Does a window need a sill?

Does a Window Need A Sill?

The exterior window sill is one of the most common things to consider when it comes to making your home more comfortable. It is not only convenient but it makes life easier since you don’t have to worry about having to climb up or down from the roof top. You will never want to go back to using the outside stairs again!

You may think that the inside of your house doesn’t need any kind of siding at all, however there are some situations where you might need to add an interior window sill. For example, in houses that have basements where the floor is partially underground and you want to add an interior window with a view of the backyard.

You can build an interior window sill easily. Another situation is if you want to increase the value (and market price) of your home by providing a nice view from the basement. Just make sure that your window has some kind of barrier like a window sill to prevent a child or pet from falling through the window and getting hurt. It’s also a good way to bring in more natural light, which most people prefer nowadays, and it also adds to the aesthetics of a room.

In the past, building an interior window sill was often skipped since it wasn’t seen as being necessary. However, as home design has become more complex and varied, so has the need for adding interior window sills.

How to Make a Window Sill

Now that you know why you would want to make a window sill, it’s time to learn how to do it. It can make a huge difference in the look and feel of a room.

The process of building an interior window sill is very simple. We will be focusing on the most common type of window sill which is the exterior one that goes on the outside of your house. You don’t need any special tools or materials, just some basic carpentry skills and knowledge. Let’s start:

Step 1: Design

The first thing you should do is plan out and design your window sill. Of course there are other types of window sills, but this one is the most popular and common.

You will need several different materials in order to build an exterior window sill. This step is important so you don’t make any costly mistakes or build your window sill in an ineffective way. The first one you will need is wood. The most common type of wood is pine, but you can use whichever type you want as long as it is strong enough to support the weight of a window.

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The first thing you should do when planning out your window sill is to make a list of the materials you will need to build it and how much of each material. You will need a total of 4 pieces of wood, one for each side of the window. Each piece should be a little shorter than the width of the window. This will help you budget and shop for the materials.

You should get an exact measurement of your window so you can buy a window that is the same size. In other words, if your window is 6 feet wide, then each piece of wood should be about 5 and a half feet long.

Next you will need nails, wood glue and wood stain. These are optional but they will greatly increase the durability and sturdiness of your window sill.

Next, you will need to find out how deep the window is. This is important so you can build a proper frame to place the window in. You will need to measure the depth of the window from the outside edge to the inside edge.

Step 2: Cut the Wood

After measuring and preparing your tools, you can start building your window sill. Start by cutting your wood to the proper size. You can usually find scraps of wood that are long enough for this project at your local hardware store or lumber yard for free.

Be sure to sand down the wood after you cut it to ensure there are no splinters. It should be noted that you don’t have to make your pieces of wood exactly the same size or length. You can leave a small gap between them as long as you plan accordingly for it in the design.

This is an example of what your window sill should look like after it is cut and sanded down. You can add a stain or paint on it to make it the color of your choosing. You can stain it to match the rest of your house or paint it a contrasting color for a unique look.

As you can see, this window sill has a gap between the pieces of wood. This isn’t usually possible with store-bought window sills because they are made in a factory and come that way. With a custom-built window sill, you have a lot more freedom in how it looks.

Step 3: Assemble Your Window Sill

The next step is putting your window sill together.

The first thing you should do is place the window in the middle of your frame. Use a nail and nail it into one of the outermost corners. Then, use glue to secure the window in place. Leave it to dry for at least a few hours or even over night.

Then, you can begin adding your sides to your window sill. There are many different ways you can place the window sill pieces on the window. One way is to have all the sides touching the edge of the window so it looks similar to a box.

Another way is to have the sides jut out past the window so it looks similar to an L shape.

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You can also do something in between the two or have each side jut out past the window a little bit and then have one side that goes all the way to the edge of the window.

It is up to you to choose how you want to build your window box.

Step 4: Enjoy Your New Window Sill

After the glue dries, you are done! Your window sill is complete.

Now you have a nice place to put a small potted plant or some flowers. You could even add a little white fence around the window sill if you wanted to. The possibilities are endless.

You can also do this with your other windows. Remember, you don’t have to build the window boxes the same exact way each time. Be creative and have fun!

So that is how you build a window sill. As you can see, it is a fairly easy project. All it takes is some measuring, cutting and wood glue. The more you do it, the easier it will get.

Remember to always sand the wood down and stain it if you want to match your house. Or you could paint it a contrasting color to add some flair to your home.

Also remember that this guide is simply a guideline. You don’t have to follow all or any of it. Feel free to be as creative as you want!

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If you build a window box or window sills, take a picture of it and send it to me. I’d love to see how your project turns out.

Have fun and keep building!

Your Friend,


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