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ALITHERM 400 Aluminium Windows and Doors System

Aluminium Windows Stratford-upon-Avon and surrounding areas


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Slimline Frames

Slimline aluminium frames provide structural stability for larger glass areas and a sleek, modern look you'll love.

Exceptional  Quality

The go-to choice for high quality, contemporary living, style and performance.

Energy Efficient

PAS 24 as standard and exceeds the requirements for weather resistance and security performance.

Finest Aluminium Windows and Doors


Our aluminium range of double glazing solutions brings together a complete collection of windows and doors designed to work across the whole home. The aluminium windows include Alitherm 400, Alitherm 600, Alitherm Heritage and Alitherm 800. Each system offers slim aluminium sightlines with its own style and level of performance, making it easier to choose the right option whether you are replacing existing windows or planning a new extension.


For aluminium doors and larger glazed openings, the range includes Visofold bifolding doors, Visoglide sliding patio doors and Designer aluminium entrance doors. These allow you to open up garden views, improve access to patios and terraces, and create a strong first impression at the front of your home.


All systems sit within one aluminium collection, so your windows and doors can be specified together with matching colours, finishes and hardware. This creates a consistent, well considered look across the property while still giving you the flexibility to choose what works best for each space.

Book a Free Home Visit to discuss your aluminium windows and doors.


Installing  Aluminium Windows with Confidence

When you choose aluminium windows and doors, you are investing in your home. You want to know that you're making the right choice.


Confidence At a Glance:


  • Fully compliant with the latest updates to Document L of the building regulations.
  • Enhanced thermal and weather performance.
  • Brand new, quick glaze bead for a simpler, faster, and cost-effective glazing process.
  • PAS 24: 2016 approved for added security.
  • Unlimited colour choice available through any RAL colour, in addition to four stock colour collections.


Key Features of Aluminium Windows


  • Narrow Profiles and Slim Sightlines:
  • Lightweight, strong, and nearly 100% recyclable aluminium ensures sustainability.
  • Improved property security with no concerns about rust or warping, and minimal maintenance.
  • A vast array of colours to match your property, including dual-colour options for different inside and outside colours.

ALITHERM 400 Aluminium Windows and Doors System

Today, aluminium is the go-to choice for those with a taste for high-quality, contemporary living, stylish looks, and exceptional performance.


Key features include:


  • Advanced polyamide thermal break technology to improve thermal insulation and energy efficiency
  • Slim aluminium profiles that allow for larger glass areas and better natural light
  • Strong, stable frames that maintain performance over time
  • A wide range of RAL colours for full customisation to suit your home
  • PAS 24:2016 tested security features for added protection and peace of mind


The result is a system that not only looks clean and modern but also performs well in everyday use, helping you create a comfortable, secure and well designed living space.

Aluminium Brochure

Modern Aluminium Window Design in a Traditional House

Aluminium windows offer a unique combination of modern design and timeless versatility. While their sleek, slimline profiles and minimalist appearance make them an excellent choice for contemporary homes, they are equally well-suited to traditional and period properties.


Thanks to their customisable styles and finishes, aluminium windows can complement classic architectural features while offering durability, energy efficiency, and low maintenance.


This makes them a perfect solution if you want to blend modern performance with traditional charm.


This house perfectly embodies that traditional style house with modern aluminium windows. The flat-framed style is not unique to modern design. Crittal windows had a flat frame design over 150 years ago.

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Peace of Mind

Proud to be registered with CERTASS, the leading fenestration authority in the UK.

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Experienced

Prior Products is a family business that has been delighting homeowners for over 36 years.

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10 Year Guarantee

Our commitment to quality is supported by a comprehensive 10-year guarantee and is insurance-backed

Why Choose Us For Your Aluminium Windows?

For 36 years, families across Warwickshire and the surrounding counties have trusted Prior Products to improve their homes with windows and doors built to last. As a family-owned business, we understand that choosing new windows is an important decision. Your home is a long-term investment, and the choices you make today should continue to add comfort, value and enjoyment for many years.


What to expect from Prior Products:


• Careful guidance from the first enquiry through to installation

• Honest advice to help you choose windows that suit your home and lifestyle

• A detailed home survey to make sure everything is measured and planned properly

• Windows manufactured with attention to quality and long-term performance

• Experienced installers who take pride in their workmanship

• A finished result designed to enhance your home and last for many years

Aluminium Windows and Doors in Stowe on the Wold

These aluminium windows were installed at a beautiful home in Stow-on-the-Wold, where the homeowners wanted a clean, contemporary look without losing the connection to the surrounding countryside. The slim aluminium frames allow for larger panes of glass, which means more natural light in the room and uninterrupted views across the garden and landscape beyond.


For the homeowner, aluminium offers both practical advantages and a modern appearance that still works with their traditional furniture.


Energy efficiency is another benefit. These windows are fitted with high-performance double glazing and thermally broken aluminium frames to help keep warmth inside during colder months. The result is a comfortable living space with plenty of light while still helping to control energy use.


The anthracite style finish works well with both traditional Cotswold homes and modern interiors. It gives the property a crisp architectural feel inside and out, while the aluminium construction ensures the windows will continue to look good and perform well for many years.

