Differences Between Sash and Casement Windows

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How They Open

One of the primary distinctions between sash and casement windows lies in how they open. Sash windows, characterized by their vertical sliding panels, move up and down within the frame. This classic design has been a staple in architecture for centuries. On the other hand, casement windows are hinged at the sides and swing outward like doors. This mechanism allows for a full and unobstructed view when the window is open.

A Casement Window opens outwards on hinges
A Sash Window lifts open vertically

Vertical vs Horizontal Opening

Sash windows offer a vertical opening, which means they are ideal for spaces where height is more significant than width. This design is common in traditional homes, lending a timeless charm to the overall aesthetic. Casement windows, with their horizontal opening, are suitable for wider spaces where capturing a broad view is essential. This horizontal movement often allows for better ventilation and a more contemporary look.

Width of Opening and Light Penetration

The width of the opening is a critical consideration for both natural light penetration and ventilation. Casement windows, opening wide, allow for maximum light to flood into the room. Their design minimizes the obstruction between the interior and the outdoors, creating a seamless connection. Sash windows, while offering decent light penetration, have multiple panels that can slightly obstruct the view, especially when they are partially open.

Ventilation and Draught Proofing

Casement windows, because they open fully outward, provide excellent ventilation. They can catch side breezes effectively and promote better airflow throughout the room. However, sash windows, with their vertical sliding panels, may offer limited ventilation in comparison. When it comes to draught proofing, both types of windows can be effectively sealed, although casement windows may be easier to seal completely due to their closing mechanism.

Security Measures

Security is a paramount concern for homeowners. Casement windows, when equipped with modern locking systems, can provide excellent security. The multiple locking points along the casement’s perimeter make it challenging for intruders to force the window open. Sash windows, while also securable, may have fewer locking points, making them potentially more vulnerable. However, with advancements in security technology, both types of windows can be made highly secure.

Simplicity vs Complexity

Simplicity and complexity are two sides of the same coin when it comes to sash and casement windows. Sash windows, with their classic design, exude simplicity and elegance. Their timeless appeal makes them a favourite among homeowners who appreciate traditional architecture. Casement windows, on the other hand, with their hinged mechanism and outward swing, bring a touch of complexity. This complexity can be seen as a modern aesthetic choice, especially in contemporary and minimalist designs.

Sash Windows vs Casement Pros and Cons

Sash Windows:


  1. Traditional Aesthetics: Sash windows are quintessentially British and are often chosen for their elegant, classic appearance, making them ideal for period properties.
  2. Ventilation: Sash windows can be opened at the top and bottom simultaneously, allowing for effective ventilation by creating a natural airflow.
  3. Easy Maintenance: Modern sash windows often have features for easy cleaning and maintenance, such as tilt-in functionality.
  4. Sound Insulation: Well-made sash windows, when properly fitted, can provide good sound insulation.
  5. Historical Value: For historical or listed buildings, sash windows might be the preferred choice to maintain the property’s authenticity.


  1. Cost: Sash windows are generally more expensive to install compared to casement windows due to their intricate design and craftsmanship.
  2. Energy Efficiency: Older sash windows can be less energy-efficient, although modern versions often come with better insulation properties.
  3. Security: Historically, sash windows might be considered less secure, although modern designs incorporate secure locking mechanisms.

Casement Windows:


  1. Versatility: Casement windows are versatile and can be installed in various types of properties, including modern homes.
  2. Energy Efficiency: Modern casement windows are often designed with energy efficiency in mind, featuring double or triple-glazing options.
  3. Security: Casement windows can be fitted with advanced locking systems, enhancing home security.
  4. Easy Operation: They are easy to open and close, making them convenient for everyday use.
  5. Cost: Casement windows are generally more affordable than sash windows, making them a budget-friendly option.


  1. Aesthetics: Some people find the aesthetics of casement windows to be less appealing, especially for period properties.
  2. Ventilation: While they can provide good ventilation, casement windows may not offer the same level of control over airflow as sash windows.
  3. Space Consideration: Casement windows open outward, so they need space outside the window, which might be an issue in tight spaces or on busy streets.

