Side hung casement windows

A casement side hung window features a hinge at the side. Our Smarts Alitherm 400 range feature low line gaskets for slimmer sightlines, as well as friction hinges and Espag locking handles by Mila.

Top hung casement windows

A top opening casement window opens from the bottom with a hinge at the top, encouraging ventilation. Choose from a selection of internally and externally beaded aluminium frames, each made to the highest security and energy efficiency standards.

Flush casement windows

Flush aluminium windows sit flush in the frame when the window is closed, ideal for modern homes. The Alitherm 400 collection is ideal for flush sash windows, providing a compact design with a polyamide thermally broken profile for energy efficiency. Optional trickle vents are also available.

Fixed casement windows

Fixed panels do not open, but may be part of a group, such as a bay window design. Customise yours with our Smarts Alitherm selection, offering security upgrades and two glazing options to protect your home.

Glazed casement windows for modern homes

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Our contemporary aluminium casement windows are internally or externally beaded for simple installation, featuring high-quality hinges and handles for security. With trickle vent add-ons and lock upgrades available, they offer lasting durability, excellent energy efficiency, enhanced security, and reliable weather protection for modern living.

Customisable Options

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Our aluminium casement windows can be tailored to suit any home, offering a wide choice of styles, colours, handles, and glazing options. Whether you prefer a contemporary or traditional look, you can customise every detail to create windows that perfectly complement your property.

Opening Configurations

Select from functional, stylish window openings to suit your space – side hung, top hung, or top hung fixed bottom

STOCK COLOUR OPTIONS

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

SPECIAL COLOUR OPTIONS

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

Handles

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

Trickle Vents

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

Quick Glaze Bead

For faster installation

Key specifications

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Our casement windows meet these standards as a minimum, with some products offering upgrades or higher 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

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Frequently asked questions

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What is a casement window?

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.

Is an aluminium casement window better than uPVC?

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.

What is the lifespan of an aluminium casement window?

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.

What are the advantages of aluminium casement windows?

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.

Why choose Atlas?

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.

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