I read your first post again. A shop on rural acreage is a shop, it is not a residence so it cannot be covered under a residential policy. When you build your home on the same acreage, then you can call it an accessory building, detached garage etc., and it will be covered as such. I have a 10 x 12 shed with permitted electricity that I store everything in next to the house here. USAA would laugh at me if I called them and said I wanted to insure it as a small 2nd residence. If it was 100' x 120' it would still be an accessory building. If the zoning allowed 2 on 1, and it was built to code with kitchen, bath, bedrooms, etc., as a second house on the lot, then I could ask for it to be insured as a second home - granny flat etc.. Once I tell them by the way I store gasoline in it, do welding, run saws, build cabinets, work on tractors in it too, or they see it from an overhead shot, they are going to have a problem with what I am telling them it is. Don't forget that in this day and age, they can see any property they want from Google Earth, or drones they can fly to take photos. Also, not all the insurance USAA offers is USAA. Some of it is brokered where another company underwrites it, and USAA collects premiums for the convenience of the policy holder.