Jill probably paid the absolute minimum for the addition since Hunk can do the rest. In my area Amish crews build a lot of stables and indoor arenas. The work is top notch. It is not cheap. You get what you pay for.
The addition looks like a barn. Maybe the Amish workers missed the "do" in barndo and just built a cow shed.
As an artist, I would love to find a barndo in the country side. Lots of work and studio space. There are only 2, sometimes 3, of us. We wouldn't have to turn it into a warren of rickety rooms. It would be a nice home.