how to make a window cornice

Mastering Window Cornice: A Step-by-Step Guide

By Amanda WilliamsDecember 16, 2025

Adding a window cornice to your home can significantly enhance its aesthetic appeal and architectural charm. A window cornice, also known as a window valence, is a decorative element that sits atop a window, providing a finished look and adding a touch of elegance. If you're eager to learn how to make a window cornice, you've come to the right place. This comprehensive guide will walk you through the process, from gathering materials to the final installation.

Before we dive into the step-by-step process, let's briefly discuss the benefits of installing a window cornice. Firstly, cornices can help to hide unsightly window hardware or uneven window tops. Secondly, they can add a layer of insulation, helping to regulate indoor temperatures. Lastly, cornices can be customized to match your home's decor, adding a personal touch to your space.

Gathering Materials and Tools

To embark on this DIY project, you'll need to gather the right materials and tools. The list below should cover everything you need:

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a window with the words diy window corince on it and an image of a

Measuring tape
Pencil
Saw (hand saw, miter saw, or circular saw)
Drill and drill bits
Screwdriver
Hammer
Nails (1-1.5 inches)
Wood glue
Sandpaper (120-grit)
Paint or stain (optional)
Paintbrushes or foam brushes
Lumber (1x6 or 1x8 boards, depending on the desired width of your cornice)
Fabric or wallpaper (for the cornice's face)
Upholstery tacks or finishing nails
L brackets or cornice brackets

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Measuring and Cutting the Lumber

Begin by measuring the width and height of your window. These measurements will determine the size of your cornice. Cut the lumber pieces according to these measurements. You'll need two pieces for the sides, two for the top, and one for the face of the cornice.

For a simple, straight cornice, you can cut the pieces at 90-degree angles. However, if you're aiming for a more ornate design, you may need to use a miter saw to create angled cuts.

Assembling the Cornice Box

Using wood glue and nails, attach the side pieces to the top pieces, creating a box-like structure. Ensure the corners are square by measuring the diagonals and adjusting as needed. Allow the glue to dry according to the package instructions.

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Once the glue is dry, use sandpaper to smooth any rough edges or surfaces. This step is crucial for a professional-looking finish, especially if you plan to paint or stain the cornice.

Adding the Face of the Cornice

Now that the cornice box is assembled, it's time to add the decorative face. This can be made from fabric, wallpaper, or even wood, depending on your desired look.

Attaching the Fabric or Wallpaper

If you're using fabric or wallpaper, measure and cut the material to fit the face of the cornice. You'll want it to be slightly larger than the opening to allow for wrapping around the edges.

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Using upholstery tacks or finishing nails, attach the material to the face of the cornice. Start at the top and work your way down, pulling the material taut as you go. Fold the excess material around the edges and secure it with tacks or nails on the backside.

Painting or Staining the Cornice

If you've chosen to paint or stain your cornice, now is the time to do so. Use a paintbrush or foam brush to apply an even coat to all sides of the cornice. Allow the paint or stain to dry according to the manufacturer's instructions.

For a more professional look, consider applying a second coat. This will also help to ensure even coverage and durability.

Installing the Cornice

With your cornice complete, it's time to install it above your window. This process is relatively simple and can usually be done by one person.

Attaching the L Brackets or Cornice Brackets

Measure and mark the location of the brackets on the back of the cornice. Typically, these will be placed about 1-2 inches in from the sides and top. Attach the brackets using screws or nails, ensuring they are securely fastened.

If you're using cornice brackets, these will be attached to the wall first, then the cornice will rest on top of them.

Hanging the Cornice

Position the cornice above the window, ensuring it is level. If you're using L brackets, drill pilot holes into the wall and secure the brackets in place using screws. If you're using cornice brackets, attach these to the wall first, then rest the cornice on top.

Step back and admire your handiwork! Your new window cornice is not only functional but also adds a touch of elegance to your space.

As you look out your window, you might notice other areas in your home that could benefit from a similar touch. Perhaps a custom-made headboard for your bed, or a decorative shelf to display your favorite books and trinkets. The possibilities are endless, and the satisfaction of creating something with your own hands is truly rewarding. So, go ahead, let your creativity flow, and transform your house into a home that truly reflects your unique style.