Casement Windows Vs Sash Windows: Which is right for you?

Casement Windows Vs Sash Windows

Casement and sash windows are two of the most popular styles of windows for homes. But what exactly sets them apart, and which is better suited for your needs?

Here we’ll compare and contrast these two classic window designs.

How Casement Windows Work

Casement windows are distinguished by their hinged opening mechanism. They are attached to the window frame by hinges on one side, allowing the window to swing open outward. This provides excellent ventilation and unobstructed views.

Casement Windows

Casements Come In Several Variations:

  • Side-Hung Casements
    The most common type, side-hung casements are hinged on the side. This classic look offers both form and function.
  • Top and Bottom-Hung Casements
    As the names suggest, these casement styles open from the top or bottom. Top-hung suit wet climates as they open downward while bottom-hung are good for upper floors as the open upward.
  • Single and Double Casements
    Single casements feature one window pane while double casements (also called French casements) have two panes for a wider opening without a central divider.
  • Flush Casements
    Flush casements sit seamlessly within the frame for a smooth, modern look.
  • Fixed Casements/Picture Windows
    Non-opening picture window casements provide an unobstructed view while surrounding windows offer ventilation.

Benefits Of Casement Windows

What makes casement windows a go-to choice for many homeowners?

  • They’re Energy Efficient
    Tight seals reduce air leaks for improved insulation
  • They’re Highly Customisable
    Available in various materials and colours
  • They Provide Enhanced security
    Multi-point locks securely anchor the window
  • Very Low Maintenance
    Easy access to both sides simplifies cleaning

How Sash Windows Work

Sash windows are characterised by their vertically sliding sections called sashes. The windows feature two sash frames that overlap slightly and slide up and down in the window frame.

Sash windows open and close smoothly thanks to a system of weights and pulleys hidden in the frame. Some modern versions tilt inward to make cleaning easier.

The small glass panes, muntin bars, and counterweights are key to the classic style of sash windows.

Sash Window Designs

Sash Windows Come In Several Variations:

  • Georgian Sash
    The Georgian-style sash window has a symmetrical 6 pane over 6 pane design.
  • Half Georgian Sash
    With 6 panes on top and 1 large pane below, the half Georgian offers a twist on the Georgian style.
  • Victorian Sash
    The Victorian sash window features two large panes in each sash for a simple, elegant look.
  • Edwardian Sash
    Edwardian style uses a 6 pane over 2 pane design with larger bottom sashes for increased light.

Benefits Of Sash Windows

Here’s some of the benefits of sash windows:

  • They Have A Traditional Aesthetic
    Sash windows are hallmarks of classic, period home styles. Their proportions and details provide character.
  • They Allow A Lot Of Light & Views In
    Large glass panes without crosspieces allow more natural light in and maximise outward views.
  • They’re Easy To Operate
    The counterbalance system allows sashes to remain in place when open.
  • Good Airflow Control
    Sashes can be opened partially or fully to regulate ventilation.
  • Authenticity In Heritage Homes
    Sash windows maintain architectural integrity of historical buildings.

What’s The Difference Between Sash And Casement Windows?

Casement Window

Casement Window

Sash Window

Sash Window

Casement and sash windows have distinct opening mechanisms that set them apart. Casement windows are hinged on one side and open outward. This allows them to open fully for maximum ventilation.

Sash windows, on the other hand, have vertically sliding overlapping panels or “sashes” that move up and down in the frame. This limits ventilation to the top portion of the window when open.

In terms of aesthetics, sash windows have a more traditional look with smaller divided panes and visible counterweights while casements offer a more modern, streamlined appearance.

Casement vs Sash: Which is Better?

So when considering casement or sash windows, which is the better choice?

Window Size Capabilities

Casements can be customised to fit openings of varying shapes and sizes – even narrow slots.

This isn’t true for Sash windows however, as they require a minimum width of around 2 feet to allow space for the sash mechanism to function properly.

Meaning if you’ve got a smaller window area, you might need to go for casements.

Casement vs Sash airflow when open

Opening Mechanisms

Casement windows are hinged on one side, allowing them to swing open outwards. This provides wide unobstructed views and maximum ventilation.

Whereas Sash windows have two sliding panels or “sashes” that move vertically in the frame. The limited opening reduces visibility and airflow compared to casements.

If views and airflow are important to you, casement might be better suited.

Light Transmission

Casements can accommodate larger uninterrupted panes that let in more natural light. Whereas the meeting rail separating the sashes of a sash window breaks up the glass surface, reducing light transmission.

This makes casements better when it comes to light transmission.


Casement‘s tight closure provides superior insulation against drafts and air leaks.

Sash windows are more prone to infiltration but modern enhancements like weatherstripping can improve thermal performance.


Multi-point locks allow Casements to be securely anchored into the frame when closed.

Whereas Sash windows rely more on the sliding friction fit of the sashes, making them comparatively less secure.

So Are Casement Windows Best?

Not necessarily – Ultimately, the right window for you depends on your priorities. Casements excel at ventilation and security while sashes provide timeless beauty that could be more important.

Looking to get casement windows or sash windows for your home? Give one of our local showrooms a call now on 01394 386666 or 01284 760222.



Are sash windows better than casement?

Sash windows are not inherently better than casement windows; the choice between sash and casement windows depends on your preferences for aesthetics, ventilation, and operation style. While sash windows offer a traditional look and allow for partial opening for ventilation, casement windows provide wider, unobstructed views and maximum airflow when fully opened.

Why do people like casement windows?

People like casement windows because of their energy efficiency, customisable options, enhanced security with multi-point locks, and the ease of cleaning. Their hinged design allows for full opening, offering excellent ventilation and unobstructed views, which appeals to many homeowners.

Are casement windows old-fashioned?

Casement windows are not old-fashioned; they offer a sleek, modern appearance and can be designed to suit contemporary homes. Their functionality and the variety of styles available, including flush casements and French casements, make them a popular choice for both new constructions and renovations.

What does “sash” mean on a window?

“Sash” on a window refers to the movable panels or frames that hold the glass panes. In sash windows, these panels slide vertically (or sometimes horizontally) to open and close, allowing for ventilation while maintaining the traditional aesthetic of period homes.