Windows

Smart Systems Alitherm 400 Aluminium Windows

Looking for high-quality aluminium windows for your home, extension or commercial project?
Our Smart Systems Alitherm 400 window range offers the perfect combination of sleek design, strength and thermal efficiency — made to measure for every opening.

Why choose Alitherm 400?

Alitherm 400 is one of the UK's most popular aluminium window systems, designed to deliver modern styling with excellent performance.

Key features:

• Slim, modern aluminium profiles
• Excellent thermal efficiency
• Available in a wide range of colours including Anthracite Grey, Black and dual-colour options
• Internally beaded for enhanced security
• Suitable for residential and commercial installations
• Compatible with contemporary and traditional properties

Whether you're replacing existing windows or working on a new build or extension, Alitherm 400 provides a durable, low-maintenance solution that looks great and performs brilliantly.

Made to measure for your project

All of our Alitherm 400 windows are manufactured to your exact sizes and specification.
We supply trade customers, homeowners, developers and installers across the UK.

Every quotation is tailored to your requirements including:

• Window sizes and configuration
• Colour and finish
• Glazing options
• Cills and ancillaries
• Delivery or collection options

How to get a quote

As all windows are bespoke, pricing is completed manually to ensure accuracy.

To request a quote:

1. Fill out the contact form below
2. Attach a simple drawing or schedule showing sizes and quantities
3. Include any colour or specification details if known

Our team will review your enquiry and get back to you within 48 hours with a full quotation and any technical advice you may need.

If you're unsure on anything, don't worry — just send over what you have and we'll guide you through the rest.