The Beauty and Versatility of DIY Interior Transom Windows

When it comes to interior design, every detail counts. One often overlooked element that can make a big impact on both the style and functionality of a space is the transom window. Transom windows are a type of window that is positioned horizontally above a door or larger window. They can be found in various architectural styles, from traditional to modern, and offer a unique way to bring in natural light and add character to any room.

Why Choose a DIY Approach?

While you can certainly hire a professional to install a transom window in your home, taking a DIY approach can be a rewarding and cost-effective option. Not only will you have the satisfaction of completing a project with your own hands, but you’ll also have the ability to customize the window based on your specific preferences and needs.

Getting Started: Tools and Materials

Before you begin your DIY interior transom window project, gather the necessary tools and materials. You’ll need a measuring tape, a level, a power drill, screws, a saw, a caulking gun, and weatherstripping. Additionally, you’ll need to choose the type of window you want to install, such as a fixed transom window or one that can be opened and closed.

Measuring and Planning

Start by measuring the width and height of the door or window opening where you intend to install the transom window. This will help you determine the size of the window you need to purchase or build. Additionally, consider the height of the ceiling and the overall style of the room to ensure the transom window complements the existing design elements.

Installation Steps

Once you have all the necessary measurements and materials, it’s time to begin the installation process. Start by marking the placement of the transom window on the wall above the door or window. Use a level to ensure the markings are straight and level. Next, carefully cut the opening for the window using a saw, following the manufacturer’s instructions.

Once the opening is ready, place the transom window in position and secure it using screws. Be sure to check that the window is level and plumb before fully securing it. Once the window is in place, apply weatherstripping around the edges to ensure a tight seal and prevent drafts.

Finishing Touches

After the window is securely installed, it’s time to add the finishing touches. Use a caulking gun to seal any gaps between the window and the wall, creating a seamless appearance. You can also paint or stain the window frame to match the existing trim in the room, further enhancing its aesthetic appeal.

Benefits of DIY Interior Transom Windows

Aside from the satisfaction of completing a DIY project, installing an interior transom window can offer numerous benefits for your home. These include:

1. Increased natural light: Transom windows allow natural light to flow into the room, making it feel brighter and more inviting.

2. Improved ventilation: If you choose a transom window that can be opened and closed, you’ll have the option to enhance air circulation in the room.

3. Enhanced visual appeal: Transom windows add a touch of elegance and charm to any space, elevating its overall aesthetic.

4. Privacy without sacrificing light: By installing a frosted or textured glass transom window, you can maintain privacy while still allowing light to filter through.

5. Energy efficiency: Properly sealed transom windows can help reduce energy loss and lower heating and cooling costs.


A DIY interior transom window project is a fantastic way to enhance the style and functionality of your home. With careful planning, the right tools and materials, and a bit of creativity, you can achieve stunning results that will leave you and your guests in awe. So, roll up your sleeves and embark on this exciting DIY adventure to transform your space into something truly extraordinary.