Casement Windows

Windows are undoubtedly a key feature in any property. They have an impact on both the aesthetic appearance and character of a building but also, very importantly, fulfil a number of functions such as security, safety, and of course impact heavily upon a building’s energy efficiency. There are many styles of windows available to homeowners but one of the most  popular styles around today in the UK are Casement windows. 

Casement windows are perhaps the most contemporary and convenient of all window types. They are versatile, efficient, customisable, timeless and effortlessly practical being fantastic for ventilation. Plus they offer great value for money - all factors which add up to explain exactly why casement windows are so popular. So, let’s take a look at Casement windows - their origins, benefits and the types of properties they are most suitable for.

What is a Casement window? 

Casement windows are attached to a frame by one or more hinges which allow the window to be opened or closed (a bit like a door). Either a manual or automatic crank, which is located on the corner of the window, allows the window to be fully opened outwards away from the home and to be closed tightly by an interior latch which must be engaged to fully secure the window shut. 

This ability to open Casement windows all the way has the benefit of allowing full viewing outside the house and optimises airflow. It also allows the outside of the windows to be cleaned from inside the home when the windows are fully cranked open. 

Casement windows through history

Casement windows first emerged as far back as the 18th century, and quickly became the window style of choice. They were used as a replacement for stone mullioned windows with the word ‘casement’ referring to the part of the window that opened. At this time glass manufacturing was still very much in its infancy and each Casement commonly featured six small panes joined by glazing bars.

In Tudor homes Casement windows were most commonly multi-paned, with panes usually diamond or rectangular in shape and set within stone or timber openings. Whereas in Stuart times the windows of their homes became taller than they were wide so Casements had to be typically divided into four by a single mullion. They were increasingly constructed from timber and became known as cross casement windows.

Around the Georgian era sash windows emerged. They became very popular replacing many Casement windows which began to be used primarily only in cottages and smaller rural homes. However the Victorian age saw advances in glass production and with this the emergence of larger glass panes, which were then set within timber glazing bars producing Casement windows that were far more decorative in design.

During Edwardian times Casement windows once again reverted back to being more simple and plain in design with larger panes being used.

Casement windows in their many forms have stood the test of time finding favour amongst many different architectural styles, with the design simply evolving in line with the fashion of the day.

Historic Image of Casement Windows in England

What variations of Casement windows are commonly available?

Casement windows impart a contemporary style and with their clean lines and simple geometry they work well with modern style homes. Casement windows have many different configurations for example, the openers can be top or side hung or even fixed.


These are the most commonly seen variations:

The Single Frame Casement window is the most recognisable and comprises of one frame with a casement hinged on the side or top.

Double casement windows, sometimes referred to as ‘French Casements’, comprise of two hinged casements. They may meet at the centre a bit like French doors, or may have a fixed casement(s) in between.

Picture casement windows are fixed casement(s) within the frame – they afford good views and allow light into the room.

Top hung or ‘awning casement windows’ are hinged at the top, opening outwards to let air in at the sides and bottom. They are perfect for homes located in a wet climate as the window blocks out rain.

A bottom hung or ‘Hopper Casement window’ is hinged at the bottom and is ideal for use in basements.

A Transom Casement window is a window that can be either opened to let in air or fixed and mounted above a door or window to let in more light.

Our Casement Windows Profile 

What are the advantages of casement windows?

There are many advantages to having Casement windows installed in your home. These include:


Easy to open and close: They are very easy to open and close – in fact many people say that they are far easier than pushing a sash up and down as all that is required is to simply turn the crank and operate the lock (a lever). It is for reason alone, that Casement windows are recommended as a far better choice than double-hung windows for the homes of disabled persons or those with limited mobility or strength. In fact, Casement windows are ideal for the homes of wheelchair users as they can even be opened and closed while seated in a wheelchair – note that assistance may be needed to operate the latch.

