Sash Windows vs Casement Windows: Which Should You Choose?
Which should you choose between sash or casement windows? What is the difference and why does it matter? In this post we will tell you the difference between these two popular window types and help you decide which is best for you.
What are the differences between sash windows and casement windows?
Sash windows explained
Sash windows are typically vertical sliding windows. They’re made from two glass-framed panels that sit within a larger frame. These panels overlap slightly and slide up or down to open.
Sash windows are one of the oldest window styles, commonly found in traditional British architecture. When they were first made, glass manufacturing was limited, so large panes weren’t possible. That’s why early sash windows were built from many smaller panes separated by wooden glazing bars. Today, that style is still used to give homes a classical appearance.
Casement windows explained
Casement windows have been around since the Tudor period and are still widely used today. They became the most common window type in the second half of the 20th century thanks to their simple design and easy operation.
Unlike sash windows, casements are hinged (usually at the side) and open outward. Because they don’t need weights and pulleys, they’re easier and cheaper to manufacture. They can also be top-hinged or side-hinged, depending on the design.
Which is the most efficient window – sash or casement?
With modern windows using advanced glazing technology such as a vacuum cavity or low e glass, there isn’t much to choose between the two types of windows.
Both can be made using insulated frames. Both can be sealed effectively. It could be argued that a casement window has a slightly tighter seal due to the locking mechanism, but the difference is barely noticeable.
Whatever your personal preference, choose a good quality low e glass that will insulate your room. Frame material can make a difference when it comes to insulation too. A good quality modern timber such as Accoya® will repel moisture and keep the warmth inside your home. Alternatively, there are specially designed uPVC frames with enhanced insulating properties.
Which window style looks better?
This depends on your property and personal taste.
Sash windows offer a timeless, elegant look that suits period homes and Listed buildings. They’re often required in conservation areas for their historical authenticity.
Casement windows are more versatile and work well in both traditional and contemporary settings. If you’re working on a Passive House or modern new build, a casement design with high-performance glazing might be the best fit.
If you want slim, attractive glazing, vacuum glass is a great choice. It’s the thinnest and most efficient double glazing option available, and ideal for heritage projects too.
For the most authentic appearance, timber frames are best. While wood-effect uPVC is an option, it rarely matches the look and feel of real wood.
Which are the most affordable?
Sash windows are harder to make due to the complex weight and pulley systems needed to make them easier to open – they are more satisfying to use though! This hidden system means that they will always be more expensive than casement windows that just use simple hinges.
So which one should you choose – Sash or casement?
Casement windows are more affordable to manufacture and install. Sash windows require a more complex mechanism (with weights, pulleys, and hidden channels) which makes them costlier.
However, sash windows do offer a unique charm and are often worth the extra investment if you’re after a traditional aesthetic.
Should you choose sash or casement windows?
- Choose casement windows if you’re on a tight budget or working on a modern home.
- Choose sash windows if you want a classic look or need to meet conservation requirements.
- For the best performance, focus on the right materials and glazing. Use modern timber like Accoya® and opt for vacuum glazing for outstanding insulation.
Still unsure? Contact the Gowercroft team for expert advice on choosing the best windows for your home or project.