I built one of our coops using reclaimed pallet wood, an old window, and cupboard doors someone was tossing out. I did have to buy the metal roofing but the whole thing only cost about $50 and I was able to make it with very minimal skills and my two young kids helping. I lined the inside with feed bags to make clean out easier and let my kiddos paint it with cheap "oops" paint.
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Wonderful how a coat of paint brings everything together.