Back Yard Office/Shed

Looking forward to doing a few custom back yard office sheds! Here is one I found online that a designer created. Simple, functional design. From what I've found it is possible to do one of these in Ventura County as long as it is under 120 sq ft, no higher than 8'6, non habitable, (not suppose to have a bed) and meets set back requirements. Power is not allowed to it unless you can get a permit. This should be easy to do solar, 2 exterior solar lights and 1 battery or solar interior light.