Long story short, my enclosed carport was placed on the property line of my neighbor. I'm about 3 feet over the line, and was wondering if moving my building 10 feet to the left is possible? My concrete guy said there will be no problem pouring into the slab to extend it. I I would like to keep it intact because it's already spray foamed. Is this something that can be easily done or should I just fork over 15k to my neighbor for 20ft of their property.
Sure it can be moved. And IMO, not with much difficulty. Pour the extension and let it cure for at least a week. Unbolt the building from the slab. Brace the door openings well. I suggest some of the same tubing used in the frame. weld to the frame, good tacks are enough. These can be cut loose with a grinder after moving and the weld damage coated with 'cold galvanizing'.
Create lifting 'ledges' or front to back wall connection on the interior walls. Either weld more of the tubing to the uprights or bolt 2x lumber in place to allow jacking.
buy or borrow some cheap bottle jacks. You only need to raise it a few inches. insert pipe pieces under the bottom of the walls. lower building onto the pipe. Pull 3 feet with come-a-longs. Raise with jacks, remove pipe. Drill anchor holes. Insert anchors, remove bracing etc.
calculate your costs vs the cost of the land. Your decision.