Aluminium windows have become one of the most popular choices for homeowners, architects and developers. Once associated mainly with commercial buildings and contemporary buildings, today’s aluminium windows are very much in the minds of homeonwers looking for new windows and doors, compared to years ago, when uPVC was considered the only option.

Aluminium windows available today are safe, secure, very thermally efficient, and come in a substantial range of styles, designs and opening configurations. They are therefore suitable for virtually every type of property.

Whether you are replacing existing windows, building an extension, renovating a period property or designing a contemporary new-build home, aluminium windows provide excellent durability, slim sightlines, low maintenance and outstanding long-term performance.

The strength of aluminium allows larger areas of glass, wider and taller opening windows, slimmer frames and more design flexibility than many other window materials.

Here, we explain the different styles of aluminium windows available and what makes aluminium such a popular material for modern glazing.

Who makes the best aluminium windows?

Find out which aluminium windows are the best in terms of brand, quality, traditional and contemporary designs, opening options and more.

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Aluminium windows buying guide

Everything you need to know about buying aluminium windows to replace old ones, a new build home or an extension.

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Types of Aluminium Window Explained

One of the biggest misconceptions about aluminium windows is that they are only suitable for modern homes. In reality, aluminium can be manufactured into traditional, contemporary and heritage-inspired designs.

From slim contemporary casement windows to steel-look glazing, sash-inspired designs and large architectural glazing, there is now an aluminium window solution for almost every property type.

Aluminium Casement Windows

Aluminium casement windows are the most common opening window type in the UK. Whether you are looking at a contemporary new build, a traditional replacement window, a steel-look design or a flush casement window, there is a good chance you are looking at a variation of the same basic principle.

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Aluminium Flush Casement Windows

Aluminium flush casement windows are now firmly established in the UK market, with plenty of choice for homeowners and the trade. Flush casement windows differ from regular windows because the opening elements sit within the frame rather than overlapping it. The aesthetic advantage is balanced and symmetrical sightlines with a

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Aluminium Sliding Sash Windows

Aluminium sliding sash windows are available, but they remain one of the more specialist window types in the aluminium market. There are many aluminium casement windows, tilt and turn windows, flush casements and steel look systems. Sliding sash windows are different. The product choice is much smaller, and aluminium sliding

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Slimline Aluminium Windows

When you need new aluminium windows, whether as a replacement for existing windows or for a new building project, slimline aluminium windows can be a top priority for many buyers, over and above other features. Right now, Smart Systems provides the best in slimline aluminium windows. If finding aluminium windows

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Crittall Windows

Do you have a house with old Crittall® windows or other steel casements? The options for replacing Crittall windows with aluminium are now substantial, especially for patio doors, with Alitherm, Aluco, Reynaers and other window brands providing a similar aluminium alternative. You will also benefit from substantially better security and

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Frameless Windows

Frameless windows are one of the most popular architectural glazing features in modern home design. The appeal is obvious. More glass. Very little or zero visible frame, cleaner sightlines. better views and more light. But the term “frameless window” is often misunderstood. Most frameless windows are not completely frameless. They

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Steel look windows

Steel windows and doors have long captured the imagination with their timeless style, ultra-slim frames, and heritage appeal. Yet genuine steel can be costly, take longer to produce, and can struggle with U-Values. Aluminium steel-look glazing steps in to offer you the best of both worlds—classic design paired with modern

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Architectural, Gable and Apex Windows

Most window categories are defined by how they open and function. Casement windows open on hinges. Tilt and turn windows open in two different ways. Pivot windows rotate around a central point. Architectural windows are different. They are defined by their shape, size and relationship with the building itself. An

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Oriel windows and frameless box windows

Oriel windows, also called frameless box windows, are a current architectural trend among homeowners and architects. Their modern features, which seamlessly blend functionality with striking aesthetics, fill a room with more light than a traditional window, adding a contemporary touch to any space. Oriel windows have the added benefits of

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Tilt and Turn Windows

Tilt and turn windows have been popular for decades across Europe and Scandinavia, but in the last few years have become more popular in the UK. Outward opening casement windows are familiar, widely available and suit the way most British homes have been designed for generations. Tilt and turn windows

