top of page

All About Casement Windows

What are casement windows? Casement windows open outwards on a sideways swing, rather than sliding. Awning windows differ from casement windows in the direction that they open. Why is a casement window better?

The Benefits of Casement Windows

One visually appealing benefit of casement windows is the minimal obstruction of the outside view. because they don’t have as many supporting pieces. Along with that, they let it more light than windows with multiple opaque parts. Casement windows are also better for airflow because they capture a breeze with the open sash. During cooler months, they typically have less air leakage because they have one single large seal rather than two or more. When there is a big gust of air, it presses on the outside sash, sealing the window rather than flowing through the cracks like a double hung windows. Casement windows help control temperature in the home, thus lowering heating and cooling costs. The ample amount of natural light also helps keep electric bills down. Casement windows are easy to clean and operate as well. They also have a variety of styles including a double casement windows, also known as a French casement window due to the similar motion of French doors when opened. There are multiple opening options for these, a push style, and a crank style. One big advantage with these is that no operating window can produce a larger amount of open space. Casement windows also rate well in home security. They can’t be opened from the outside. Casement’s locks are hook shaped, these hooks are embedded with the frame making them inaccessible from the outside.


Locks and child proofing is important if you have kids at home and casement windows. This style of mechanics is easy for kids to open and can be an escape hazards. Casement windows also have a breaking point much lower than normal windows. The outward opening design, means there is little support on the window while it hangs open. Large gusty windows can be a hazard. If conditions are too windy, keep your casement window closed. Open sashes can break if you leave them open during a windy day. The way air is captured can cause them to break off entirely. Another downfall, you can’t use A/C window units with casement windows. Casement window screens must be placed inside window frames, standard air-conditioners are not an option. Last, available window sizes are limited due to the weight of glass. Unlike fixed windows and sliding glass, There is a maximum size on casement windows due several hazards. The mechanics used to hold it can only hold so much. The Maximum height is 6 foot 8 inches, and width of 3 foot 2 inches. A double hung window can be 10 foot or even slightly taller and a width of 5 foot or more. A Sliding 3 panel window can by 10 foot in width. To have more window space, you will have to purchase more casement windows and install them side by side.

Where to put them

Where to put them

Casement windows allow for an amazing view, so installing a casement window on a wall that has a view is a great idea. They also allow for a lot of light to come in, so any room that needs to be brightened is another good installation space. Areas that need quick ventilation such as kitchens and bathrooms are another great spot for casement windows. A common option for functional bay windows is a casement style. Bay windows have potential to serve the purpose of good views and ample lighting. Using a casement style for a bay window is going to maximize these to sought after elements.

Upgrade to Casement Windows

Z Double B offers several brands of casement windows including Milgard, Anderson, Pella, Cascade, and more! We can help you find the right fit for the space and budget you have. Call us today for a any questions or a free quote at 303-997-8168. Or visit us at Our show room is open 5 days a week and additionally by appointment at 12860 W. Cedar Drive #110, Lakewood, Colorado.

Recent Posts
bottom of page