The Different Types of Windows in The UK

April 14, 2025
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The Different Types of Windows in The UK
A living room with security sash windows.

If you’re wondering about the terminology used to describe the different types of windows in the UK, we are happy to explain. That’s because we are called on to install security windows in buildings ranging from the historical to the modern. 

It can be fun knowing you’re using exactly the right terms to describe something, and types of windows are no exception. So, whether you are wondering what Keats meant when he wrote, “Full on this casement shone the wintry moon,” or simply want the right terms to describe your home’s windows, our glossary will be sure to help. 

Different Types of Windows in the UK

Casement Windows

These are among the most common types of windows. Each casement window has a hinge to one side and opens outward. This simple single or double window design predates sash windows, although modern innovations make them more energy efficient

Sash Windows

Although sash windows only became widespread in the Georgian and Victorian eras, most people consider them the traditional style. Each window consists of two panels, with the lower one sliding upward under the upper one. Read more about the different types of sash windows.

Bifold Windows

A bold window consists of sections that slide open by fitting panels together into pairs. Although they are among the rare types of windows in the UK, we still see them from time to time. Aluminium-framed bifold windows have enjoyed popularity as a space-saving architectural trend.

Tilt and Turn Windows

These ingenious windows are favoured in Germany, where they were invented. They can tilt open from top to bottom or open on hinges like casements. In the UK, we like them with a tilt-first configuration that can be adjusted to “turning” to open like casements. 

Sliding Windows

When we think of sliding windows, we often think of aluminium-framed windows that slide sideways to open. However, this term can also refer to horizontal sliding sash windows, a much older expression of this idea. We often see them on historic homes in Yorkshire, and they are sometimes called " Yorkshire sashes” for this reason. 

Bay Windows

Bay windows exude charm. They’re built outward from the building, often enclosing a niche where you can relax and enjoy the panoramic view they offer and the way sunshine and light stream in. The extra light was much appreciated in medieval times, and bay windows are also a feature of Islamic architecture. 

Bow Windows

Bow windows are very similar to bay windows, but instead of being angled, they have a curved, bow-like appearance. This is achieved by using more panes of glass and window panels so that the angles are less marked. 

Rooflight or Skylight Windows

Rather than providing ventilation or being used to see out, roof lights or skylights are primarily there to bring more natural light into indoor spaces. The Romans used open skylights to allow light to stream into some of their monumental buildings. During the Industrial Revolution, glazed skylights were popularised. 

Transom Windows

Also known as fanlight windows, transom windows are panes of glass above doors or other windows. The window above the door of Number 10 Downing Street is a particularly fine example. Prior to the 20th century, transom windows helped people regulate indoor temperatures without allowing easy access to intruders. 

Sidelight Windows

Sidelight windows flank doorways, and once again, their main function is to allow more natural light into interiors. They can also be an ornamental feature. Although they may not look very secure for people living in this day and age, it is possible to have highly secure sidelight windows. 

Fixed Windows

As the name suggests, these windows cannot open. They are only there to admit light. We are inclined to associate them with skyscrapers and modern office buildings, but any visit to a historic church is sure to prove they have been around for a long time.

French Windows

French windows are really doors, but they certainly are made of glass. True French windows consist of a pair of doors opening on hinges to give access to a porch or terrace. However, any glass door that opens onto an exterior space can be loosely termed a French door. 

Are Security Windows a Particular Type of Window?

Almost any type of window can be a security window. Instead of this type of window being classified according to how it opens, or if it opens at all, security windows are characterised by security features that keep intruders out. These include:

  • Sturdy frames that will not easily break, bend, or splinter
  • Impact-resistant, security-rated glass that refuses to break despite repeated blows
  • Strong locking mechanisms that are extremely difficult to force using brute strength or tools

So, if you are concerned about home security but still want unbarred windows that look welcoming while keeping intruders out, achieving your vision is a real possibility. 

At Stronghold Security Doors, we have not overlooked the need for secure windows. We believe that you should be free to choose between different types of windows based on your tastes and your home’s architectural style. 

We will make the secure windows you need to order, opening up a world of choice and an elegantly discreet way of keeping your home, family, and belongings safe. Talk to us about the security windows you need and discover superb security coupled with faultless aesthetics.