A co-worker built a wood shed out of pallets. Not just pallets but the wood from pallets. He did a wonderful job but the labor to take the pallets apart and plane them etc................:rofl2:
Around here if the roof is less than 120 sq ft there is no code.
For a rental property maybe you could put it on wheels and license it as a trailer?:hmmm:
I read about in the neighboring town that a guy built a cement boat and licensed it in his back yard.