What Are Casement Windows?

As a window replacement company with 40+ years under our belt, we’ve heard people call casement windows by numerous names: swinging windows, crank windows, crank out windows, hinged windows, crank open windows, windows that open out, roll out windows, swing out windows and the list goes on. No matter what you call them, casement windows are a perfect combination of form and function and will enhance your home with a distinctive appeal.

But what are casement windows? Casement windows are a type of window that is attached to its frame by one or more hinges at the side. They open outward like a door, usually with the help of a handle or a crank.

Advantages of Casement Windows

Unobstructed Views

The first thing you notice about casement windows is the unobstructed view of the outdoors. It doesn’t matter what the view is, casement windows just catch your eye. If you’ve ever been in a home with a full wall of casement windows, you know what we mean.

With single and double-hung windows the sash of the two windows meets in the middle forming a horizontal line. The horizontal line breaks the outside view into two pieces, top and bottom. Casement windows, on the other hand, are typically a full piece of glass with no break in the middle. Of course, there are exceptions where people have installed grilles or blinds in their casement windows. But typically, in Colorado you’ll see full panes of glass that offer a large view that brings the outdoors inside and makes the room feel that much bigger.

Fresh Air

If you love fresh air, casement windows can’t be beat. One of their great advantages is the ability to direct air flow into your home. If you love a cool breeze and the prevailing winds don’t currently bring the breeze into your home, choose a casement window that opens away from the prevailing breeze to guide it into your home. For instance, if your home faces east and winds come from the west, choose a casement window that is hinged on the east side capturing the west wind. The open window will redirect the airflow and bring the fresh air into your home.


Another advantage of casement windows is security. Casement windows are considered the most secure due to their unique locking mechanism. They feature hook-shaped locks that embed directly into the frame, making them difficult to pry open from the outside. Additionally, the crank of casement windows has a limiter in the gear mechanism that will stop the window from opening past the position where you left it. This prevents them from being opened further from the outside without breaking the window altogether, whereas a single, or double-hung window that is left open the slightest bit can be lifted further to gain entry.

Energy Efficiency

When it comes to windows, casement windows are the energy-efficient choice for homeowners seeking both style and sustainability. Unlike traditional windows, casement windows come with a seal that’s air-tight when closed, drastically reducing the risk of energy leaks. This design makes casement windows incredibly energy-efficient, ensuring your home stays warm in the winter and cool in the summer without overworking your HVAC system. Better energy efficiency means lower utility bills and a smaller carbon footprint—a win-win for both you and the planet.

Energy Conservation

In addition to being energy efficient, casement windows also aid in energy conservation. When you use casement windows in your home natural light is maximized, reducing the need for artificial lighting. And when the breeze is just right, you can swing the window open for optimal ventilation reducing the need for air conditioning.

Types of Casement Windows

Double Casement Windows

Double casement windows consist of two casement windows side by side, each opening outward from a central mullion. This design doubles the airflow and provides a symmetrical aesthetic that enhances both traditional and modern homes. Ideal for larger openings, double casement windows offer expansive views and increased ventilation, making them a practical choice for living rooms, kitchens, and other spacious areas.

Double casement windows have a central mullion down the middle where both windows meet.
Double casement windows
French casement is like the double casement windows but does not have the central mullion.
French casement windows

French Casement Windows

French casement windows are a charming addition to any home, featuring two sashes that open without a central pillar, providing a full, unobstructed view. They operate without a mullion, allowing for a wider opening that enhances access and invites more natural light. Perfect for romantic or country-style homes, they add an elegant, classic touch to architecture.

Push Out Casement Windows

Push out casement windows are a classic alternative to crank-operated casement windows. They open outward with a simple push, offering a more streamlined look without the mechanical components of traditional casements. This type of window is particularly favored in heritage and period-style homes where maintaining authentic aesthetics is essential.

Casement Egress Windows

A casement egress window is a casement window that can open wide enough and is easy enough to operate so that it can be used as an emergency exit. In Colorado all bedrooms require egress windows.  Here are the key requirements for all egress windows not just casement windows:

Size: The casement window must be big enough for a person to fit through. The rules say it must have an open area of at least 5.7 square feet, be at least 24 inches high, and 20 inches wide.

Operation: It must be simple to open without needing keys or tools, and it must open from the inside.

Because casement egress windows swing open fully and are not blocked by any parts of the window frame, they are particularly useful for meeting these safety requirements.

Comparing Casement Windows to Single-Hung, Double-Hung and Sliding Windows

In this table we compare the features of casement windows to single-hung, double-hung, and sliding windows.

FeatureCasement WindowSingle-Hung WindowDouble-Hung WindowSlider Window
Operation MechanismCrank or push opens outwardSashes slide verticallySashes slide verticallySashes slide horizontally
VentilationExcellent (can open fully)Good (Only the bottom sash opens)Good (both sashes can be opened)Good (half of the window can open)
Ease of CleaningModerate (external cleaning can be difficult)Easy (tilt-in feature for easy cleaning)Easy (tilt-in feature for easy cleaning)Easy (some models tilt in or come out for cleaning)
ViewUnobstructedPartial obstruction from sashesPartial obstruction from sashesPartial obstruction from sashes
SecurityHigh (secure locking mechanism)Moderate (depends on lock quality)Moderate (depends on lock quality)Moderate (depends on lock quality)
Space EfficiencyGood (no interference with interior space)Good (no interference with interior space)Good (no interference with interior space)Excellent (ideal for narrow spaces)
Energy EfficiencyVery high (tight seal when closed)Moderate (seal can be less tight)Moderate (seal can be less tight)Moderate (seal can be less tight)
CostA bit more expensive due to mechanical featuresLeast expensiveModerately PricedModerately Priced

This table illustrates how each type of window operates, its ventilation capabilities, ease of cleaning, how much view it provides, security features, space efficiency, energy efficiency, and cost helping you to compare and decide which window might be best suited for your specific needs. ​

Mixing Casement and Double Hung Windows

Combining casement and double-hung windows in a home can provide both aesthetic diversity and functional versatility. Casement windows are ideal for locations where full ventilation is desired, while double-hung windows can be more practical in spaces where outdoor space would limit a casement window from opening. This mix can cater to varying ventilation needs and architectural styles within the same household.

Casement Window Sizes

Casement windows are available in a variety of sizes to suit different needs and spaces. From small windows ideal for bathrooms to larger options designed for living rooms, the dimensions can be customized to fit specific openings. This flexibility allows homeowners to install casement windows in both compact and expansive spaces, ensuring optimal functionality and aesthetic coherence.

Casement Window Prices

The cost of casement windows can vary widely based on materials, sizes, and custom features. Prices also depend on whether additional features like energy-efficient glazing or custom colors are selected. Generally, investing in higher quality casement windows pays off in terms of durability and energy savings.

Choosing the Right Casement Window Features for Your Home

When you’re in the market for new windows, the array of choices can seem endless, but few match the unique blend of style and function offered by casement windows. At Clearwater Exteriors, we know the ins and outs of replacement casement windows and love to guide homeowners through the process of selecting the perfect windows for their space. With their side-hinged design, casement windows provide superior ventilation and unobstructed views, making them a beautiful choice for any room. They’re also champions of energy efficiency, which is a cornerstone of casement window design. But it’s not just about the practical benefits; casement windows enhance your home’s aesthetics too. As you consider windows, think about the durability and customization options casement windows provide — from the type of glass to the hardware finishes. Remember, when it’s time to upgrade, replacement casement windows can make a significant impact on energy conservation and the long-term performance of windows in your home.