How To Make A Window Sill

Windows are an essential part of any house. They provide light, ventilation, and a view of the outside world. However, a window without a proper sill can cause many problems. It can let in rainwater, cause drafts, and even damage the walls and floors. That’s why it’s crucial to know how to make a window sill. In this article, we’ll guide you through the process step-by-step.

Materials Required

Before we begin, let’s gather all the necessary materials. You will need a measuring tape, saw, hammer, nails, wood glue, sandpaper, primer, and paint. You can use any type of wood, but we recommend using pine as it’s easy to work with and affordable.

Step 1: Measuring the Window

The first step is to measure the window’s width and depth. Measure from the outer edge of the window frame to the wall on both sides. Then, measure the depth from the window frame to the wall. Add an extra inch to each measurement to ensure a snug fit.

Step 2: Cutting the Wood

Using a saw, cut the pine board according to the measurements you took in the previous step. Make sure the edges are straight and smooth. Sand the edges and the surface of the board with sandpaper to remove any rough spots.

Step 3: Assembling the Window Sill

Apply a generous amount of wood glue on the edge of the board and attach it to the window frame. Secure it with nails at regular intervals. Repeat the process for the other side of the window frame. Let the glue dry for at least 24 hours.

Step 4: Finishing Touches

After the glue has dried, sand the surface of the window sill to remove any excess glue or rough spots. Apply a coat of primer and let it dry. Then, apply a coat of paint in the color of your choice. Let it dry for at least 24 hours before using the window.


Q: Can I use a different type of wood?

Yes, you can use any type of wood, but make sure it’s durable and easy to work with.

Q: Do I need to apply more than one coat of paint?

It depends on the type of paint you’re using. Check the instructions on the can to see how many coats are recommended.

Q: Can I install the window sill myself?

Yes, you can. Just follow the steps outlined in this article, and you’ll have a new window sill in no time.


Learning how to make a window sill is a simple but essential skill for any homeowner. With the right tools and materials, you can create a durable and attractive window sill that will protect your walls and floors from damage. Just follow the steps outlined in this article, and you’ll be able to tackle this DIY project with ease.