A Step-by-Step Guide to Replacing Casement Window Glass

Casement windows are a popular choice for homeowners due to their versatility and timeless appeal. However, like any window, the glass can become damaged or broken over time. In this comprehensive guide, we will walk you through the process of replacing casement window glass, ensuring that your home remains safe, secure, and energy-efficient. With our easy-to-follow instructions, you'll be able to tackle this project with confidence and ease.

Assessing the Damage

Before diving into the replacement process, it's essential to assess the damage to your casement window glass. If the glass is cracked or shattered, it's crucial to replace it as soon as possible to prevent further damage, drafts, or potential security risks. However, if the damage is minor, such as a small chip or scratch, you may be able to repair it with a glass repair kit.

Gathering the Necessary Tools and Materials

To replace the casement window glass, you'll need the following tools and materials:

Replacement glass (ensure it's the correct size and type for your window)

Work gloves

Safety goggles

Utility knife


Glass suction cups (optional)

Glazing points

Glazing putty or caulk

Painters' tape

Clean cloth

Glass cleaner

Removing the Damaged Glass

1. Prepare the area:Lay down a drop cloth or tarp to catch any broken glass and debris. Put on your work gloves and safety goggles to protect yourself from injury.

2. Remove the casement window sash:Casement windows typically have a crank or latch that allows you to open and close the window. Open the window fully, then remove the screws holding the sash in place. Carefully lift the sash out of the window frame and place it on a flat, stable surface.

3. Remove the old glazing:Using a utility knife, carefully cut away the old glazing putty or caulk from around the perimeter of the glass. Be sure to cut as close to the glass as possible to avoid damaging the window frame. Once the glazing has been removed, use a screwdriver to remove any glazing points holding the glass in place.

4. Remove the damaged glass:Carefully lift the damaged glass out of the window sash using glass suction cups or by gently prying it with a screwdriver. Dispose of the broken glass responsibly, ensuring that it's wrapped securely to prevent injury.

Installing the New Glass

1. Clean the window sash:Before installing the new glass, clean the window sash thoroughly. Remove any remaining glazing putty or caulk, and use a clean cloth to wipe away any dust or debris.

2. Apply glazing putty or caulk:Apply a thin, even layer of glazing putty or caulk around the perimeter of the window sash where the new glass will sit. This will help to create a tight seal, preventing drafts and moisture from entering your home.

3. Install the new glass:Carefully place the new glass into the window sash, ensuring that it's properly aligned and seated in the glazing putty or caulk. Press down gently to create a secure bond.

4. Secure the glass with glazing points:Insert glazing points around the perimeter of the glass, spacing them approximately 6 inches apart. These small metal clips will help to hold the glass in place while the glazing putty or caulk dries.

5. Apply more glazing putty or caulk:Apply another layer of glazing putty or caulk around the edge of the glass, smoothing it out with a putty knife or your finger. This will create a clean, professional finish and ensure a proper seal.

6. Clean the glass:Use glass cleaner and a clean cloth to remove any fingerprints, smudges, or residue from the new glass.

7. Reinstall the casement window sash:Carefully lift the window sash back into place in the window frame, ensuring that it's properly aligned. Reattach the screws to secure the sash, then close the window and test its operation.

Final Thoughts

Replacing casement window glass doesn't have to be a daunting task. With the right tools, materials, and a bit of patience, you can successfully complete this project and restore your home's safety, security, and energy efficiency. Remember to always take the necessary safety precautions and consult a professional if you're unsure about any part of the process. Happy home improvement!

Casement Window


Casement windows are the most common style of window. They feature hinged panels that swing open and closed. Casement windows are available in single panels or multiple panels. The direction a door swings, either to the right or the left, is called the handing. In addition to handing, window are identified as either inswing or outswing depending on whether they open into the house or towards the outside.


Our team of experts will work with you to develop a bespoke plan that fits your needs. We take a holistic approach to the planning process, combining our technical expertise with our knowledge of customer requirements and project constraints.


Freedom to dream "truly custom-made"

Doorwin provides one-stop solution for professional windows doors manufacturer and installation. We have been serving customers with our high quality and branded products in United States, Asia and worldwide.


This newly built private house is in Sydney, Australia. The area occupied by the fenestration system in our scheduled design drawings was up to more than 110 square meters. A wide range of design details made the perfect mix of modern aesthetics and traditional sophistication, the simulated vertical hung windows with tilt & turn opening systems in this home are absolutely breathtaking. SDLS (Simulated Divided Lites with Spacer Bar) brings some historical vintage feeling to the whole building without losing any energy saving performance. Long narrow fixed windows creating larger-than-life expenses, coupled with German high-end systems made this project stand out from the rest.

Simulated Hung Window with Tilt & Turn Openings

The client's idea was to maintain a certain vintage feel, and our aim was to meet the energy efficiency needs and standards of modern houses as much as possible while maintaining a retro design. Doorwin’s 61S simulated hung windows with tilt & turn openings is a respectful modernization of a classic architectural masterwork.

