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Quick and Easy No Sew Box Style Window Valance

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How to make a no sew box style window valance using foam and fabric. No power tools needed

Finally after all the hard work I have been doing in my hall bathroom, I have been rewarded – it is all coming together just as I had envisioned, I even got an easy no sew window valance made for the window in the room.  No snafus or problems.  Yes!  I love it when that happens – which usually is NEVER – as in DIY decorating land there is always a glitch.  I have seen more than my share of them – this room is the exception.

I am so excited to be actually showing you the icing on the cake – no more construction photos. Now I get to show you the fun, pretty, and colorful stuff like the

My Quick and Easy No Sew Window Valance

It only took me an hour to make. I have made a few of them in the past, so I can get one completed pretty quickly since I know what I am doing.  I made one of these Polystyrene Valances as a project in my book. This is an updated version.  I didn’t use batting, only a liner fabric to soften the edges of the valance.  It is very lightweight not at all heavy like a wood valance.


I made the green valance you see here from cardboard.



All updated!!!  I love it.  I showed you how I added the wood panel and molding above the wimpy window in my last post.  It really made a huge difference in how the window looks now.


How to Make an Easy No Sew Window Cornice or Valance Using Panel Foam

To make the valance I used one Polystyrene Insulation  panel that I got at Lowes. They sell the package of them in the Building Supply area. They are wrapped in clear plastic.   You get 6 – 13” x 48” pieces for about $10.  You can make one for every room, your best friend, your mom… it is so easy to make and install you will be wanting to make them for everybody.


supplies needed:

  • Polystyrene Panels – home improvement store
  • Hot Glue Gun and Glue Sticks
  • Straight Pins or T-Pins
  • T-Square or straight edge (yardstick)
  • Craft Knife
  • Decorative Fabric
  • White Fabric or Quilt Batting
  • Hammer 

1.  Determine the height of your valance. Mine is 12” high.  The width is determined by the width of your window (outside molding to outside molding) measurement.  Add 1- 1/2” to that width measurement.   This will be your front piece.  Cut a board to that size using a T-square or straight edge and a craft knife.

Make sure the blade is sharp and use an up and down motion as you cut instead of one long gliding motion. This will help keep the Polystyrene edge sharper and less little pieces of Polystyrene all over the place.

2. You will need three pieces – front and two sides. My side pieces were 2” deep and 12” high.


3.  Attach the side pieces to the back edge along each side of the front piece. Use hot glue. I know hot glue melts the Polystyrene, but only a little and it really doesn’t matter as you are not going to see it.  If you have a cool melt gun then you can use that.

My motto – What you can’t see can easily be faked!


4. For added support – push a few straight pins in the front along the edge that will go through the side pieces. I used 3 – top, middle, and bottom on each side.


5.  Your valance should look like this now.


6.  Cut your fabric and lining large enough so that you have enough to wrap around to the back of the valance.  Place the decorative fabric right side down and then the lining on top of that.  Then place the valance – front side down onto the fabric. Make sure pattern is straight and then wrap excess fabric to the back of the panel. Pull taut and use straight pins to attach to the valance.  The straight pins need to go in on an angle so they don’t go through the front of the valance.   Work your way around the valance attaching the fabric with pins. Leave the sides alone for now.


They will look like this when pushed all the way in on an angle.


7.  For the sides and corners –pull the side fabric up and around and attach with pins.


Fold and/or tuck the excess in.


8.  Tuck the corner fabric in and then fold over the excess and attach with pins. Pretend you are wrapping a gift.  Pull excess fabric to the back to keep the front and edge smooth.

It will end up looking like this.  Re-pin if necessary to keep the fabric taut around the valance.  I found my pretty beaded pins at the dollar store.


9. If you have a very long window you can brace the back of the valance with another piece of Polystyrene. Use hot glue to attach.  Wait to add this piece after you have the fabric on.  If you put it on before – the side fabric wrapping is harder to do.


I use straight, bank, or T pins for so many projects. They are one of the basic items I used when I worked in display and they are my go-to for easy adhering and attaching.  To attach the valance to the window I used the straight pins you see below.

T-Pins sizes I use: 1-1/2″ and 2″ long pins


10. To attach the valance to the wall you will need an extra set of hands.  “Honey, I need you xo” Once you have your helper hands – position the valance where you want it and use a straight pin to attach the valance to the edge of the window molding.  Right into the valance and  side of the window molding.  Repeat on other side.   Bye, honey I don’t need you anymore- xo.”  You can add an extra pin or two to each side to secure.  (No molding around your window?  See instructions at the end of this post.)


