Casement windows open on a side hinge and close tightly against the frame. They’re used a lot because they move easily, hold up well, and let air flow in without much effort. When it comes to casement window sizes, the choice is usually between a standard unit or a custom order.

Standard sizes cover most jobs and are quicker to install. Custom windows are there when the wall opening is odd or when a larger view is wanted. In the sections below, we lay out the common casement window sizes, the custom options, and what to think about before choosing.

What Is a Casement Window?

A casement window is the kind that swings open on a hinge at the side. You crank it out, and it opens like a door. When it shuts, the sash pulls tight against the window frame, which makes it seal well. That’s one reason we recommend them for energy savings.

We put these in a lot of places around the house. Over the sink, in the kitchen, they’re easy to reach. In a living room or bedroom, they work because you get a wide view without a bar in the middle. Since the screen is inside, it stays out of the weather, and that helps it last longer.

Standard Casement Window Sizes

Most homes will work with standard casement sizes, and that’s usually the most cost-friendly route. The widths often start at about 24 inches. Then they go up a couple of inches at a time: 28, 30, 32, and so on. Heights start around 48 inches and then step up six inches at a time: 54, 60, 66, and so on.

Here are some common examples we install a lot:

• 24″ x 48″
• 30″ x 60″
• 36″ x 72″

If your window opening lines up with one of these, it makes things easier. Standard sizes are usually stocked, which cuts down on wait time and keeps the cost lower.

Custom Casement Window Sizes

Not every house is set up for those stock sizes. We run into older homes all the time where the opening is off by an inch or two. In those cases, a custom window is the only real option.

Sometimes it’s not about the fit. It’s about the look. Maybe a homeowner wants a taller unit to bring in more light or a group of wide casements to make a feature wall. Custom sizing lets us build exactly what works. It does cost more, and you’ll wait longer for the order, but if the design or fit calls for it, it’s the right move.

Smallest Casement Window Size

The smallest casement window we usually order is about 24 inches wide and around 36 to 48 inches tall. These smaller units go above a sink, in a bathroom, or down in a basement. They’re good where space is tight, but you still want ventilation.

If you need one even smaller, we can do it as a custom order. The one thing we always check is code. For example, a bedroom needs a certain size opening for emergency escape. A window that’s too small won’t pass inspection, so we make sure the size works before it goes in.

Largest Casement Window Size

On the other end, a single casement can be built around 36 inches wide and up to about 72 inches tall. Some brands stretch that wider, even close to 8 feet, but at that size, the glass is heavy. The hardware has to be strong, or it won’t last.

When someone wants a full wall of glass, we usually set several casement windows side by side. It looks like one big opening, but each unit has its own frame and crank. That way, the parts hold up, and you still get the open view and extra light.

How to Choose the Right Size for Your Home

Finding the right fit goes beyond picking numbers from a chart. We walk every customer through these key points:

• Room needs: Bedrooms often need windows large enough for egress (emergency exit). Living areas may benefit from taller windows that bring in more daylight.
• Ventilation: Bigger casements allow more airflow, which is great in kitchens or family rooms.
• Design balance: The size should match the scale of the wall. A window that looks too small or too big can throw off curb appeal.
• Clearance: Since casements swing outward, we check that the sash will not block a walkway, patio, or landscaping.
• Energy efficiency: Larger glass areas need high-performance glazing to keep heat out in the Kansas City summers and hold warmth in the winters.

Casement Windows vs. Other Popular Window Types

Sliding Window Sizes

Sliding windows move side to side. They are wider than they are tall, often starting at 36 inches wide by 24 inches tall.

Double-Hung Window Sizes

Double-hung windows are very common and come in a wide range, often 24 inches by 36 inches up to 48 inches by 72 inches.

Picture Window Sizes

Picture windows are fixed and do not open. They can be made large, sometimes over 8 feet wide, since they do not need moving parts.

Bay & Bow Window Sizes

Bay and bow windows project outward from the home and are made by combining multiple units. They are usually built custom to fit the opening.

Awning Window Sizes

Awning windows are hinged at the top and swing out. Sizes often start at 2 feet by 2 feet and go up from there.

Standard Window Sizes Across the Board

Most manufacturers keep a chart of their standard widths and heights for each window type. Picking from this list keeps the process simple and cost-effective.

The Bottom Line on Casement Window Sizes

Casement windows aren’t limited to one setup. Smaller ones are handy for bathrooms or a tight wall space, and bigger units can brighten a living room or family area. If the opening doesn’t match a chart size, we just measure and order a window that fits. That way, you don’t have to make the wall fit the window.

What matters most is getting windows that look right and work the way they should. That’s our job. We check the space, talk through the choices, and install it so you’re not left guessing. If you’re ready to plan a project, give us a call and we’ll go over the options together.