Last Updated on April 22, 2025

What Is A Casement Window? Types & Benefits

When it comes to choosing the right windows for your home, understanding the various types available is crucial. One of the most popular window styles in the UK is the casement window. 

Whether you’re renovating your home, looking for more energy-efficient solutions, or simply curious about your window options, this comprehensive guide will help you understand what a casement window is, its benefits, types, and how it compares to other window styles.

What is a Casement Window?

A casement window is a window that is attached to its frame by one or more hinges. It opens outward, typically using a hand crank or a simple latch mechanism. The design of a casement window makes it ideal for letting in fresh air and offering unobstructed views. 

Unlike sliding windows or sash windows, casement windows are hinged on the side, allowing them to open like a door.

In the UK, casement windows are often found in both traditional and contemporary homes, providing a versatile and stylish option that can enhance any building. 

These windows are available in various materials, including uPVC, aluminium, and timber, and can be customised to fit your property’s aesthetic and functional requirements.

Types of Casement Windows

Casement windows come in a variety of styles, each with its own distinct features. Understanding the differences can help you choose the best fit for your home or property. Here are the main types of casement windows:

Single Casement Windows

A single casement window consists of a single hinged sash that opens outward. This is the most common type and works well in both small and large spaces. It offers excellent ventilation and security, making it a popular choice for homeowners.

Double Casement Windows

Also known as French casement windows, this style features two sashes that open outward, providing a wider opening for airflow and a grander view. These are ideal for larger spaces or areas where you want maximum ventilation, such as kitchens or living rooms.

Top-Hung Casement Windows

In top-hung casement windows, the window sash is hinged at the top, and the window opens outwards from the bottom. This style is often used in locations where you want to keep the window above eye level, such as above kitchen sinks or in high-rise buildings.

Side-Hung Casement Windows

As the name suggests, side-hung casement windows are hinged on one side, allowing them to open outward like a door. These windows are perfect for areas that need more natural light and ventilation.

Key Benefits of Casement Windows

Casement windows are incredibly popular due to their many benefits. Here’s why you should consider them for your home or property:

Energy Efficiency

Casement windows provide an excellent seal when closed, which helps prevent drafts and reduces energy loss. Their tight-fitting design makes them one of the most energy-efficient window types available, helping to keep your home warm in winter and cool in summer.

Enhanced Ventilation

Due to their outward-opening design, casement windows allow for maximum airflow. This is particularly useful during hot summer months when natural ventilation is preferred over air conditioning.

Security

The locking mechanism on casement windows is integrated into the frame, making them more secure than other window types. When closed, they’re difficult to pry open, providing extra protection for your home.

Unobstructed Views

Since casement windows open outward without a central bar, they offer a clear, unobstructed view. This is especially desirable in areas with scenic views or for homeowners who want to maximise natural light in their living space.

Low Maintenance

Casement windows are easy to maintain, particularly uPVC and aluminium options. Their simple design means fewer moving parts, which reduces the risk of breakage and keeps maintenance costs low.

Casement Windows Prices

The cost of installing casement windows can vary based on several factors, including the material used, the size of the window, and the complexity of installation. While uPVC casement windows tend to be the most affordable, timber and aluminium options can come at a higher cost. 

If you’re considering upgrading your windows, it’s essential to have a clear understanding of the potential costs.

To help you with your budgeting and decision-making process, we’ve created a comprehensive guide on casement windows costs. 

Choosing the Right Material for Your Casement Windows

The material you choose for your casement windows will impact both their appearance and performance. Here are the most common materials for casement windows in the UK:

uPVC Casement Windows

uPVC is the most popular material for casement windows due to its affordability, energy efficiency, and low maintenance. These windows are highly durable and come in a range of colours and finishes.

Aluminium Casement Windows

Aluminium windows are known for their sleek, modern appearance and strength. They are ideal for larger windows or homes with a contemporary style. While they are generally more expensive than uPVC, they offer excellent longevity and thermal performance.

Timber Casement Windows

Timber casement windows are a classic option for traditional homes. They offer a high-end aesthetic and excellent insulation properties. However, timber windows require more maintenance than uPVC or aluminium options.

How Casement Windows Compare to Other Window Types

When comparing casement windows to other popular window types, such as sliding windows or sash windows, several differences stand out:

Sliding Windows

These windows open horizontally, offering a simple and space-saving design. However, they typically do not match the energy efficiency or security that casement windows provide. 

While sliding windows can be a practical choice for some spaces, you may find that casement windows perform better in terms of sealing and heat retention. For a more detailed comparison, check out our post on the differences between sliding and casement windows.

Sash Windows

Traditional sash windows slide vertically and are often prone to air leakage, which can affect your home’s energy efficiency. In contrast, casement windows offer superior sealing and security. 

The outward-opening design of casement windows provides better ventilation and makes them a safer option for homeowners who prioritise security. 

If you’re weighing the benefits of sash windows versus casement windows, check out our detailed comparison to see which option offers the best performance and value for your home.

Request Your Free Window Replacement Quote Today

Are you ready to replace your old windows with high-quality casement windows? Whether you’re looking to improve energy efficiency, enhance security, or simply give your home a fresh look, casement windows can be a great choice.

At Eco Happy, we provide expert advice and professional installation services for new windows. Request your free window replacement quote today and take the first step toward improving your home’s comfort, aesthetics, and energy efficiency. 

Our team is here to help you find the best window solutions that suit your needs and budget.

Conclusion

Casement windows offer a host of benefits, including energy efficiency, security, and enhanced ventilation. With various styles and materials to choose from, there’s a casement window option for every home and budget.