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Casement vs. Sliding Windows: What's the Difference?

Lowe's Editorial Team

By Lowe's Editorial Team
Published July 24, 2024

Windows are a crucial part of your home’s structure. They keep your home appropriately insulated, ventilated and safe. Two common types of windows are casement and sliding windows. They each come with their own pros and cons. Here’s what you need to know about casement vs. sliding windows.

Casement Windows

Casement windows, also known as crank windows,​ swing open like a door. They are attached to one side of the frame with ​​hinges. They can open wide, letting in lots of air and light. Casement windows don't leave any bars or frames in the center of the window opening, giving a clear view outside. They are commonly used in living rooms, bedrooms and hallways. These windows have strong locks and seal tightly.

Casement windows can be installed to open inwards or outwards. They are available in a variety of materials and designs. Wood is the most commonly used material for casement windows,​ but you can get them in ​PCV, vinyl, fiberglass or aluminum as well. Casement windows are available as single frames or double frames.

Sliding Windows

Sliding windows open by sliding one part of the windowpane to the side. They are a relatively newer design, offering a more ​modern look. They are easier to shut and open, even if the window is higher up. If the opening for your window is wider than it is tall, a sliding window will be a good match. Sliding windows have two or more sashes that sit behind one another when opened. For this reason, a sliding window ​can’t be fully opened as there will always be a​ part of the window blocking one side. But this isn't​ usually a problem in wider window frames.

Sliding frames are made from materials like PVC or aluminum as wood is too bulky to slide across the frame. Since sliding frames don’t open inwards or outwards, there is no risk of accidentally knocking into a window. ​This is why sliding windows are often used for tight spaces like small kitchens or bathrooms.

Casement vs Sliding Windows: Pros and Cons

Casement windows

Pros:

  • They seal tightly, which is great for insulation. ​Your home can easily maintain a comfortable temperature regardless of outside weather, helping you save energy.
  • They can fully open, making them an ideal choice for spaces like​ living rooms and sunrooms,​ maximizing natural ​light and​ allowing you to enjoy expansive views.
  • You can comfortably reach behind the window pane making them e​asy to clean. 
  • Typically more secure, with the option of multiple locking points available.
  • They can​​ also serve as emergency exits.

Cons:

  • Require regular maintenance as wood can warp over time and hinges need oiling. 
  • They c​an be a safety hazard when left open.  
  • They can be a bigger investment, especially customized sizes and designs.

Sliding windows

Pros:

  • More affordable option given the simplicity of design.
  • Easy to operate,​ requiring less force as there is a track to guide the panel.
  • Less likely to cause any accidents as ​they don’t swing open. 
  • Available in a range of options for sizing and can be used for much wider openings.

Cons:

  • Air gaps between the sliding frames ​make them less energy efficient.
  • Exteriors can be difficult to clean as you may not be able to reach the back, especially at heights.

When to Choose Casement Windows

Casement windows are best for rooms that need lots of air, like kitchens and bathrooms. Their ability to fully open allows maximum air circulation, helping to remove odors and steam effectively. For spacious rooms with enough clearance around the windows, casement windows can be a great choice. Their outward swinging design requires sufficient space to fully open without obstructing pathways or furniture placement.

​Casement windows are very customizable, so consider them for areas like the front of the home for that extra curb appeal. Apart from the size and material, you can choose from a variety of colors and finishes. Decorative handles and grilles also add to the appeal.

When to Choose Sliding Windows

Sliding windows are an excellent option for rooms or areas that have limited space around the window openings. In high-rise buildings or areas prone to high winds, sliding windows are usually the safer choice. Their design prevents them from catching winds that could potentially blow open a projecting casement window.

When you have the luxury of a wide window opening or a broad space, a casement window could become heavy to operate. Sliding windows allow you to have an expansive glass area while still providing easy opening. Since they simply glide horizontally, even large sliding windows can be easily opened and closed.

Casement vs Sliding Windows: The Final Verdict

Still not sure which window is the best for you? Consider these things when picking windows:

  • Energy Efficiency: ​While casement windows have overall better insulation, modern sliding windows have been designed with minimal gaps, enhancing their energy efficiency.
  • Weather Performance: Casement windows have a tighter seal and perform well in all weather conditions. Sliding windows are not as tight but they are waterproof.
  • Security: Both sliding and casement windows are secure. Check that the windows you purchase have strong frames and locks.
  • Space: Think about how big the opening is, how high it is above the ground and how much room you have to open the window.
  • Airflow: ​​Decide how much fresh air you need for ventilation. Sliding windows open partially while casement windows open fully.
  • Cost: Sliding windows usually cost less than casement windows but cost can depend on the size of the window​ and materials used.
  • Design: Look for windows that match with your home’s décor. Both casement and sliding windows suit traditional and  modern décor.
  • Maintenance: Think about how easy it is to clean and take care of the windows. The location of the window also determines cleaning feasibility. ​Also, you should consider ease of replacement if need be. If the window is in a tight space or has obstacles around it, a sliding window might be a touch easier to replace. If the old window is damaged and needs extra effort to take out, a casement window might be slightly easier because the entire sash detaches from the frame.

By understanding the differences between casement and sliding windows, you can choose the best ones for your home. Think about all these factors to make sure your windows make your home comfortable, loo​​k good and save energy.

Good to Know
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