are replacing several windows
• Want strong thermal performance
• Prefer low-maintenance frames
• Want plenty of styles and finishes to choose from
• Have a traditional or contemporary property

Choose Aluminium Windows If You:

• Prefer slim, contemporary frames
• Want to maximise the amount of glass
• Need larger glazed areas
• Are creating a modern extension or new build
• Prioritise structural strength
• Want a minimalist architectural appearance

For many replacement window projects, uPVC windows offer an excellent balance of affordability, energy efficiency, durability and style.

For contemporary projects where slim sightlines, large areas of glass and modern aesthetics are particularly important, aluminium may be worth the additional investment.

Don’t Forget to Measure Your Windows Carefully

Whichever material you choose, accurate measurements are essential when ordering made-to-measure windows.

Measurements should be checked carefully before an order is placed to ensure your new windows are manufactured to the correct dimensions.

If you’re planning to measure your own windows, take a look at our How to Measure Windows for Replacement guide for practical, step-by-step advice.

At Teign Trade Frames, we’ve been working with windows and doors for more than 50 years.

Our made-to-measure products are manufactured in Devon, hand finished and available to both homeowners and trade customers, with nationwide delivery.

When you order from us, you’ll benefit from:

• More than 50 years of industry experience
• Made-to-measure products
• Quality materials
• Energy-efficient glazing options
• Competitive trade prices
• Products made in Devon
• Hand-finished products
• Nationwide delivery
• Straightforward online configuration

Our experienced team is also available to help if you’re unsure about the right window style or specification for your project.

Frequently Asked Questions

Are uPVC windows cheaper than aluminium windows?

Generally, yes. uPVC windows usually have a lower initial cost than aluminium, making them particularly attractive when replacing multiple windows or working within a set budget.

Are aluminium windows more energy efficient than uPVC?

Not necessarily. Both can deliver excellent thermal performance. uPVC has naturally good insulating properties, while modern aluminium frames use thermal breaks to reduce heat transfer. It’s important to compare the performance of the complete window rather than the frame material alone.

Which lasts longer, uPVC or aluminium windows?

Both are durable materials capable of providing many years of service when properly manufactured, installed and maintained. Aluminium has exceptional strength and resistance to corrosion, while quality uPVC is also designed for long-term, low-maintenance performance.

Which windows require less maintenance?

Both uPVC and aluminium windows require very little maintenance. Routine cleaning and occasional checks of seals and moving components are generally all that’s required.

Which windows are best for a modern home?

Aluminium is particularly popular for contemporary homes because its strength allows for slim frames and large glazed areas. However, modern uPVC windows are also available in contemporary styles and colours, making them suitable for modern properties too.

Which is best: uPVC or aluminium windows?

It depends on your priorities. uPVC windows are an excellent choice if you’re looking for affordability, energy efficiency and versatility. Aluminium may be preferable if slim frames, large areas of glass and contemporary styling are particularly important.

Explore Our Made-to-Measure Windows

When it comes to uPVC vs aluminium windows, the right choice is ultimately the one that best suits your property, budget and project.

If you’re ready to get started, explore our range of made-to-measure windows and configure your requirements online. From choosing your window style and finish to entering your measurements, we’ve made ordering your new windows as straightforward as possible.

And if you’re not sure where to begin, get in touch with the Teign Trade Frames team. We’re always happy to help.