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What is a Casement Window?

What is a Casement Window?

  • Casement windows are recognized as one of the most convenient and popular window styles for modern homes. A casement window consists of vertical panes hinged on the side so that they can swing open like a door. The casement is operated using a mechanical crank or handles which pivot it inward or outward. While the side-hung casement is the most popular configuration, you can have top-hung or awning windows in which the sash hangs from the top. Casement windows have been gaining popularity with homeowners because they offer a simpler, modern, and more streamlined aesthetic. In this article, you will learn about replacement casement windows, their parts, benefits, challenges, and how you can use them for your next home remodel.

Parts of a Casement Window

A casement window consists of several components. Each of the casement window parts assist with the window’s overall functionality. The outer edge of the casement window that attaches to the wall is called the window frame. The frame is typically surrounded by a casing, which is the decorative filling between your window frame and the wall. The part of your casement window that swings and holds the glass panes is called the sash. Frames and sashes are constructed from various materials including metal, vinyl, wood among others. On one side of the sash are hinges which allow it to swing open. Casement windows usually come with a crank handle at the bottom to help with opening/closing. Most casement windows come with horizontal stays that support the sash when open and latches that secure it when closed. Lastly, their are casement window screens that are options that are offered as a window replacement option.

Types of casement windows

  • Side hung casement – Window is hinged on either the left or right side and the crank handle opens the window outward. This is the most common type of casement window.
  • Single casement – Window only has a single frame and is hinged on the side. Most basic casement window style.
  • Double casement – Window with two windows frames that are placed side by side and are each hinged by each side opening from the center outwards. The double casement window is also known as a French Casement.
  • Bottom hung casement – Window is hinged at the bottom of the window frame and opens outwards from the top of the window. This window option is commonly used as a mechanism that allows ventilation and airflow in basements, bathrooms, or upper floor rooms. The bottom hung window is also know as a hopper window.
  • Top hung casement – Window is Hinged at the top of the window frame and opens outward from the bottom of the window. This window option option provides similar functions as the bottom hung but it further helps to prevent rain and water from entering the room.
  • Flush casement – The window opener or crank of this casement window lays flush into the frame when you close the window. This option allows for a more sleek and modern finish of the casement window options.

Benefits of Casement Windows


With their simple design and straightforward aesthetics, casement windows can complement any architectural style. These windows can be tailored to suit any size and come in a wide variety of material & color finishes to suit any homeowner’s preference. Our replacement windows service also offers custom casement window hardware to really make your design unique. In home improvement, casement windows are known to provide style & functionality to both modest and spacious areas.

Ease of Use

Vinyl casement windows come with a simple configuration, making them easy to open and close. The casement window latch, cranks and handles are constructed using simple, mechanical parts that are easy to maintain. With proper maintenance casement windows can be a very durable, so long as the moving parts are constantly lubricated, you will not have issues opening and closing your window. You could also install automatic openers to make the operation easier. Overall with proper maintenance casement windows can be a very durable 

Fully Sealed for Insulation

When you close your casement window, the sash presses firmly against the frame, creating an airtight seal. The windows, therefore, prevent the entry of air and the formation of cold spots in your room. Casement windows also retain your room’s warmth, saving you a fortune in heating costs. This makes casement windows the second most efficient window option, after fixed picture windows.

Improved Ventilation

Since the sash is hinged on one side, casement windows are open top to bottom. You have the option to fully open your window or open it partially in warmer months. You can angle the sash slightly to catch breezes and improve air circulation around the house.

Unobstructed Views

Due to the simple design of casement windows, the panes open wide. The windows, therefore, let in as much light and air as possible. Most casement windows lack the grid lines present in double-hung windows. With these windows, you can let as much of the outdoors into your home as possible, allowing you to enjoy clear views of your front porch, backyard, or neighborhood. Their are even double casement windows options if your looking to maximize natural lighting your your home.


Casement windows are hard to compromise. Once you have locked your window, all of its sides are sealed into the sash, deterring unlawful access into your property. If that isn’t enough some replacement windows even come with security screens for casement windows. If safety is your top priority when replacing windows, you should consider casement windows.

Challenges/Common Issues

Breakage of Mechanical Parts

Casement windows may develop problems with the crank, latches or handles. These parts may rust, break or freeze. The common mistake which causes these issues is neglection and irregular maintenance. To avoid these issues from happening it is recommended you periodically oil the parts to keep them lubricated, keep the parts as dry as you can, and operate them gently.

Components are Exposed

Various parts of your windows are exposed to the wind, snow, and rain because the window opens outward. These extreme elements over time wear down and damage your window. To combat exposure to harsh elements, always close the sash as soon as it starts to rain/gets windy.

Breakage of Sashes

When the wind catches the leading edge of your casement window sash, it can break them with a sail-like effect. Wind gusts tend to break off your hinges in violent weather. If your home lies on the windward side, you can invest in exterior screens and storm windows to provide protection during the windy season.

Conflicting Casements

If you reverse the swing in adjacent windows, the open sashes will conflict. You should consult and review the work with your contractor before installation to ensure that any potential anomalies are prevented or corrected.

Sun Reflection

Open sashes can occasionally reflect sunlight directly into your house. This makes your home’s occupants uncomfortable due to the piercing effect. You can solve this by turning the sash from a different angle.

Where to Install Casement Windows in Your Next Remodel

Installing the right windows often opens up space, especially with casement windows. If you are planning to perform window replacement, you should first create window replacement project plan. You should consider installing replacement casement windows in areas that typically feel claustrophobic and dark. This could be your kitchen sink, bedroom, bathroom, or pantry. You can also use casement windows to give an easy flow and added beauty to a room with French doors. These windows also make for the best window walls, transforming living areas into open, airy spaces with maximum illumination.

To get the best performance from your replacement windows, you should work with a qualified home improvement contractor. If you are in Delaware, Pennsylvania, West Virginia, and Maryland, contact Aspen Home Improvements for your next renovation project. Our qualified experts will be on hand to guide you through the best window styling options to improve your home’s value. Get in touch with our representatives for a free quote on your next home improvement.


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