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Easy DIY Window Seat Cushion for a Bay Window (No Sew)

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This tutorial for a DIY window seat cushion for a bay window is: quick, easy, cheap, and requires NO sewing.

This is a DIY project my mom has done for me in both of my homes to create both a book nook / reading area and a spot for my cats to relax and look out the windows. (Cats LOVE these window seats.)

They cost my mom about $30 each to make; however, the cost can vary based on other factors, like whether you already own the tools you will need.

They don't take very long to make once you have the materials (generally less than one hour total), and the steps are simple, including just measuring, cutting, and stapling.

I definitely think it's one of those DIY projects that anyone can do, especially because you can buy precut plywood or have your home improvement store cut it for you.

And they last a long time! My cats used them daily in my prior house, and they were still in great condition when we moved seven years later.

This DIY window seat cushion tutorial is meant for a space that's already built, like a bay window. It is NOT meant to teach you how to build a window seat bench, wall, bookcase, window bench with storage, bookcase, or other built-in.

(If you ARE looking to do that quickly and easily, you may want to buy some Ikea cabinets (with or without cabinet doors) to get you started on this DIY window seat cushion project.)

How to Make a DIY Window Seat Cushion for a Bay Window

Below are products we recommend for this DIY window seat cushion that you can buy quickly, easily, and cheaply on Amazon.

(However, you can also buy fabric at JOANN Fabrics, which is where we purchased ours.)

Below are answers to frequently asked questions about this tutorial, followed by the tutorial (including all steps, materials and tools needed), and recommended products for the tutorial.

Frequently Asked Questions

How do you make a simple window seat?

1. Measure space and subtract 1" from all four sides to get your final measurements.
2. Cut plywood per your final measurements.
3. Cut upholstery foam per your final measurements.
4. Place your fabric, foam, and plywood straight on a flat surface.
5. Cut fabric 7" to 8" longer than all four sides.
6. Wrap and staple your fabric.
8. Place your DIY window seat cushion and enjoy!

What fabric is used for window seats?

Upholstery fabric (or heavy-duty non-stretch material). We use and recommend JOANN Fabrics.

What is the best foam for a window seat?

3" thick high-density upholstery foam

How do you measure a window seat cushion?

Measure your window seat space width inside of the window from edge to edge. Then, measure the depth. Subtract 1" from width and depth so that the final DIY window seat cushion can easily move in and out of the window space.

How do you measure fabric for a window seat?

The fabric should be at least 7" to 8" longer than all four sides of a window seat, you that you can wrap it around foam and plywood, plus have extra material to staple into the plywood.

Make Your DIY Window Seat Cushion for a Bay Window

diy window seat cushion

Quick & Easy DIY Window Seat Cushion for a Bay Window (No Sew)

Yield: 1
Prep Time: 30 minutes
Active Time: 30 minutes
Total Time: 1 hour
Difficulty: Easy

This tutorial for a DIY window seat cushion: quick, easy, cheap, and requires NO sewing. ANYONE can do it for about $30 in less than 1 hour.

Materials

  • ½" thick plywood cut to fit size needed (Home Depot or Lowe's will cut it to size for you)
  • 3" thick high-density upholstery foam
  • upholstery fabric (or heavy-duty non-stretch material) (We use and recommend JOANN Fabrics).
  • staples (⅜" or ½" depending on thickness of fabric)
  • spray adhesive (optional)

Tools

  • scissors
  • electric knife (or sharp knife)
  • staple gun
  • permanent marker
  • tape measure (or ruler)
  • power saw or hand saw (if plywood is not already cut for you)
  • hammer
  • heavy-duty staple remover (optional; in case you make a mistake)

Instructions

    1. Measure your space. Measure your window seat space width inside of the window from edge to edge with a tape measure or ruler. Then, measure the depth. Subtract 1" from width and depth so that the final DIY window seat cushion can easily move in and out of the window space. These are your final measurements.
    2. Cut your plywood. Measure, mark with permanent marker, and cut plywood with your power saw or hand saw per your final measurements (or have Home Depot or Lowe's cut it for you). Make sure it has a straight edge!
    3. Cut your upholstery foam. Measure, mark with permanent marker, and cut foam with an electric knife (or sharp knife) per your final measurements.
    4. Place your fabric, foam and plywood. Lay out your upholstery fabric on a floor or flat surface so that it faces down and is straight. Place the foam in the center of the fabric. Make sure the foam is straight, so that any pattern on the fabric appears straight as well. Place the plywood on top of the foam. If you choose, you can add some spray adhesive to the plywood before you place it to ensure it remains aligned with the foam.
    5. Cut your fabric. Trim your fabric at least 7" to 8" longer than all four sides. Then, cut the four corners off the fabric, about 2". This step helps remove excess fabric so that your fabric lays more flush when the cushion is complete.
    6. Wrap and staple your fabric. Start by wrapping your fabric around the upholstery foam and plywood on the long sides. The fabric should be tight, but not too tight, as excessive tightness will create creases in the fabric. Staple at the center on each side with the staples, then staple outward at approximately 3" intervals until you reach the ends of the plywood. Then, wrap the fabric around the foam and plywood on the short sides, as if you were wrapping a present. Secure both sides with more staples. Hammer each staple to ensure they are tight and flush.
    7. Place your DIY window seat cushion and enjoy! Turn your bay window seat cushion over and check your finished product. Place it in your space. If you choose, add home decor items like a throw pillow, blanket, and books (of course). Enjoy your new window seat!
    diy window seat cushion for cat

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