Why choose the tilt and turn opening method?

Because it generally has better air seals than sliding, single hung, or double hung window frames. Tilt and turn windows form a complete seal when fully closed, this means they are less prone to water leakage, and cold draughts and you’ll keep more of your heating indoors where it belongs. They can be opened in the upper tilt way to ventilate at a minimum opening status and are easy to clean outside of the glass; when there’s a good day, they can be opened as normal inward casement windows.

Large Energy Efficient Fixed Windows

Our well-crafted bespoke systems enhance the functionality and panoramic view of this modern house.

Huge, fixed glass walls up to seven meters long and two meters high bring great lighting and open views, making it really refreshing to the mind. Five meters high long narrow windows give the whole building a contemporary aesthetic.

Every window’s placement and shape not only add to the uniqueness of this home but also provide a more energy-saving ability for the owners.

Doorwin energy-efficient integrated glazing units feature double-pane glass, warm-edge spacers, argon gas fill, Low-E coatings, and fully tempered glass, they can not only create a comfortable and natural indoor environment but also save electricity bills and heating bills of more than 100 USD for the owner, it’s a real bargain compared to choosing a regular glazing set.

Custom Designed Thermal Break Aluminum Entry Door

Aluminum Door offered an air of uniqueness and elegance to a home. With their luxurious patterns and beautiful finishes, it provides this house with a bounty of aesthetics and security. Aluminum entry doors allow you to resist any weather extremes, corrosion, and pests. So aluminum is one of the most resilient and durable materials you can select for front doors considering the price/performance ratio.

With pieces of double panes, and Low-E tempered glass. The door provides a good insulation performance.

Custom Designed Grilles and Transom

Divided lite windows and doors offer unique architectural solutions for buildings without compromising energy efficiency or aesthetics. Doorwin provides multiple muntin and glass options to customize your divided lite windows and doors. Further customization is available with a variety of colors and materials, creating an infinite number of design combinations to best suit your style.

In this project, we use SDLS (simulated divided lites with spacer bars), these bars permanently adhere to both sides of the glass, and spacer bars are installed between the glass, this is the most energy-efficient way to create the look of classical décor grilles. The windows in the bathroom bedroom and study have an Arch Transom Design, making these rooms, which are often used by the owner, have some traditional aesthetics.

BTW, Doorwin offers free design assistance, so if you need a custom design like this one, contact us right away and we will provide you with the most aesthetically and functionally pleasing design solution.

German Imported Hardware System

For windows and doors, hardware is as important as the engine is to the car. The continuous technological innovation of the European hardware industry has strongly promoted the performance improvement and functional innovation of windows and doors. In this project, Doorwin uses Hoppe™ multi-point locks, hinges, and handles from Germany.

Multi-point lock systems provide not only the burglar-resistance but also a tighter compression seam, making the window keeps good energy-efficient performance. Together with Technoform Bautec’s insulation edge bond and sealant strips, these make up our products' top insulation and energy-saving performance.

Save Your Money On Installation Costs

We have several international patents to reduce clients’ labor costs, such as our unique flanges and assembly type tubular design, which is different from the other products on the market. What sets us apart among Chinese counterpart is that all our products are equipped with nail fin structures for quick and easy installation. Labor costs during installation may exceed of the window and door price, therefore, our exclusive patent allows users to not only get a significant increase in installation efficiency, but also greatly reduce the labor cost of window and door installation. A cost that may bring you unexpected savings that far exceed the price difference you may care about now.

Free Design Assistance

With our own expertise, we provided the no-cost design development and contract documentation with CAD & BIM drawings, including elevation, details about the project, and installation help.

Before production, we will provide accurate sample drawings, which will clearly show the cross-sectional pattern, size, opening method and direction, pattern of the warm spacer, and the installation nodes. We will not go into production until you have signed off on the drawing to ensure that you receive a final product that meets the exact requirements of your project.

About Doorwin

Doorwin's professional packing system guarantees all products are delivered safely and without any damage. We apply a four-point packing system. Firstly, adhesive plastic film is applied on interior wood frames and exterior aluminum frames to avoid scratches on the surface. Then, a paper board is applied after we apply air bubble film surrounding the whole windows/ doors to avoid any destruction or clash. Lastly, we place them into a durable non-fumigation plywood crate to avoid any possible damage during transportation.

With years of experience shipping our products worldwide, we could guarantee to ship our products to their final destinations intact and without any damage.

About Doorwin Factories

Doorwin is one of the most professional window & door manufacturers are known for its great customized products. In Doorwin, a variety of colors, styles, and sizes of products are available to meet the client’s unique requirements. We own three ISO9000-certified modern factories in China. With a factory area of 20,000 m2 and a production capacity of 100,000 m2 per year. Doorwin Group has the scale to ensure timely delivery and the flexibility to reduce manufacturing lead times to as short as 18 days.