All done!  My valance cost me under $10 as I found the fun fabric for $6 a yard.  I had the lining fabric and the Polystyrene from another project.


This bathroom makeover all started when I found the brown and white damask print shower curtain at HomeGoods.   I loved it and it was only $14.99 so I went home with it.  It has been sitting in its package for weeks!  I got it out this morning and had to steam it to get all folded wrinkles out.  – Not a glitch , but ironing is not my idea of a good time.

How-to-make-a-no-sew-window treatment

Here is the name of the fabric I used for the valance.


How to Mount the Valance when you don’t have molding around your Window

You will need a 2 – inch  “L” bracket, 2 screws, and 2 brass fasteners for each side.  Note when figuring out the measurement for how wide your valance should be.  Add 4″ inches to the total measurement 2″ inches for each L bracket. you should mount them on the wall first and then figure out the width the valance should be.

Figure out where on the wall your valance is going to go.  Place the L bracket where the center of the valance will be.  Screw the L bracket into the wall as shown below with 2 screws.  Once the L bracket is in place hold up the valance against it and push a brass fastener through the holes and then spread them open. Repeat on the other side.  You can paint the heads of the brass fasteners the color of your fabric to hide them.

Note: This photo shows the L bracket  at the bottom of the valance but that is just to show you how to mount it.  It should be centered in the valance.

How to make a no sew window valance using foam insulation

If you would like to know how to:

Make a No-sew window valance using cardboard – click – here.

Make a wimpy window look bigger –click – here.

I have lots more to show you in this bathroom makeover – accessories, floor, and a few more details.  So much to do – so little time.  :)

I am working on the floor – it is coming out better than I expected. I will post about that next time.


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  1. I love your new cornice board..looks really nice.
    I am thinking now about doing one for MY bath. :))
    I was trying to see if, with all your remodeling, you kept that amazing floor…?
    xo bj

    1. Hi Bj – Thanks – The floor is in great shape, but those little squares are green and don’t go with the new colors. I am working on a fix and will post it in my next post.

  2. Diane…..I am all for the no sew projects! I too made a beautiful cornice board for my dining room but used pink core insulation board from Home Depot ($8). It worked perfectly and looks just gorgeous!

    1. Hi Susan –
      Thanks for sharing. any of the foam insulation boards will work. It is all basically the same stuff . A plus for the pink or blue foam boards is less pebbleing and little pieces of foam getting everywhere. A plus for the white foam boards is they are white and are better to use if you have a light colored fabric.

  3. This is great! I cannot sew at all so it’s right up my alley. Thanks for the tutorial! And your fabric choice is great!

    1. Hi Colleen-

      Thanks – The found the fabric at my fav dollar a yard fabric store .I only bought one yard – wish I had gotten more. I have a scrap leftover and will probably end up using it for some detail in the room.

  4. absolutely brilliant!!!
    love this – thanks so much for sharing online.
    (love your blog and all your hints as well!)
    cheryl xox.

    1. Hi Cheryl-
      Thanks so much. I love easy, quick, and inexpensive decorating ideas and projects. Why spend tons of time and money on some things when you can make them yourself at a fraction of the cost. I was the kid who always picked up things in stores and would say – “that is so easy to make” and then I would go home and try. I enjoy the challenge of asking “What If ?”

    1. I’m inspired to make a video myself about making an easily removable cornice, if the buyers don’t like the ones I made. I figured out how to sew the cornice to the existing top trim of the vertical blinds there. I drilled holes every two feet and then when my styrofoam was covered with batting and material, it was still light weight to hang from the existing top frame that was just a plain piece of plastic, or whatever it is. If somebody wants to change the material, or get rid of it, all they have to do is cut the thick thread attaching it to the trim strip up there. I bougjht 3 more of those clips that held that on, to be stronger for the extra weight. A total of 10 inches wide with the batting and twisted chord is big enough so not to look so overbearing above the huge sliding glass doors. It accomplished covering the top metal part of the sliding glass doors, which I hated. Dot Flanigan

      1. Hi Dot – Thanks for sharing what you did to make your removable cornice fit over top of the vertical blinds. I love to see ingenuity in DIY. :-)