We bought two of them during the pandemic! One is my office and the other is my wife’s music studio; they’re about 12’x16’ each, with a storage loft above the door. The company we bought them from in NC has a website that lets you design the layout, add windows, etc., and then you can have it unfinished (for a workshop) or finished with insulation and electrical. They construct them offsite and then deliver them to your property—all told they’re on the order of $10-15k each depending on options chosen, and then you’ll need to arrange a gravel pad for them, electrical hookups, etc. Not bad, especially financed, and cheaper than an addition on the house. :)