Sash Windows vs Casement Price Comparison (UK)

  • Sash Windows: The price of sash windows in the UK can vary widely based on factors like material, size, glazing options, and the complexity of the installation. On average, a high-quality uPVC sash window can cost between £500 to £1,000 per window. Wooden sash windows can be more expensive, ranging from £800 to £1,500 per window.
  • Casement Windows: Casement windows are generally more affordable. uPVC casement windows can cost between £250 to £600 per window. Wooden casement windows are slightly more expensive, ranging from £400 to £800 per window.

Please note that these prices are approximate and can vary based on the specific requirements and location within the UK. It’s advisable to obtain quotes from local window suppliers and installers for accurate pricing tailored to your needs.

Which Window is Better: Casement or Sash?

In conclusion, both sash and casement windows have their unique features and advantages. The best choice for you will depend on factors such as your home’s architectural style, the specific room where the windows will be installed, and your personal taste. Consider these factors carefully, and you’ll be able to make an informed decision that enhances both the functionality and aesthetics of your home.


What is the main drawback to the use of a casement window?

The main drawback of casement windows is that they swing outward, requiring space clearance outside. This limits their use in tight spaces or areas with obstructions.

Are uPVC sash windows more expensive than casement windows?

uPVC sash windows are generally more expensive than casement windows due to their intricate design, smooth sliding mechanism, and aesthetic appeal. However, prices can vary based on specific features and brands.

Why do people like casement windows?

People often prefer casement windows because they offer excellent ventilation and are easy to clean. Their outward opening design allows for maximum airflow and natural light, making them popular in many homes. Additionally, they provide a clear, unobstructed view when open.

Which is better sash window or a double hung?

Sash windows have a timeless aesthetic and are often chosen for historical or period-style homes, providing a classic charm. On the other hand, double-hung windows offer more versatility as they can be opened from both the top and bottom, allowing for better ventilation control.

About the author

Glen Ramsey, who presently holds the positions of customer support and content manager, is a cherished member of the Sash Window Refurbish team. He is in a unique position to provide advice on all questions pertaining to the renovation of historic windows because he has a wealth of experience in all elements of window renovation, dealing with clients regularly and assisting them in choosing the best window-related course of action. He oversees the creation of information for all of our platforms in his capacity as content manager, including web content and other materials. Glen has witnessed the whole gamut of Sash Window Refurbish's window restoration activities, from our work on significant listed Georgian homes to a wide variety of smaller-scale private residential projects.


My technician Andrew replaced all my sash windows that had rotten sills. Accessing the rotten sills was not an easy task. He explained to me what needed to be done in order to fix the problem. He is a great person and I’m happy that he was the one who did the job. He is reliable, tidy, friendly and very professional. I highly recommend him.



I hired Andrew and Alex a while back to repair my damaged sash windows. They were was very considerate and very patient as he did his job. A few days ago, I had another problem with one of my sash lock keys and I called him again to come and fix the problem. I’m very impressed that Liam responded quickly and he not only fixed the problem but he also gave me a spare key. What a great after sales service!

Alan W.


I’m very impressed with the new windows that Andrew installed and also the reconditioning job that he did on other sash windows. The quality of his work is by far more superior than what we got when we hired another company a few years back. We will certainly hire him again if any window work arises

Kelly (Sleaford)


Our decorator referred us to Andrew because some of the work needed a window expert. Andrew together with our decorator did a fantastic job. The work was done efficiently and to the highest standards. Andrew is understanding, committed and very professional. I recommend him without any hesitation.

Steaven Reader


Alex did a great job in fixing windows in our terraced house. The windows were broken, frames damaged and the wood was also rotten. Alex's job was high quality and he did it pretty fast. I was also very impressed that he was considerate of my son’s asthma condition and maintained cleanliness. Top work.



Andrew just recently replaced three sash windows in my Edwardian house. He also repaired and replaced some sills and draught proofed three windows. In addition to that, he also did some carpentry work. What I like the most about Liam is that he did a clean job. He is very professional and always updated me about the timescales and costs. He also did his job with minimal disruptions. I highly recommend him.

Cris M.