They bring the outside in: Due to their being opened on one or more hinges, Casement windows offer fantastic ventilation opportunities providing a fully open window. And the sashes that are open can even catch breezes and bring them into your house for natural air conditioning.

A room with a view: Unlike many other designs, Casement windows offer an unobstructed view, as they swing open like a door and do not require grilles or muntins for support. You get an unobstructed view outside and even more natural light filtering in through your window. For an enhanced view, you might choose to install flanking Casement window on either side of a large picture window which will provide both an amazing view and improved ventilation.

Energy savings: Casement windows are well known for being highly energy efficient due to the fact that they seal very well. The window sash presses straight onto all four sides of the window frame creating an airtight seal that prevents air entry and cold spots in your home. In fact latching the window further pulls the casement sash further into the seals. This feature means that Casement windows do an excellent job of limiting air intrusion into your home and therefore lowering bills by saving energy.

Security and safety assured: Our range of Casement windows conform to Part Q requirements for security efficiency. This means that they meet the Building Regulations (England) standards windows to resist physical attack by a burglar by being both sufficiently robust and fitted with appropriate hardware. Many Casement windows lock better than other window designs as they utilise a multi-point locking mechanism. In addition casement windows are child-friendly as the distance they open can be limited to prevent falls.

Suited to a variety of property styles: Casement windows are suited to contemporary properties, as well as they are to more traditional styles and cottages. Perhaps one of the best things about Casement windows is that they are available in so many different types. They can be hung in many different ways and are fully customisable as they allow the freedom to choose between features such as different materials, colours and grills.

What are the disadvantages of casement windows?

More mechanical parts: In comparison to other design of window, Casement windows operate with more mechanical parts, this means that potentially more parts could fail e.g. hinges, stays and fasteners.

Cost: Casement windows are typically a bit more expensive. However size, material, placement, and glazing will all factor into coast as well and we do advise not to make your final decision about your replacement windows based on cost alone.

More Mechanical Parts: These type of windows feature latches, hinges, cranks, and other parts. This means that compared to sliders and picture windows, there are more pieces that can wear out and break down over time. Even if the mechanism on Casement windows doesn’t fail, they can slowly loosen over time so that you get more air seepage into your building.

Size Limitations: Due to the fact that Casement windows are mounted, they cannot be very wide. Also, because of their design, Casement windows can’t be too large or too heavy and the opening has to be strong enough to support the window. Because of this fact we always recommend smaller and more lightly constructed windows.

Air conditioners can’t be accepted: As Casement windows crank outward, they can’t accept air conditioners so if this is a requirement for your property, we advise that you chose windows that slide up and down that will be able to accommodate an air conditioner more easily.

Screens or storm windows can’t be used: Finding Casement windows that crank inward is possible, but it is not a common choice. Therefore if you plan to use screens or storm windows, Casement windows are not advisable for your home due to the fact that they crank outward, so the opening cannot be obstructed

Are Casement windows an economical option for replacement windows?

Casement windows are usually more expensive than double-hung windows and this can largely be attributed to the more complex mechanical operations of Casement windows. They are however a cheaper option than vertical sliding sashes. However it should be noted that you may find that the cost of fitting the Casement windows in place of sash windows is more expensive so whilst they are a cheaper option, fitting them is more expensive than normal.

Here at Welbeck Windows we supply top quality Casement windows to homes in London and the surrounding areas. So if you are looking to truly represent your personal style through your choice of windows, we recommend Casement windows as the perfect choice for you! All our windows come with a 10 Year Guarantee and are manufactured to meticulous standards.


Please call us on 0203 583 3525 for a no obligation quotation.


Sash Windows in London

Sash Windows in Central London

Sash Windows in Chelsea

Sash Windows in Mayfair

Sash Windows in Kensington​

Sash Windows in Fulham

Sash Windows in Notting Hill

Sash Windows in Hammersmith

Sash Windows in Chiswick

Sash Windows in Islington

Sash Windows in Shoreditch

Sash Windows in Hackney

  • Instagram