These customers chose Anthracite inside and out, but could have chosen white for the inside. We think the anthracite provides a perfect frame for the view.


Based in Stratford upon Avon, Prior Products installs aluminium windows across Warwickshire including Warwick, Leamington Spa, Alcester, Evesham and the surrounding towns

Aluminium Brochure

Over 200 Colour Options

You have far more choice when it comes to colour and finish with aluminium windows. At Prior Products, we offer a selection of popular colours with short lead times, including White, Jet Black, Anthracite Grey and Anthracite Grey on White. These shades suit many modern homes and extensions and remain some of the most frequently chosen options.


If you are looking for something more individual, aluminium can be powder coated in over 200 colours from the RAL colour chart. This allows you to match existing features, complement brickwork or create a distinctive architectural look. Finishes are available in matt, gloss or textured coatings, depending on the style you prefer.


There are also additional specialist colour collections available with metallic, anodised and textured finishes that bring even more design flexibility.


With such a wide choice, aluminium windows and doors can be tailored to suit both contemporary and traditional homes while maintaining the durable, long-lasting finish that powder-coated aluminium is known for.

Discover the ALITHERM 400

Excellence in Design and Functionality

Its innovative design features polyamide thermal break technology that significantly reduces thermal transmittance by creating a barrier between the cold air outside and warm air inside, enhancing the system's overall ‘U’ value.


The system is also rigorously tested to PAS 24:2016 as standard and exceeds the requirements for weather resistance and security performance.

Frequently Asked Questions about Aluminium Windows

  • Are aluminium windows thermally efficient?

    Aluminium windows today are built for strong energy performance. The frame includes a thermal break which separates the inside and outside elements of the aluminium, helping to reduce heat loss.


    Combined with modern double glazing and high-quality glass, this creates a window that keeps warmth in and cold out. 


    For homeowners, that means a more comfortable home and better control over energy use without compromising on the slim, modern look that aluminium windows are known for.


    Aluminium Windows Stratford upon Avon

  • How long do aluminium windows last?

    Aluminium is one of the most durable materials used in windows and doors. It does not warp, twist or degrade in the same way as some other materials. 


    High quality aluminium window frames can last well beyond 25 years, often much longer when properly fitted. This makes them a reliable long term choice for any building project in the UK, especially if you are looking for something that will hold its appearance and performance over time.


    Aluminium is more expensive than uPVC but the extra longevity can justify the price. Bear in mind that windows are not changed because they haven't lasted the test of time. The choice is usually made as part of a modernisation project. 

  • Are aluminium windows more expensive than uPVC?

    Yes, aluminium windows are more expensive and justifiably so. The cost of materials and manufacture is very much higher.manufacturing


    Aluminium windows are generally positioned as a premium product, so the initial cost is higher than uPVC. 


    However, the value becomes clear when you look at the full picture. The strength of aluminium allows for slimmer frames and larger glass areas, improving the overall design and view from your home. 


    Combined with low maintenance and long lifespan, aluminium often proves to be a better long term investment for those who want quality and performance rather than just the lowest upfront cost.

  • Is Finance Available for Aluminium Windows?

    Yes. Prior Products offers flexible finance options including 0% interest finance to help make premium quality aluminium windows more accessible. This allows you to spread the cost of your new aluminium windows and doors up frontover manageable monthly payments rather than paying the full amount upfront.


    Finance can be a convenient way to invest in improving your home’s energy efficiency, comfort and appearance while keeping control of your budget. Our team will be happy to explain the available options and help you find a payment plan that suits your circumstances.


    If you would like to learn more, you can discuss finance during your home survey.

  • Can aluminium windows be customised in different colours and styles?

    Aluminium windows give you far more control over the final look than most people expect. Colour is only the starting point. Alongside standard options like white, black, grey and anthracite grey, there is a much wider range of finishes available, including textured, metallic and more subtle tones that sit comfortably on both modern and traditional homes. Dual colour is also an option, so the inside can suit your interior while the outside works with the overall building.


    Style and configuration are where aluminium really stands out. You can choose classic casement windows, fixed glazing for uninterrupted views, or larger feature windows that bring more light into the home. Because aluminium window frames are strong, the profile can be much slimmer, which means larger glass areas without compromising performance or security. This opens up more design options, especially when combining windows and doors across a full project.


    There is also flexibility in how the windows are arranged. You can tailor the size, layout and opening configuration to suit each space, whether that is a single window frame or a full elevation of glazing. Details such as the frame profile, glazing options and hardware all contribute to the finished design, so everything works together rather than feeling like a standard off the shelf solution.


    In practical terms, this means aluminium windows can be shaped around your home, rather than your home having to fit around a limited range. The result is a more considered, higher quality finish that improves both the look and the overall feel of the space.

  • Do aluminium windows rust or deteriorate over time?

    Aluminium does not rust, which is one of the reasons it performs so well in all weather conditions. It is naturally corrosion-resistant, so it will not suffer from the same issues as other materials exposed to the elements. 


    This makes aluminium windows a strong and dependable choice, maintaining both their appearance and structural integrity over time.


Aluminium Windows Stratford-upon-Avon and surrounding areas.