How can I make a wooden curtain valence?

You want to upholster it or have it be exposed wood?

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Hi there, perhaps this post will help! https://www.hometalk.com/diy/build/doors-windows/diy-wood-window-valances-15255127

DIY Wood Window Valances

You need to measure how long you want and how far out from the wall you want. Then cut 2 2x4 or 2x6 pieces to go across the top and the front. Then cut two for the measurement for how far out from the wall you want. These will be your end caps. Attach to your wall with L brackets. You can now attach your curtains to the valance box or the wall. The ones I made for our Kitchen were painted the same color as our cabinets. The ones for the Living room I covered in batting and fabric to match my curtains. I hope I made sense with this. They are really easy