What are Casement Windows?
Casement windows are one of the most popular and versatile window styles found in homes across the UK, including here in Leicestershire and the East Midlands.
At Phair Windows, we frequently recommend these timeless windows to homeowners looking for cost-effective prices, durability, security and modern performance.
But what exactly is a casement window? In this guide, we discuss everything from design features to benefits, and whether it’s the right window for your property.
What is a Casement Window?
A casement window is a window that is hinged, typically on the side, and swings open like a door.
Unlike sliding windows, casement windows open outward (or sometimes inward, depending on the design), allowing for full ventilation and maximum airflow control.
They commonly come in single or double panel configurations, with each panel called a sash.
There are various styles within the casement window family:
- Side-Hung Casement – The most common type, hinged on the side and opens outward.
- Top-Hung or Awning Window – Hinged at the top and opens outward, useful for ventilation even in rainy weather.
- French Casement – Two side-hung panels that open from the middle, resembling French doors.
- Flush Casement – Offers a sleek, flush finish with the surrounding frame, popular in modern homes.
- Fixed Casement – Does not open but maximises light and views; often used as part of a window combination like bay windows.

Why Choose Casement Windows?
Casement windows offer several benefits that make them ideal for many homes:
Maximum Ventilation and Natural Light
Because casement windows open fully, they let in more fresh air compared to other window types that only open partially. Their design also allows them to catch side breezes by angling the sash, improving natural airflow.
Plus, the large glass panel provides an unobstructed view and lets plenty of natural light flood your rooms, brightening your living spaces.
Energy Efficiency
Thanks to their tight seal when closed, casement windows provide excellent insulation. The sash fits securely against the frame with compression seals that prevent drafts, reducing heat loss during colder months and keeping your energy bills down.
When fitted with double or triple glazing, these windows become even more effective at maintaining a comfortable indoor temperature year-round.
Security
Casement windows come with robust locking mechanisms, often multipoint locks that engage firmly when closed. This makes them highly secure and difficult for intruders to lift open from the outside.
Versatility of Design
Casement windows are available in a variety of materials, including uPVC, timber, and aluminium. This means they can be styled to suit traditional cottages, ultra-modern new builds, or anything in between.
Their adaptability extends to colours, finishes, hardware, and glazing options, allowing you to customise your windows to perfectly complement your home’s style.
Ease of Use and Maintenance
Operating casement windows is simple and smooth thanks to their hinge and handle mechanism. They are also easy to clean, especially if designed to open inward.
Also, materials like uPVC are low maintenance and resistant to rot, rust, and fading, giving you beautiful windows for years without hassle.
Noise Reduction
The airtight seal formed when casement windows are closed helps block out external noise. Combined with double or triple glazing, they can significantly reduce noise pollution. Perfect for homes in busy or noisy areas.
Different Parts of a Casement Window
Understanding the components of a casement window helps appreciate the craftsmanship and technology behind it:
- Frame – Holds the window securely in place within the wall.
- Sash/Casement – The movable part that swings open.
- Hinges – Attach the sash to the frame, allowing the window to pivot.
- Lock Handles – Secure the window when shut.
- Mullions and Transoms – Vertical and horizontal bars which support and divide window panels.
- Glazing – The glass area, available in many options including tinted, frosted, and energy-efficient double or triple glazing.

Is a Casement Window Right for Your Home?
Casement windows offer a timeless look combined with modern functionality that fits most properties. Their ability to maximise light, air, and security while being highly customisable makes them a smart choice for any homeowner in the UK.
If you are looking to enhance your home with casement windows, whether it’s for a new build, replacement windows, or improving energy efficiency and aesthetics, Phair Windows can help.
Get in Touch with Phair Windows
Ready to upgrade your home with quality casement windows? Phair Windows offers expert supply and professional installation across Leicestershire and the East Midlands. Our made-to-measure casement windows are built to combine style, function, and durability.
Contact us today for a free, no-obligation quote.
Related Guides:
- How to Choose Windows for Your Leicestershire Home
- What are Wood Effect uPVC Windows?
- Aluminium Windows: Ultimate Buying Guide
- uPVC Window Security Guide: How Secure Are They?
- How Long Do uPVC Windows Last?