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Pivot opening and specialist windows

Aluminium is one of the best materials for specialist window designs. Standard casement windows, tilt and turn windows and fixed glazing cover most homes. But some projects need something different. Larger openings. Unusual ventilation or fire and smoke control. Safer openings in commercial buildings. Feature glazing. Specialist access. Or a

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Floor to ceiling windows

For extensions, renovations and contemporary new-build homes, few glazing products change the feel of a room more dramatically than floor to ceiling windows. The appeal is obvious. More light, better views and a stronger connection with the outside world. By extending glazing down to floor level and often up to

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Manufacturing and Installation of Aluminium Windows

Aluminium windows begin life as precision-engineered aluminium extrusions manufactured to strict quality standards.

Modern systems incorporate thermal breaks between the inner and outer sections of the frame. These insulating barriers prevent cold transfer through the aluminium and significantly improve energy efficiency.

Despite advances in manufacturing technology, aluminium windows remain largely hand assembled. Profiles are cut, prepared and assembled to order, allowing virtually unlimited combinations of sizes, colours and configurations.

Most aluminium windows are manufactured specifically for each project rather than supplied in standard stock sizes.

Energy Efficiency of Aluminium Windows

Modern aluminium windows are significantly more energy efficient than many people realise.

Thermally broken frames, high-performance glazing and advanced sealing systems allow many products to achieve excellent U-values and Window Energy Ratings.

Most aluminium windows are supplied with high-performance double glazing featuring low-emissivity coatings, warm-edge spacer bars and argon gas filling as standard.

Triple glazing is also available on many systems where even greater thermal performance is required.

Some of the highest-performing products combine aluminium externally with timber internally, creating hybrid systems that offer excellent insulation while retaining the durability of aluminium on the outside.

Colours and Finishes

One of the major advantages of aluminium windows is the huge range of colours and finishes available.

Most systems are powder coated in a durable factory-applied finish available in more than 150 colours. Textured finishes, metallic colours, dual-colour options and realistic wood-effect finishes are also widely available.

For projects requiring an even more durable metallic appearance, anodised finishes provide exceptional longevity and resistance to weathering.

Homeowners in coastal locations should consider marine-insured to provide additional protection against salt-laden air.

picture of ral and wood effect colour swatches

Aluminium Window Security

Security performance is excellent across most modern aluminium window systems.

Multi-point locking systems, high-security handles and reinforced hardware provide substantial protection against forced entry.

Many products are tested to recognised security standards including PAS 24 and Secured by Design requirements. New-build projects may also require compliance with Approved Document Q.

The strength of aluminium itself provides an additional advantage, creating robust window frames capable of accommodating advanced locking systems and security glazing.

close up picture of multipoint window locking system — Multi-point window lock.

Glass Options for Aluminium Windows

Glass specification plays a significant role in the performance of aluminium windows.

Modern glazing options can improve thermal performance, reduce external noise, enhance security, increase privacy and minimise solar gain.

Available glass options include:

Double glazing
Triple glazing
Acoustic glass
Laminated security glass
Privacy glass
Solar control glass
Decorative glass

Choosing the correct glass specification is often just as important as selecting the window system itself.

Aluminium Windows in Conservation Areas and Listed Buildings

Many modern aluminium window systems aren’t always suitable for heritage and conservation applications, although there are exceptions.

Often you will need to provide drawings or physical windows samples for approval before you can proceed. This may allow some aluminium windows to satisfy planning requirements where conventional contemporary systems may not be suitable.

However, every conservation project is different. Before ordering replacement windows, homeowners should always consult their local planning authority or conservation officer.

Working with an experienced installer familiar with conservation projects can significantly improve the likelihood of securing the necessary approvals.

Why Choose Aluminium Windows?

Aluminium windows combine contemporary engineering with exceptional design flexibility.

Their slim sightlines, strength, durability and low maintenance make them suitable for both traditional and modern properties. Combined with excellent security, impressive energy efficiency and virtually unlimited colour options, aluminium windows remain one of the most versatile window products available today.

To learn more, read our Aluminium Windows Buying Guide or explore our reviews of some of the best aluminium window brands currently available in the UK.