Aluminium Casement Windows

Casement Windows

For true flexibility and versatility, choose aluminium casement windows from Atlas. When you buy through us, you’ll have the freedom to customise everything from colours to accessories and security options. Simply select your style and we’ll put you in touch with our trusted installation partners who will do the rest. Promote natural light and ventilation with our high-quality products.

Why choose atlas?

built for quality

We manufacture to the highest standards using premium materials.

made to perform

Products are secure, thermally efficient, and meet building regulations.

approved installers

Approved partner installers ensure every product is fitted perfectly.

nationwide coverage

We operate across the UK, supporting homes nationwide.

Atlas Casement Windows

Our contemporary aluminium casement window range offers flexible design options to suit both modern and traditional homes. Popular options include side-hung casement windows, hinged at the side for smooth operation, and top-opening casements that open from the bottom to encourage ventilation.

For areas where opening windows aren’t required, fixed casement windows provide uninterrupted views. Dummy sash casement windows are also available, delivering the appearance of an opening window while remaining fixed for visual consistency.

All styles can be combined into mixed window configurations, allowing opening and fixed elements to be integrated within the same frame.

Manufactured using the Smarts Alitherm 400 system, our casement windows are internally or externally beaded for simple installation. They feature slimline profiles, low-line gaskets for cleaner sightlines, high quality friction hinges, and secure Espag locking handles by Mila.

Our simple process

Browse our windows,
doors and glazed roof
systems.

Get in touch to
tell us what you’re
interested in.

We’ll match you
with an approved
installer.

Confirm your choice
and look forward to
installation.

Glazed Casement Windows for Modern Homes

Our contemporary aluminium casement windows include optional trickle vents, lock upgrades, and thermally broken profiles, delivering excellent energy efficiency, security, weather protection, and long-lasting performance.

Durable

Resistant to rust, warping, and fading for long-term performance.

Energy efficient

WER rating from B to A+ depending on product.

Security certified

PAS24:2022 security available as an upgrade option.

Weatherproof

Air test Class 4, water test E1200 and wind test AE2400

Customisable options

Our aluminium casement windows can be tailored to suit any home, offering a wide choice of styles, colours, handles, and glazing options.

Custom styles

Choose from a range of modern and traditional styles.

Multiple colours

Select from a vast palette of single and dual colours.

Handle choices

Pick your perfect casement window handles.

Glazing options

Double glazed and triple glazed options available.

Design configurations

Explore flexible window opening options to suit your space, from side-hung and top-hung designs to fixed, dummy sash, and mixed configurations.

side hung

top hung fixed bottom

top hung

Dummy Sash

Fixed

Mixed

Stock colour options

Choose from four stock colours – white, anthracite grey, anthracite grey on white, and black.

White

Grey

Grey on White

Black

Special colour options

Alternatively, select from hundreds of RAL colour options or KL colours for a custom finish.

RAL Colour Range
250+ more

KL Colour Range

Inline Angled Window Handle

Manufactured from 316 Marine Grade Stainless Steel.

Offset Window Handles

White, black, grey, polished chrome, smooth satin chrome, polished gold offset handles.

Monkey Tail Handles

Bronze, black, pewter, polished chrome, polished gold, smooth satin and white monkey tail handle colour options.

Pear Drop Handles

Bronze, black, pewter, polished chrome, polished gold, smooth satin and white pear drop handle colour options.

Trickle Vents

Improving indoor air quality, reducing condensation, and maintaining security and heat efficiency.

Quick Glaze Knock-in bead (Alitherm 400)

Designed for faster, easier installation, reducing time on site without compromising quality.

Key Specifications

All our casement windows meet these standards as a minimum, with certain products available with additional upgrades or higher performance specifications.

Marine grade polyester powder coating
U value as low as 1.4w/m2k (double glazed) depending on product
U value as low as 1.0w/m2k (triple glazed) depending on product
28mm double glazed or 40mm triple glazed
Side hung max o/a width 864mm

Side hung max o/a height 1400mm
Top hung max o/a width 1400mm
Top hung max o/a height 1500mm
Frame depth 70mm
Optional trickle vents
Air, water and wind tested

Take a look for yourself

View our complete aluminium casement window range, showcasing flexible opening options, modern designs, and finishes to suit your home.

Download Brochure

Frequently Asked Questions

Explore our most frequently asked questions to learn more about aluminium casement windows and their features, lifespan, and advantages.

A casement window has hinges that will allow it to open and swing out fully, providing ventilation and natural light to a property. There are different types depending on the style you prefer.

Side hung windows are the most popular, with a simple side hinge. Top hung windows have the hinge at the top, allowing them to open up from the bottom and let rain drain off without entering the property.

In a flush casement window, the pane sits flush within the frame when it is closed, helping it blend into the property and complementing modern styles. Finally, fixed casement windows do not open, and are usually part of a set that do, for example, in bay windows.

Aluminium casement windows are better than uPVC thanks to their durability. While UPVC is cheaper, it typically has a shelf life of around 10 years, while aluminium lasts much longer.

Though plastic is an insulative material and metal is a conductor, every Atlas product uses thermal break technology. This creates a barrier or ‘break’ between cold and hot air, keeping warm air inside your property and lowering your energy bills.

An aluminium casement window will last between 20 and 30 years, depending on upkeep and weather conditions. Our high-quality range is made with durable, weather-resistant materials to guarantee long lifespans without heavy maintenance.

Our casement window range has many advantages. Firstly, it is flexible – you may choose from flush sash windows or sash window fixed panels, as well as top opening casement windows, bottom hung casement windows and traditional side hung designs.

Aluminium is durable, lightweight and long-lasting. Our products are easy to install and have been tested in extreme weather conditions, while they also meet PAS24 security standards. Finally, they are energy-efficient thanks to thermal break technology, offering a U value of up to 1.1W/m2k with our triple glazed range.

Discover other Window products at Atlas

What sets Atlas apart

Choosing the perfect casement window comes easily with Atlas. We understand that there are many casement window types and can refer you to trusted installers, who will talk you through your options.

Flexibility is key as you’ll have the choice to customise accessories, colours, glazing and much more. With our simple ordering process, all you need to do is wait for us to pair you up with a third party expert and you can bring your design to life.

Security, energy efficiency and aesthetic come naturally with Atlas – while every design is uniquely you. Make your house a home with our beautiful casement window collection.